76 CALIFORNIA ACADEMY OF SCIENCES. 



teeth small, outer enlarged; anterior part of body naked, 

 posterior part covered with cycloid scales. 



70. Cayennia guichenoti Sauvage. Cayenne. 



Sauvage. Bull. Soc. Philom. Series 7, iv, 57. 1880. 



Head 9 in total; depth 17; D. VI, 17; A. 1, 16; vertebrae 

 about 36. 



Head deeper than wide; eye small, placed well forward; 

 maxillary reaching to below posterior margin of eye; a low 

 membrane connecting dorsal and caudal; caudal 7 in length; 

 ventrals 1| in head; brownish, marbled with black an- 

 teriorly; length 0,400 (Cayenne). 



Perhaps the most interesting fact connected with the 

 study of the American Gobies is that six of the seventy 

 species, distributed in four, probably five genera, are half 

 naked. Three of these were known at the time Giinther's 

 catalogue was written, all from Panama. Since then, Sauvage 

 has discovered another half naked species at Surinam; a 

 sixth species, whose habitat is unfortunately not definitely 

 known, has been added in this paper. 



The American Gobies fall into four more or less natural 

 groups — Oxymetopontince, Eleotridince, Gobiince and Gobioidii- 

 nce; and what is most remarkable, three of these sub-families 

 have each one or more half naked representatives. How 

 widely these half naked species may be distributed cannot 

 be told ixom the few data. Nothingjs known of them, but 

 that they exist. An explanation why they are found only in 

 the waters of Central America and the West Indies, should 

 not be attempted until it has been proved that they are con- 

 fined to these waters. 



Family CALLIONYMID^. 



XXIV. Callionymus Linnaeus. 



71. Callionymus calliurus spec. nov. 



No. 26 260, one specimen. Ofif South Beach, Key West, 5 fathoms. 

 Pourtales, 1869. 



