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        <OtherCompensation>12844</OtherCompensation>
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    <IRS990ScheduleM documentId="R000012" softwareId="11000129" softwareVersion="v1.00">
      <SecuritiesPubliclyTraded>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>29</NumberOfContributions>
        <NoncashContribsRptdF990>617855</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Market Value</MethodOfDeterminingRevenues>
      </SecuritiesPubliclyTraded>
      <RealEstateResidential>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>375000</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Appraisal</MethodOfDeterminingRevenues>
      </RealEstateResidential>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Scientific equipment</Description>
        <NumberOfContributions>3</NumberOfContributions>
        <NoncashContribsRptdF990>10493</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Market Value</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <NumberOf8283Received>1</NumberOf8283Received>
      <AnyPropertyThatMustBeHeld>0</AnyPropertyThatMustBeHeld>
      <ReviewProcessUnusualNCGifts>1</ReviewProcessUnusualNCGifts>
      <ThirdPartiesUsed>1</ThirdPartiesUsed>
      <Form990ScheduleMPartII>
        <Identifier>SchM_P01_S00_L32b</Identifier>
        <ReturnReference>Schedule M, Part I, Line 32b</ReturnReference>
        <Explanation>Stock donations are typically received in the MBL's Morgan Stanley Smith Barney account and typically sold as soon as possible by Morgan Stanley Smith Barney.</Explanation>
      </Form990ScheduleMPartII>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="R000013" softwareId="11000129" softwareVersion="v1.00">
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L06</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 6</ReturnReference>
        <Explanation>There are 352 Corporation Members who are nominated by the Science Council and elected at the annual or special meetings by the members and serve until death or resignation. The Corporation Members have limited voting rights regarding changes in the Bylaws. Bylaw amendments, which have been made by the Board, may be amended or repealed by the Members at a properly called meeting. Specifically reserved to the Members is the power to amend the sections of the Bylaws related to removal of Trustees and Bylaw amendments, and any other provisions of the Bylaws (or as required by law or the Articles of Organization) that require action by the Members.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L07a</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 7a</ReturnReference>
        <Explanation>The Corporation Members elect a Chair of the Science Council, who also becomes a member of the governing board.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L07b</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 7b</ReturnReference>
        <Explanation>As described above in the context of Part VI, Section A, Line 6.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L11b</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 11b</ReturnReference>
        <Explanation>Form 990 is prepared by the MBL Staff and reviewed by Grant Thornton LLP, the institutions audit and tax services firm. A draft copy is then submitted to the Audit Committee of the Board of Trustees for a thorough review. A final version is given to all members of the Board of Trustees five (5) days before the filing date.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L12c</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 12c</ReturnReference>
        <Explanation>All employees of the MBL are annually sent the following from Human Resources: a link to the online MBL conflict of interest policy, a memo explaining the need for all employees to fill out the disclosure form, and the disclosure form. Human Resources ensures that all employees return the form by the requested due date. The forms are reviewed and signed by the Human Resources Director. All forms with a potential conflict of interest are reviewed by the MBL President/Director. The Human Resources Director and the President/Director attempt to resolve the conflict with the employee. Failure to comply with the policy may result in dismissal, subject to and in accordance with the terms of any applicable employment agreement. All MBL board members are sent a copy of the Trustee conflict of interest policy and a conflict of interest disclosure form to be filed within 30 days of election to the board and annually thereafter. The disclosure forms are received by the President/Director's office, and forwarded to the Chief Financial Officer. The forms are reviewed for possible conflicts of interest by the Chairman of the Board. If conflicts of interest cannot be resolved or the board member fails to comply with the policy, the board member may be subject to removal by a vote of the board pursuant to the bylaws.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L15</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 15</ReturnReference>
        <Explanation>The President/Director's compensation package for 2011 was determined and approved by the Board of Trustees after review of comparable salaries &amp; benefits in the industry using at least two sources of data. Contemporaneous substantiation of the deliberation and decision is maintained by the institution.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0C_L19</Identifier>
        <ReturnReference>Form 990, Part VI, Section C, Line 19</ReturnReference>
        <Explanation>The governing documents and conflict of interest policy are available on the website. Financial statements are available upon request to the CFO.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P11_S00_L05</Identifier>
        <ReturnReference>Form 990, Part XI, Line 5</ReturnReference>
        <Explanation>Other Changes consists of the following deductions, an unrealized investment loss of $3,383,626, the interest rate swap decrease of $3,369,856 and the periodic pension expense of $176,737 and additions of an increase in the present value Annuities adjustment of $44,522 and the President/Director's housing allowance of $40,000 (W-2 only).</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="R000014" softwareId="11000129" softwareVersion="v1.00">
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>MBL Post Retirement Health Plan</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>7 MBL Street</AddressLine1>
          <City>Woods Hole</City>
          <State>MA</State>
          <ZIPCode>02543</ZIPCode>
        </AddressUS>
        <EIN>043285249</EIN>
        <PrimaryActivities>Post retirement health care benefits</PrimaryActivities>
        <LegalDomicileState>MA</LegalDomicileState>
        <ExemptCodeSection>501(C)(9)</ExemptCodeSection>
        <PublicCharityStatus>NA</PublicCharityStatus>
        <DirectControllingEntityName>
          <BusinessNameLine1>The Marine Biological Laboratory</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrg>1</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>TR U A Marine Biological Laboratory</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>7 MBL Street</AddressLine1>
          <City>Woods Hole</City>
          <State>MA</State>
          <ZIPCode>02543</ZIPCode>
        </AddressUS>
        <EIN>136044672</EIN>
        <PrimaryActivities>General support of the MBL</PrimaryActivities>
        <LegalDomicileState>NY</LegalDomicileState>
        <ExemptCodeSection>4947(A)(1)</ExemptCodeSection>
        <DirectControllingEntityName>
          <BusinessNameLine1>Trustees</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>TR U A Marine Biological Lab Library</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>7 MBL Street</AddressLine1>
          <City>Woods Hole</City>
          <State>MA</State>
          <ZIPCode>02543</ZIPCode>
        </AddressUS>
        <EIN>136045011</EIN>
        <PrimaryActivities>Support for the MBL Library</PrimaryActivities>
        <LegalDomicileState>NY</LegalDomicileState>
        <ExemptCodeSection>4947(A)(1)</ExemptCodeSection>
        <DirectControllingEntityName>
          <BusinessNameLine1>Trustees</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>0</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>1</GiftGrantOrCapContrFrOtherOrg>
      <LoansOrGuaranteesToOtherOrg>0</LoansOrGuaranteesToOtherOrg>
      <LoansOrGuaranteesFromOtherOrg>0</LoansOrGuaranteesFromOtherOrg>
      <SaleOfAssetsToOtherOrg>0</SaleOfAssetsToOtherOrg>
      <PurchaseOfAssetsFromOtherOrg>0</PurchaseOfAssetsFromOtherOrg>
      <ExchangeOfAssets>0</ExchangeOfAssets>
      <RentalOfFacilitiesToOtherOrgs>0</RentalOfFacilitiesToOtherOrgs>
      <RentalOfFacilitiesFrOtherOrgs>0</RentalOfFacilitiesFrOtherOrgs>
      <PerformOfServicesForOtherOrgs>1</PerformOfServicesForOtherOrgs>
      <PerformOfServicesByOtherOrgs>0</PerformOfServicesByOtherOrgs>
      <SharingOfFacilities>0</SharingOfFacilities>
      <SharingOfPaidEmployees>0</SharingOfPaidEmployees>
      <ReimbursementPaidToOtherOrg>0</ReimbursementPaidToOtherOrg>
      <ReimbursementPaidByOtherOrg>0</ReimbursementPaidByOtherOrg>
      <OtherTransferToOtherOrg>0</OtherTransferToOtherOrg>
      <OtherTransferFromOtherOrg>0</OtherTransferFromOtherOrg>
    </IRS990ScheduleR>
  </ReturnData>
</Return>