546 TYPES OF FISHES IN PAKIS MUSEUM. 



88. Batrachus cryptocentrus. (Cuv. & Val., xii, 485.) 



A specimen, .35™ long, from Bahia. Mus6e de Greneve. 

 Color mottled-brown, apparently without spots. Dorsal spines nearly 

 hidden in the loose skin. No foramen in axil, but the skin of the axil 

 covered with small parallel folds of skin, which are occasionally con- 

 nected by cross-folds. Spines of head nearly hidden. Teeth short and 

 very blunt. Eays of dorsal and anal enveloped in skin, and not easily 

 counted ; 28 to 30 soft rays in the dorsal and 22 to 24 in the anal. Cir- 

 rus over eye conspicuous. 



This is a valid species, and, with B. grunniens, B. diemensiSy and other 

 species without foramen in the axil, it should probably constitute a new 

 genus. This genus may receive the name of Maecgravia, in tardy 

 recognition of the work of the original discoverer of the species, Georg 

 Marcgrav, of Liebstad, author of the "Historia Rerum Naturalium 

 Brasiliae" (1648), and one of the ablest of the early writers on Ameri- 

 can natural history. The species may stand as MarcGtRAVIA cryp- 



TOCENTKA. 



Indiana University, October 2, 1886. 



