832 FISHES — CATOSTOMID^. 



mens obtained in Illinois River by Professor A. W. Brayton ; (e) a pair 

 of pharyngeal bones taken by Dr. G M. Levette from a specimen taken in 

 the Wab .sh at Terre Haute, where the fish is said to be abundant; (d) a 

 pharyngeal bone and air-bladder from a specimen taken in Detroit River 

 by Professor Biird ; (f) a pharyngeal boae from '' post pliocene " deposits 

 at the Fills of the Ohio by Dr. John Sloan, and (/) many specimens 

 taken in fish traps in French Broad River where it is the most abundant 

 of the Suckers, Excepting Professor Cope's original type, the above 

 mentioned are the only specimens on record. 



Gknus 24. QUASSILABIA. Jordan and Brayton. 



Lagochila, Jordan and Brayton, Proc. Acad. Nat. Sci. Phila., 1877, 280 (preoceapied in 



coQcUili'gy as LagocJiilua). 

 Qaasailabia, (.)okdav aad BitAYTON) Jordan, Man. Vert., E. U. S , 3d Ed , 1878, 401. 



T 1 pe, Lagochila lacera, Joidau and B raj ton. 



Etymology, Litin, quasstis, broken or torn ; lahia, lip 



Body elongated, not much compressed, not elevated ; head shortish, conical, with 

 lengthened Buont, its length four and a half to five in body, the opercular region being 

 reduced, so that the eye is well backwards ; snboibital bones narrow ; foiitane le large, 

 widely open ; mouth large, singular in structure, inferior, the upper lip not protractile, 

 greatly prolonged, its surface clisely plicate ; lower lip much reduced, divided into two 

 distinct elongate lones, which are weakly pajjillose; the split between these lobes ex- 

 tends backwards tothe edge of the dentary bones which are provided with a horny plate 

 as in the western genus Pantosieua ; the lower li|) is entirely separated by a deep fissure, 

 from ihe upper at its angle; the skin of the cheeks forms a sort of cloak over this fis- 

 sure, tbe crease separating this skin from the lips extends dowa on the ujder side of the 

 head ; muciferons tubes well developed ; fins moderate, of the same type as in ilyxoa- 

 toma ; scales large, the lateral line well developed and nearly straight, with aboat'45 

 scales in its cause; air-bladder in three parts. 



But one species is known, one of the most singular of Americm fishes 



49. QoAssiLABiA. LACERA Jordan and Brayton. 



Ilare-lip Sucker; Sp:it-iiiouth Sucker; may Sucker of ilie 



Scioto; Cut-lip. 



Lagochila lacera, Jordan and Brayton, Proc, Acad. Nat. Sci. Phila,, 1877, 280.— Jordan, 



Man Vert , 2d Ed., 1878, 311. 

 Qmaailatia lacera, Jordan, Man. Vert,, 2d Ed,, 1878, 406 ; Bull. U. S. Geol. Surv. Terr., 



1878, 418 ; Ball. U. S. Nat. Mus., xii, 1878, 100. 

 DeecripUon. — Head short, conical, with lengthened snout, the region between the e^es 

 flattened and with prominent mucous ridges; cheeks and lower part of head tumid; 

 operole very small, its greatest length scarcely greater than the diameter of the eye j 

 four and one-third in length of head, two in length of snout, its situation thus quite in- 

 ferior ; length of top of head one and two- thirds in distance from the anout to the base 



