322 FISHES. 



5. C. bison, Ag. BUFFALO CARP SUCKER. Muzzle 

 very long, conic; eye median, large, 4^ in head; body 

 elongate; depth 3 in length; dorsal fin elongate, nearly 

 as much so as in C. velifer; D. 28; lat. 1. 40. Missis- 

 sippi Valley. 



6. C. cyprinus, (LeS.) Ag. SILVEKY CAKP SUCKER. 

 Muzzle prominent, but rather obtuse; eye small, anterior, 

 5 in head; depth 2|- in length; longest dorsal rays about 

 | the length of the base of the fin; D. 28, or 29; lat. 1. 



40. N. Y. to Ala., East of the Alleghenies. 

 bb. Head smaller, 4 to 5 in length. 



7. C. thompsonif Ag. LAKE CARP SUCKER. Short 

 and stout; dorsal region much arched; scales narrowly 

 exposed; longest dorsal ray reaching the 22d; eye small, 

 5J in head; head 4J in length; depth 2J; D. 28; lat. 1. 



41. Great Lakes. 



8. C. carpio, (Raf.) Jordan. RIVER CAKP SUCKER. 

 Body more elongate, the depth 3 in length, the head 

 small, -nearly 5; longest dorsal rays shortest, reaching to 



the 16th ray; eye small, anterior; D. 30; lat. 1. 36, the 

 largest species, approaching Ichthyobus. Ohio Valley, 

 abundant. (C. nummifer, Cope.) 



10. ICHTHYOBUS, Rafinesque. BUFFALO FISH. 

 (Sclerognatkus, Val.) 



* Body robust, little compressed, the dorsal region not especially 

 elevated. 



1. /. buba/us, (Raf.) Ag. BROWN BUFFALO - FISH, 

 Depth 3 in length; head the same; eye small, 6^- in 

 head; depth of head five-sixths its length; opercle very 

 wide, forming nearly half the length of head convex 

 and furrowed; scales very large; dull brownish olive, 

 not silvery; D. 27; A. 10; lat. 1. 40; length (of specimen) 



