SERVICE SHARES)

                                                                    Exhibit 8(f)

                   AMENDMENT TO FUND PARTICIPATION AGREEMENT

                                (SERVICE SHARES)

     This Amendment (this "Amendment") dated September 1, 2006 to the Fund
Participation Agreement dated February 25, 2000 (the "Agreement") between Janus
Aspen Series, an open- end management investment company organized as a Delaware
business trust (the "Trust"), and Commonwealth Annuity and Life Insurance
Company, a life insurance company organized under the laws of the Commonwealth
of Massachusetts as successor-in-interest to Allmerica Financial Life Insurance
and Annuity Company (the "Company").

                                    RECITALS

WHEREAS, effective September 1, 2006, Allmerica Financial Life Insurance and
Annuity Company changed its name to Commonwealth Annuity and Life Insurance
Company; and

WHEREAS, the parties wish to further amend the Agreement as set forth below.

                                   AMENDMENT

NOW THEREFORE, for good and valuable consideration, the receipt of which is
hereby acknowledged, the parties agree to amend the Agreement as follows:

     1. The name of the company on the Agreement shall be changed from Allmerica
     Financial Life Insurance and Annuity Company to Commonwealth Annuity and
     Life Insurance Company.

IN WITNESS WHEREOF, the parties have caused their duly authorized officers to
execute this Amendment as of the date and year first above written.

JANUS ASPEN SERIES                       COMMONWEALTH ANNUITY AND LIFE INSURANCE
                                         COMPANY

By: /s/ Xxxxxxxxx Grauerholtz-Xxxxxx     By: /s/ Xxxxxxx Xxxxxxx
    -----------------------------------      -----------------------------------
Name: Xxxxxxxxx Grauerholtz-Xxxxxx       Name: Xxxxxxx Xxxxxxx
Title: Vice President                    Title: President