Subject to the limitation set forth below, every person who is now receiving or may hereafter receive an annuity or a pension from the Government of the United States Virgin Islands, by virtue of any retirement law or by special legislation, is hereby granted a cost-of-living bonus of $10 per month, effective on and after July 1, 1961; Provided, however, That this cost-of-living bonus shall be in addition to the cost-of-living bonus authorized by section 726 of this title; And provided further, That in no case shall any annuity or pension hereby affected plus the bonus heretofore and herein granted exceed $100 per month. In the cases of persons now receiving or who may hereafter receive an annuity and a special pension, the amounts of such annuity and special pension shall be combined for the purpose of determining eligibility for this cost-of-living bonus. In such cases, the total cost-of-living bonus shall not exceed $10, and shall be paid from the Pension Fund. The cost-of-living bonus of $10 per month herein authorized shall not be applicable to pensions granted by special legislation approved on and after January 1, 1962.