324 FISHES. 



lateral line, and but an eighth or tenth further from the 

 dorsal line than the ventral; greatest depth midway of 

 body over ventrals and just in advance of dorsal; depth 

 3 in length; head strongly transversely convex, almost 

 rido-ed above, less narrowed downwards than in bubn- 



O * 



lus ; greatest depth of head 1^ in its length; interor- 

 bital space 2; eye=snout 5 in head, much smaller 

 than in bub<t1t* : snout scarcely projecting; no depres- 

 sion at occiput; an almost even curve from snout to 

 dorsal; head bounded by curves, therefore not trian- 

 gular, thicker, larger, and less pointed than in bubal us ; 

 mouth large, with a large and pappillose lower lip; man- 

 dible longer than eye; scales 8 41 7; fin rays D. I, 

 30; A. I, 11; dorsal not so high nor so rapidly depressed 

 as in bubal us, the longest ray scarcely half the length 

 of the base of the fin, reaching to the 15th, the 9th ray, 

 half the height of the first; anal reaching caudal, its 

 middle rays more rounded, not so much shorter than the 

 first; pectorals as long as ventrals, both longer than anal 

 and less than head; colors very dark; fins all black. 

 Mississippi and Ohio Rivers. 



2. B. altus, Nelson. DEEP-BODIED BUFFALO. Body 

 very deep and much compressed; the back is much 

 arched and the profile descends steeply in front to end 

 of snout, not forming an angle with it as in many 

 species of Ichthyobus; depth of body 2^ in length; head 

 4 in length; greatest thickness of body 1J in length of 

 head; depth of head 1^ in its length; width 1|- in 

 length; eye 5^- in head, 2o- in interorbital space, which is 

 but little rounded; lateral line perfectly straight from 

 upper edge of opercle to caudal; scales 8 35 5; dor- 

 sal I. 25; A. I, 9; color in spirits, dull yellowish-olive; 

 fins dusky. Illinois. (JV~<e&on. Same as the next!) 



