Distribui？？o dos Hydrozoa até agora conhecidos nas costas do Brasil

this work was done with the aim of computing all the species of hydrozoa (siphonophora excluded) that have been collected on the brazilian coast, or in the pelagial, near the coast (some of the "meteor" stations). nutting's (1900, 1904, 1915) and mayer's (1910) monographs were taken as starting points and later papers and the zoological record used to check posterior findings. as a whole, 116 different valid names, among species and forms, have been mentioned from the brazilian coast, distributed among 60 genera. of the 116 species, 82 are represented by hydropolyps, 30 by hydromedusae (11 of which belong to the trachylina and therefore lack a polypoid generation) and finally, by 4 species of which are known both polypoid and medusoid generations. the subdivision of the coast has been made at random, on account of the scarcity of the findings, except for the best known district, that goes from the latitude of vitoria (state of espirito santo, at about 20olat.s.) to the bay of santos (state of s？o paulo, about 24olat.s.). the latitude of cabo frio (23olat.s.) was considered as a possible natural barrier, and the results of the global counting of the distribution of the hydropolyps north and south of 23olat.s. is the following: 29 species are known only north of cabo frio, 26 only from the same latitude (see direction of the coast, along parallel 23os.) or further south and 28 species are known both north and south of the coast (of these, 5 species are "cosmopolitan"). therefore it seems quite possible that cabo frio really is a barrier to the distribution of 55 species. 26 species are endemic to the brazilian coast, of these, only 5 are found both north and south of the cape, while-14 are found only north and 7 only south. no studies can be done, on the bathymetric distribution in relation to the latitude. these results must be considered as provisory since more extensive researches will probably alter these figures. however, i believe that they are significative as