34 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY 1. 



ato between this subgenus and the foregoing, having 9 abdominal rays, 

 but an unequally bilobed tail." — (Raf.) 



55th species, Brown Buffalo-Pish, CATOSTOMUS BUB ALUS, Catostome 

 bubale. (p. 55.) 



ICHTHYOBUS BUBALUS (Raf.) Ag. 



Description passable. 



* 56th species. Black Buffalo-Fish, CATOSTOMUS NIGER. Catostome noir. 

 (p. 56.) 



? BUBALICHTHYS NIGER (Raf.) Ag. 



Description insufficient. 



3d subgenus, CARPIODES. (p. 56.) 



Car^piodes Agassiz and authors. 



"The C. cyprinus and C. setosus of Le Sueur belong to this subgenus." — 



(Raf.) 



+ 57th species, Olive Carp-Sucker, CATOSTOMUS CARPIO, Catostome 



carpe. (p. 56.) 



CARPIODES CARPIO Raf. 



Carpiodes nummifer Cope. 



This description apparently refers to the species lately called G. num- 

 mifer by Professor Cope. I therefore adopt Rafinesque's specific name. 



58th species, Sailing-Sucker, CATOSTOMUS VBLIFER, Catostome volant. 



(p. 56.) 



Carpiodes velifer (Raf.) Ag. 

 A fair description. 



X 59th species, Mud-Sucker, CATOSTOMUS XANTHOPUS, Catostome 

 xanthope. (p. 57.) 



Hypentelium nigricans (Le S.) Jor. 



It is possible that this description was intended for the Cat. nigricans 

 Le S., but the latter is certainly not a " mud-fish", as Professor Agassiz 



* Entirely black, lateral liue straight. 



■ I have not seen this fish. Mr. Audubon describes it as a peculiar species, found in 

 the Mississippi and the lower part of the Ohio, being entirely similar to the common 

 Bulfaio-fish, but larger, weighing sometimes upwards of 50 pounds, and living in sep- 

 arate shoals. 



. t Diameter one-fourth of the length; olivaceous above, pale beneath, chin white, 

 abdomen bluish ; lateral liue straight, dorsal fiu somewhat falcated with 36 rays, and 

 trapezoidal with 10 rays ; head sloping, snout rounded. 



. Seen at the falls of the Ohio ; commonly called Carp. Length from one to two 

 feet. Eyes very small and black ; fins olivaceous brown, the pectorals olivaceous, tra- 

 pczodial, short, and with 16 rays. Tail with 24. Dorsal fin beginning before the ab- 

 domiut'l and reaching the end of the anal fin. Not so good to eat as the Buifalo-fish. 

 X Diameter one-fourth of the length; lateral lino straight; silvery, back olivaceous, 



