Exhibit 7(jj)

                                     Form of
                                LETTER AGREEMENT

_________, 2008

State Street Bank and Trust Company
Global Investor Services Group
2 Avenue de Lafayette LCC2S
Boston, Massachusetts 02111

To Whom It May Concern:

Please be advised that Janus Adviser Series (the "Trust") has established Janus
Adviser Modular Portfolio Construction Fund as a new series of the Trust,
effective on or about September 3, 2008. Pursuant to the existing Amended and
Restated Custodian Contract between the Trust and State Street Bank and Trust
Company ("State Street"), the Trust requests confirmation that State Street will
act as custodian for the new series under the terms of the contract.

Please indicate your acceptance of the foregoing by executing two copies of this
Letter Agreement, returning one copy to the Trust and retaining one copy for
your records.

JANUS ADVISER SERIES


By:
   ----------------------------------
   Stephanie Grauerholz-Lofton,
   Vice President and Secretary


STATE STREET BANK AND TRUST COMPANY


By:
   ----------------------------------

Agreed to this ____ day of _____________ 2008

cc: Rodney DeWalt