The present note represents the inventary of the parasitic copepods found on marine fishes between 1940-1949 and which are kept in the "Instituto Paulista de Oceanografia" (São Paulo Oceanographic Institute). They all belong to the Suborders Cyclopoida, Caligoida and Lernaeopodoida and were partly received as donations and partly collected by the staff of the Institute, during its periodic trips to the coast of the State of São Paulo (Brazil); finally, a small fraction was obtained from parasitized fishes purchased on the markets of Santos an São Paulo. The author, thus, gathered 117 specimens, distributed by 8 families, 11 genera and 13 different species, one of which belongs to the genus Caligus and could not be specifically determined due to the lack of bibliography. The Copepods were obtained from 22 fishes, among which only 5 were abundantly infected and exhibited respectively 10, 14, 16, 18, and 37 parasites. None of the hosts showed any sign of evident organic weakness.
