CATOSTOMID.E. C1X. 311 



jj. Mouth larger, sub-terminal, protractile forwards (species 

 of larger size, dusky colors, with lower dorsal). 



ICHTHYOBTJS, 10 



u. Pharyngeal bones strong ; the teeth comparatively coarse 

 and large, increasing in size downwards; dorsal fin 

 moderately elevated ; mouth inferior. BUBALICHTHYS, 11. 



/. QUASSILABIA, Jordan & Brayton. HAKE LIP SUCKERS. 

 (Lagochila, J. & B., preoccupied.) 



1. Q. lacera, Jor. & Brayt. HARE LIP SUCKER. SPLIT 

 MOUTH SUCKER. Head short, 4f in body, with length- 

 ened, non -protractile fleshy snout; body elongate, its 

 depth about 5 in length; eye medium, set far back, the 

 opercle small; fins not large; scales, etc., as in Myxos- 

 toma; D. I, 12; A. I, 7; V. 9; lat. 1. 45. Tennessee 

 and Cumberland Rivers; a most remarkable species, 

 bearing the same relation to the other C atostomidce, that 

 Exoglossum does to the other Cyprinidos. It seems to 

 possess roal affinities with Exoglossum. 



2. PLACOPHARYNX, Cope. PLACOPHARYNX. 



1. P. carinatus, Cope. COPE'S SUCKER. Resembles 

 M. anisura, but the lips and pharyngeal bones quite 

 different; eye 4 in head; head 4 in length; depth 3f ; 

 head strongly ridged above; pharyngeal bones very 

 heavy, the lower 7 to 12 teeth on each side very large, 

 scarcely compressed; truncate, irregularly placed; D. I, 

 14; A. I, 7; lat. 1. 41; head with a median ridge on top; 

 a large, coarse species similar in general characters to 

 Myxostoma, but with the physiognomy approaching 

 somewhat that of Ichthyobus. It is probably common 

 in the Western streams, although it was not noticed 

 until 1870. I have specimens from the Illinois, Wabash, 

 Detroit, Falls of the Ohio and the Scioto, and French 

 Broad. 



