This note deals with a post-larval stage of the Surgeon-fish, Acanthurus hepatus (L), from Trindade Island (praia das Tartarugas), Brazil, located at 20º 30' 00" S. and long. 29º 22' 00" W., 600 miles off the brazilian coast. The author compares this stage with an identical one described by Breder (1925), from Glover Reef specimens, off Yucatan.