

<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.capnia.com/20151231" xmlns:capn="http://www.capnia.com/20151231" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:import namespace="http://fasb.org/us-gaap/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-roles-2016-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-types-2016-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2016-01-31" schemaLocation="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/currency/2016-01-31" schemaLocation="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/exch/2016-01-31" schemaLocation="http://xbrl.sec.gov/exch/2016/exch-2016-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="capn-20151231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="capn-20151231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="capn-20151231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="capn-20151231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:roleType id="CapitalStock" roleURI="http://www.capnia.com/role/CapitalStock">
        <link:definition>2110100 - Disclosure - Capital Stock</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CapitalStockAdditionalInformationDetail" roleURI="http://www.capnia.com/role/CapitalStockAdditionalInformationDetail">
        <link:definition>2410401 - Disclosure - Capital Stock - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingencies" roleURI="http://www.capnia.com/role/CommitmentsAndContingencies">
        <link:definition>2109100 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesAdditionalInformationDetails" roleURI="http://www.capnia.com/role/CommitmentsAndContingenciesAdditionalInformationDetails">
        <link:definition>2409402 - Disclosure - Commitments and Contingencies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesMinimumRentalPaymentsDetails" roleURI="http://www.capnia.com/role/CommitmentsAndContingenciesMinimumRentalPaymentsDetails">
        <link:definition>2409403 - Disclosure - Commitments and Contingencies - Minimum Rental Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesTables" roleURI="http://www.capnia.com/role/CommitmentsAndContingenciesTables">
        <link:definition>2309301 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.capnia.com/role/ConsolidatedBalanceSheets">
        <link:definition>1001000 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.capnia.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>1001501 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfCashFlows" roleURI="http://www.capnia.com/role/ConsolidatedStatementsOfCashFlows">
        <link:definition>1004000 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfOperations" roleURI="http://www.capnia.com/role/ConsolidatedStatementsOfOperations">
        <link:definition>1002000 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CreditFacility" roleURI="http://www.capnia.com/role/CreditFacility">
        <link:definition>2108100 - Disclosure - Credit Facility</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CreditFacilityAdditionalInformationDetails" roleURI="http://www.capnia.com/role/CreditFacilityAdditionalInformationDetails">
        <link:definition>2408401 - Disclosure - Credit Facility - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DefinedContributionPlan" roleURI="http://www.capnia.com/role/DefinedContributionPlan">
        <link:definition>2114100 - Disclosure - Defined Contribution Plan</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DescriptionOfBusiness" roleURI="http://www.capnia.com/role/DescriptionOfBusiness">
        <link:definition>2101100 - Disclosure - Description of Business</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DescriptionOfBusinessAdditionalInformationDetail" roleURI="http://www.capnia.com/role/DescriptionOfBusinessAdditionalInformationDetail">
        <link:definition>2401401 - Disclosure - Description of Business - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DocumentAndEntityInformation" roleURI="http://www.capnia.com/role/DocumentAndEntityInformation">
        <link:definition>0001000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueOfFinancialInstruments" roleURI="http://www.capnia.com/role/FairValueOfFinancialInstruments">
        <link:definition>2104100 - Disclosure - Fair Value of Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueOfFinancialInstrumentsSummaryOfChangesInFairValueOfLevel1AndLevel3FinancialInstrumentsDetails" roleURI="http://www.capnia.com/role/FairValueOfFinancialInstrumentsSummaryOfChangesInFairValueOfLevel1AndLevel3FinancialInstrumentsDetails">
        <link:definition>2404403 - Disclosure - Fair Value of Financial Instruments - Summary of Changes in Fair Value of Level1 and Level 3 Financial Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueOfFinancialInstrumentsSummaryOfFinancialInstrumentsMeasuredAtFairValueOnRecurringBasisDetails" roleURI="http://www.capnia.com/role/FairValueOfFinancialInstrumentsSummaryOfFinancialInstrumentsMeasuredAtFairValueOnRecurringBasisDetails">
        <link:definition>2404402 - Disclosure - Fair Value of Financial Instruments - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueOfFinancialInstrumentsTables" roleURI="http://www.capnia.com/role/FairValueOfFinancialInstrumentsTables">
        <link:definition>2304301 - Disclosure - Fair Value of Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.capnia.com/role/IncomeTaxes">
        <link:definition>2111100 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesAdditionalInformationDetail" roleURI="http://www.capnia.com/role/IncomeTaxesAdditionalInformationDetail">
        <link:definition>2411402 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesReconciliationOfIncomeTaxExpenseByApplyingStatutoryUSFederalIncomeTaxRateToIncomeBeforeIncomeTaxesDetail" roleURI="http://www.capnia.com/role/IncomeTaxesReconciliationOfIncomeTaxExpenseByApplyingStatutoryUSFederalIncomeTaxRateToIncomeBeforeIncomeTaxesDetail">
        <link:definition>2411403 - Disclosure - Income Taxes - Reconciliation of Income Tax Expense by Applying Statutory U.S. Federal Income Tax Rate to Income Before Income Taxes (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesSignificantComponentsOfCompanysDeferredTaxAssetsAndLiabilitiesDetail" roleURI="http://www.capnia.com/role/IncomeTaxesSignificantComponentsOfCompanysDeferredTaxAssetsAndLiabilitiesDetail">
        <link:definition>2411404 - Disclosure - Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesSummaryOfGrossUnrecognizedTaxBenefitsDetail" roleURI="http://www.capnia.com/role/IncomeTaxesSummaryOfGrossUnrecognizedTaxBenefitsDetail">
        <link:definition>2411405 - Disclosure - Income Taxes - Summary of Gross Unrecognized Tax Benefits (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://www.capnia.com/role/IncomeTaxesTables">
        <link:definition>2311301 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LiquidityFinancialConditionAndManagementsPlans" roleURI="http://www.capnia.com/role/LiquidityFinancialConditionAndManagementsPlans">
        <link:definition>2102100 - Disclosure - Liquidity, Financial Condition and Management's Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LiquidityFinancialConditionAndManagementsPlansAdditionalInformationDetail" roleURI="http://www.capnia.com/role/LiquidityFinancialConditionAndManagementsPlansAdditionalInformationDetail">
        <link:definition>2402401 - Disclosure - Liquidity, Financial Condition and Management's Plans - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NeoforceGroupIncAcquisition" roleURI="http://www.capnia.com/role/NeoforceGroupIncAcquisition">
        <link:definition>2113100 - Disclosure - NeoForce Group, Inc. Acquisition</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NeoforceGroupIncAcquisitionAdditionalInformationDetail" roleURI="http://www.capnia.com/role/NeoforceGroupIncAcquisitionAdditionalInformationDetail">
        <link:definition>2413402 - Disclosure - NeoForce Group, Inc. Acquisition - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NeoforceGroupIncAcquisitionFairValuesOfAssetsAcquiredDetail" roleURI="http://www.capnia.com/role/NeoforceGroupIncAcquisitionFairValuesOfAssetsAcquiredDetail">
        <link:definition>2413404 - Disclosure - NeoForce Group, Inc. Acquisition - Fair Values of Assets Acquired (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NeoforceGroupIncAcquisitionScheduleOfAggregatePurchasePriceConsiderationDetail" roleURI="http://www.capnia.com/role/NeoforceGroupIncAcquisitionScheduleOfAggregatePurchasePriceConsiderationDetail">
        <link:definition>2413403 - Disclosure - NeoForce Group, Inc. Acquisition - Schedule of Aggregate Purchase Price Consideration (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NeoforceGroupIncAcquisitionScheduleOfUnauditedProFormaFinancialInformationDetail" roleURI="http://www.capnia.com/role/NeoforceGroupIncAcquisitionScheduleOfUnauditedProFormaFinancialInformationDetail">
        <link:definition>2413405 - Disclosure - NeoForce Group, Inc. Acquisition - Schedule of Unaudited Pro Forma Financial Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NeoforceGroupIncAcquisitionTables" roleURI="http://www.capnia.com/role/NeoforceGroupIncAcquisitionTables">
        <link:definition>2313301 - Disclosure - NeoForce Group, Inc. Acquisition (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShare" roleURI="http://www.capnia.com/role/NetLossPerShare">
        <link:definition>2112100 - Disclosure - Net loss per share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShareScheduleOfPotentiallyDilutiveSecuritiesOutstandingExcludedFromComputationsOfDilutedWeightedAverageSharesOutstandingDetail" roleURI="http://www.capnia.com/role/NetLossPerShareScheduleOfPotentiallyDilutiveSecuritiesOutstandingExcludedFromComputationsOfDilutedWeightedAverageSharesOutstandingDetail">
        <link:definition>2412402 - Disclosure - Net loss per share - Schedule of Potentially Dilutive Securities Outstanding Excluded from Computations of Diluted Weighted-Average Shares Outstanding (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShareTables" roleURI="http://www.capnia.com/role/NetLossPerShareTables">
        <link:definition>2312301 - Disclosure - Net loss per share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipmentNet" roleURI="http://www.capnia.com/role/PropertyAndEquipmentNet">
        <link:definition>2105100 - Disclosure - Property and Equipment, Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipmentNetAdditionalInformationDetail" roleURI="http://www.capnia.com/role/PropertyAndEquipmentNetAdditionalInformationDetail">
        <link:definition>2405403 - Disclosure - Property and Equipment, Net - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipmentNetScheduleOfPropertyAndEquipmentDetail" roleURI="http://www.capnia.com/role/PropertyAndEquipmentNetScheduleOfPropertyAndEquipmentDetail">
        <link:definition>2405402 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAndEquipmentNetTables" roleURI="http://www.capnia.com/role/PropertyAndEquipmentNetTables">
        <link:definition>2305301 - Disclosure - Property and Equipment, Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementsOfConvertiblePreferredStockAndStockholdersEquityDeficit" roleURI="http://www.capnia.com/role/StatementsOfConvertiblePreferredStockAndStockholdersEquityDeficit">
        <link:definition>1003000 - Statement - Statements of Convertible Preferred Stock and Stockholders' Equity/(Deficit)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementsOfConvertiblePreferredStockAndStockholdersEquityDeficitParenthetical" roleURI="http://www.capnia.com/role/StatementsOfConvertiblePreferredStockAndStockholdersEquityDeficitParenthetical">
        <link:definition>1003501 - Statement - Statements of Convertible Preferred Stock and Stockholders' Equity/(Deficit) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityDeficit" roleURI="http://www.capnia.com/role/StockholdersEquityDeficit">
        <link:definition>2110100 - Disclosure - Stockholders' Equity (Deficit)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityDeficitAdditionalInformationDetail" roleURI="http://www.capnia.com/role/StockholdersEquityDeficitAdditionalInformationDetail">
        <link:definition>2410402 - Disclosure - Stockholders' Equity (Deficit) - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityDeficitScheduleOfFairValueOfAwardGrantedUsingBlackScholesOptionPricingModelDetail" roleURI="http://www.capnia.com/role/StockholdersEquityDeficitScheduleOfFairValueOfAwardGrantedUsingBlackScholesOptionPricingModelDetail">
        <link:definition>2410404 - Disclosure - Stockholders' Equity (Deficit) - Schedule of Fair Value of Award Granted Using Black-Scholes Option Pricing Model (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityDeficitSummaryOfStockBasedCompensationExpenseDetail" roleURI="http://www.capnia.com/role/StockholdersEquityDeficitSummaryOfStockBasedCompensationExpenseDetail">
        <link:definition>2410403 - Disclosure - Stockholders' Equity (Deficit) - Summary of Stock Based Compensation Expense (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityDeficitSummaryOfStockOptionTransactionsDetail" roleURI="http://www.capnia.com/role/StockholdersEquityDeficitSummaryOfStockOptionTransactionsDetail">
        <link:definition>2410405 - Disclosure - Stockholders' Equity (Deficit) - Summary of Stock Option Transactions (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityDeficitTables" roleURI="http://www.capnia.com/role/StockholdersEquityDeficitTables">
        <link:definition>2310301 - Disclosure - Stockholders' Equity (Deficit) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEvents" roleURI="http://www.capnia.com/role/SubsequentEvents">
        <link:definition>2114100 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEventsAdditionalInformationDetail" roleURI="http://www.capnia.com/role/SubsequentEventsAdditionalInformationDetail">
        <link:definition>2414401 - Disclosure - Subsequent Events - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPolicies" roleURI="http://www.capnia.com/role/SummaryOfSignificantAccountingPolicies">
        <link:definition>2103100 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" roleURI="http://www.capnia.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail">
        <link:definition>2403403 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesFutureAmortizationExpenseDetails" roleURI="http://www.capnia.com/role/SummaryOfSignificantAccountingPoliciesFutureAmortizationExpenseDetails">
        <link:definition>2403405 - Disclosure - Summary of Significant Accounting Policies - Future Amortization Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesIntangibleAssetsDetails" roleURI="http://www.capnia.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsDetails">
        <link:definition>2403404 - Disclosure - Summary of Significant Accounting Policies - Intangible Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesPolicies" roleURI="http://www.capnia.com/role/SummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>2203201 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesTables" roleURI="http://www.capnia.com/role/SummaryOfSignificantAccountingPoliciesTables">
        <link:definition>2303302 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WarrantLiabilities" roleURI="http://www.capnia.com/role/WarrantLiabilities">
        <link:definition>2106100 - Disclosure - Warrant Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WarrantLiabilitiesAdditionalInformationDetail" roleURI="http://www.capnia.com/role/WarrantLiabilitiesAdditionalInformationDetail">
        <link:definition>2406402 - Disclosure - Warrant Liabilities - Additional Information (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WarrantLiabilitiesFairValueOfConvertiblePreferredStockWarrantLiabilityDetail" roleURI="http://www.capnia.com/role/WarrantLiabilitiesFairValueOfConvertiblePreferredStockWarrantLiabilityDetail">
        <link:definition>2406403 - Disclosure - Warrant Liabilities - Fair Value of Convertible Preferred Stock Warrant Liability (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="WarrantLiabilitiesTables" roleURI="http://www.capnia.com/role/WarrantLiabilitiesTables">
        <link:definition>2306301 - Disclosure - Warrant Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element abstract="true" id="capn_AccruedCompensationAndOtherCurrentLiabilitiesMember" name="AccruedCompensationAndOtherCurrentLiabilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_AdditionalOperatingLeaseOfficeSpace" name="AdditionalOperatingLeaseOfficeSpace" nillable="true" substitutionGroup="xbrli:item" type="num:areaItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_AdjustmentstoAdditionalPaidinCapitalDerecognitionofWarrantLiabilityUponExercise" name="AdjustmentstoAdditionalPaidinCapitalDerecognitionofWarrantLiabilityUponExercise" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="capn_AdjustmentstoAdditionalPaidinCapitalStockIssuedDeferredIssuanceCosts" name="AdjustmentstoAdditionalPaidinCapitalStockIssuedDeferredIssuanceCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_AdjustmentstoAdditionalPaidinCapitalWarrantsContributed" name="AdjustmentstoAdditionalPaidinCapitalWarrantsContributed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_AspireCapitalFundLlcMember" name="AspireCapitalFundLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_BusinessAcquisitionContingentConsiderationTransferredFairValue" name="BusinessAcquisitionContingentConsiderationTransferredFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="capn_BusinessAcquisitionProFormaNetIncomeLossPerShareBasicAndDiluted" name="BusinessAcquisitionProFormaNetIncomeLossPerShareBasicAndDiluted" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_BusinessAcquisitionProformaWeightedAverageSharesBasicAndDiluted" name="BusinessAcquisitionProformaWeightedAverageSharesBasicAndDiluted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_BusinessCombinationConsiderationTransferredContingentConsiderationAccrued" name="BusinessCombinationConsiderationTransferredContingentConsiderationAccrued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="capn_BusinessCombinationConsiderationTransferredFairValueOfRoyalty" name="BusinessCombinationConsiderationTransferredFairValueOfRoyalty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="capn_BusinessCombinationRecognizedIdentifiableTangibleAssetsAcquiredAndLiabilitiesAssumedNet" name="BusinessCombinationRecognizedIdentifiableTangibleAssetsAcquiredAndLiabilitiesAssumedNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_CapitalContributionsMember" name="CapitalContributionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_CapitalStockNumberofSharesPerUnit" name="CapitalStockNumberofSharesPerUnit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_CashExerciseMember" name="CashExerciseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_CashlessExerciseMember" name="CashlessExerciseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_CashlessWarrantsExercised" name="CashlessWarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ClassOfWarrantOrRightWarrantTerm" name="ClassOfWarrantOrRightWarrantTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ClassofWarrantOrRightLiquidatedDamagesAmountPercentofVolumeWeightedAveragePrice" name="ClassofWarrantOrRightLiquidatedDamagesAmountPercentofVolumeWeightedAveragePrice" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ClassofWarrantorRightExpirationsinPeriod" name="ClassofWarrantorRightExpirationsinPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ClassofWarrantorRightNumberofWarrantsIssued" name="ClassofWarrantorRightNumberofWarrantsIssued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="capn_CommonStockPurchaseAgreementAgreementTerm" name="CommonStockPurchaseAgreementAgreementTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_CommonStockVotingRightsNumberofVotesPerShare" name="CommonStockVotingRightsNumberofVotesPerShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_CommonStockWarrantLiabilityMember" name="CommonStockWarrantLiabilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ConcentrationRiskCreditRiskNumberofBanks" name="ConcentrationRiskCreditRiskNumberofBanks" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="capn_ContributionofWarrants" name="ContributionofWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_DerecognitionOfWarrantDerivativeLiability" name="DerecognitionOfWarrantDerivativeLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_DescriptionOfBusinessLineItems" name="DescriptionOfBusinessLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_DescriptionOfBusinessTable" name="DescriptionOfBusinessTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_DiscountAndCommissionOnIssuanceOfShares" name="DiscountAndCommissionOnIssuanceOfShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveandThereafter" name="FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveandThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_IncentiveStockOptionsMember" name="IncentiveStockOptionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_IncomeTaxReconciliationChangeInFairValueOfWarrants" name="IncomeTaxReconciliationChangeInFairValueOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_IncreaseDecreaseInCommonStockMarketPrice" name="IncreaseDecreaseInCommonStockMarketPrice" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_InitialPublicOfferingCostsIncludedInAccountsPayable" name="InitialPublicOfferingCostsIncludedInAccountsPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_IssuanceOfWarrantsInConnectionWithNotesPayable" name="IssuanceOfWarrantsInConnectionWithNotesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_IvylandPennsylvaniaMember" name="IvylandPennsylvaniaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_LesseeLeasingArrangementsOperatingLeasesIncreasestoMonthlyPaymentsTerm" name="LesseeLeasingArrangementsOperatingLeasesIncreasestoMonthlyPaymentsTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_LiquidityAndManagementsPlansLineItems" name="LiquidityAndManagementsPlansLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_LiquidityAndManagementsPlansTable" name="LiquidityAndManagementsPlansTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_LongTermPurchaseCommitmentAmountInitialPayment" name="LongTermPurchaseCommitmentAmountInitialPayment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_LongTermPurchaseCommitmentRemainingAmountPayable" name="LongTermPurchaseCommitmentRemainingAmountPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_MaximGroupLlcMember" name="MaximGroupLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_MaximumValueOfSharesForIssuanceUnderSecuritiesPurchaseAgreement" name="MaximumValueOfSharesForIssuanceUnderSecuritiesPurchaseAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_NeoForceGroupIncMember" name="NeoForceGroupIncMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_NeoForceIncMember" name="NeoForceIncMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_NonQualifiedStockOptionsMember" name="NonQualifiedStockOptionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_NoncashExpenseOnSharesIssued" name="NoncashExpenseOnSharesIssued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_NoncashTransactionExerciseofWarrants" name="NoncashTransactionExerciseofWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_NumberofFundsManaged" name="NumberofFundsManaged" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="capn_OperatingLeaseOfficeSpace" name="OperatingLeaseOfficeSpace" nillable="true" substitutionGroup="xbrli:item" type="num:areaItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_OwnershipInterestPercentageofVotingRightsofStock" name="OwnershipInterestPercentageofVotingRightsofStock" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_PatentsAndTrademarkMember" name="PatentsAndTrademarkMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock" name="PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_PrivatePlacementSeriesBWarrantsMember" name="PrivatePlacementSeriesBWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodOne" name="RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodOne" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodThree" name="RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodThree" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodTwo" name="RoyaltyGuaranteesCommitmentsPaymentIntervalPeriodTwo" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_RoyaltyPaymentPeriod" name="RoyaltyPaymentPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SabbyManagementLlcMember" name="SabbyManagementLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_ScheduleOfSignificantAccountingPoliciesLineItems" name="ScheduleOfSignificantAccountingPoliciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_ScheduleOfSignificantAccountingPoliciesTable" name="ScheduleOfSignificantAccountingPoliciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_SecurityPurchaseAgreementNumberofClosings" name="SecurityPurchaseAgreementNumberofClosings" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesAConvertiblePreferredStockMember" name="SeriesAConvertiblePreferredStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesAWarrantsMember" name="SeriesAWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesAWarrantsToPurchaseCommonStockMember" name="SeriesAWarrantsToPurchaseCommonStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesBWarrantCashlessExercisesMember" name="SeriesBWarrantCashlessExercisesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesBWarrantToPurchaseCommonStockMember" name="SeriesBWarrantToPurchaseCommonStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesBWarrantsMember" name="SeriesBWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesCWarrantToPurchaseCommonStockMember" name="SeriesCWarrantToPurchaseCommonStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesCWarrantsMember" name="SeriesCWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesDWarrantToPurchaseCommonStockMember" name="SeriesDWarrantToPurchaseCommonStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesDWarrantsMember" name="SeriesDWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SeriesaAndSeriesbWarrantsMember" name="SeriesaAndSeriesbWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExercisedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExercisedInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpired" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExpired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeituresInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeituresInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGranted" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGranted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsVestedinPeriodWeightedAverageRemainingContractualTerm" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsVestedinPeriodWeightedAverageRemainingContractualTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_SharebasedCompensationArrangementbySharebasedPaymentAwardSharesAvailableforGrantRollForward" name="SharebasedCompensationArrangementbySharebasedPaymentAwardSharesAvailableforGrantRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_StockIssuedDuringPeriodSharesCashlessExerciseOfWarrants" name="StockIssuedDuringPeriodSharesCashlessExerciseOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_StockIssuedDuringPeriodSharesExercisedOfWarrants" name="StockIssuedDuringPeriodSharesExercisedOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_StockIssuedDuringPeriodSharesNewIssuesUnderTheAtTheMarketProgram" name="StockIssuedDuringPeriodSharesNewIssuesUnderTheAtTheMarketProgram" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_StockIssuedDuringPeriodValueConversionOfWarrantsDerivativeLiability" name="StockIssuedDuringPeriodValueConversionOfWarrantsDerivativeLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="capn_StockIssuedDuringPeriodValueNewIssuesUnderTheAtTheMarketProgram" name="StockIssuedDuringPeriodValueNewIssuesUnderTheAtTheMarketProgram" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="capn_TemporaryEquitySharesConversionOfConvertibleSecurities" name="TemporaryEquitySharesConversionOfConvertibleSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_TemporaryEquityStatedValuePerShare" name="TemporaryEquityStatedValuePerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element id="capn_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_TemporaryEquityValueConversionOfConvertibleSecurities" name="TemporaryEquityValueConversionOfConvertibleSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_TenderOfferSeriesBWarrantsMember" name="TenderOfferSeriesBWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_TransactionCostsIncludedinAccountsPayable" name="TransactionCostsIncludedinAccountsPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_TwoThousandAndFourteenConvertiblePromissoryNotesMember" name="TwoThousandAndFourteenConvertiblePromissoryNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_TwoThousandAndFourteenPlanMember" name="TwoThousandAndFourteenPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_TwoThousandAndTenAndTwoThousandAndTwelveConvertiblePromissoryNotesMember" name="TwoThousandAndTenAndTwoThousandAndTwelveConvertiblePromissoryNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_TwoThousandAndTenPlanMember" name="TwoThousandAndTenPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="capn_UnderwriterMember" name="UnderwriterMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_UnrecognizedTaxBenefitsOffsetByValuationAllowance" name="UnrecognizedTaxBenefitsOffsetByValuationAllowance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_VariableInterestsAndEquityMethodInvestmentsDisclosureAbstract" name="VariableInterestsAndEquityMethodInvestmentsDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_WarrantLiabilityDisclosureTextBlock" name="WarrantLiabilityDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_WarrantsExercised" name="WarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="capn_WarrantsToPurchaseCommonStockMember" name="WarrantsToPurchaseCommonStockMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="capn_WorkingCapital" name="WorkingCapital" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
</xsd:schema>





