30. CATOSTOMID^ QUASSILABIA. 
143 
in Moxostoma, and the lips are thicker. Size large. a broad sur- 
face; pharynx.) 
168. P. cai’iiiatMS Cope. 
Body oblong, moderately compressed, heavy at the slionlders. Head 
very large, Sj in length of the body. Eye small, behind the middle of 
the head. Month extremely large, the lower jaw oblique when the 
month is closed, the month, therefore, i)rotractile forwards as well as 
downwards. Lips very thick, coarsely ijlicate, the lower lip full and 
heavy, truncate behind. Head above evenly rounded or somewhat eari- 
nated. Scales G-45-6. Dorsal rays 13 ; ventral 9. Color brassy green 
above; lower fins red. Great Lakes and Mississippi Valley; abundant 
in many streams. 
(Cope, Proc. Amer. Phil. Soc. Phila. 1870, 4(57 ; Jorclau, Mau. Vert. 311; Jordan, 
BuU. U. S. Nat. Mus. sii, 108.) 
70 . — QUASSSIjABIA Jordan & Brayton. 
Hare-lip Sucl'ers. 
(Lagochila Jordan & Brayton, iireoccupicd.) 
(Jordan & Brayton, Man. Vert. E. U. S. ed. 2, 1878, 401: type Lagocliila lacera Jordaii 
& Brayton.) 
Suckers like Moxostoma in every respect excepting the structure of 
the mouth. Head shortish, conical, with lengthened snout; its length 
4^5 times in that of the body, the opercular region being reduced, 
so that the eye is well backwards. Suborbital bones narrow. Eon- 
tanelle large, widely open. Mouth large, singular in structure, in- 
ferior, the upper lip not protractile, greatly prolonged, closely plicate. 
Lower lip much reduced, divided into two distinct elongate lobes, which 
are weakly papillose. The split between these lobes extends backwards 
to the edge of the dentary bones, which are provided with a rather hard, 
horny plate, as in Fantosteus. The lower lip is entirely separated from 
the upper at the angles by a deep fissure. The skin of the cheeks forms 
a sort of cloak over this fissure, the crease separating this skin from the 
mouth extending up on the sides of the muzzle. The crease between 
the lips extends down on the under side of the head. System of mucif- 
erous tubes well developed. Pharyngeal bones not dissimilar from the 
usual type in Moxostoma^ rather weak, with numerous small teeth. 
Body elongate, not much compressed, not elevated. Fins moderate, 
formed as in Moxostoma. Scales large, as^iu ]\[oxostoma^ the lateral line 
well developed and nearly straight, with about 45 scales in its course. 
Air-bladder in three parts. Sexual peculiarities unknown; probably 
little marked. {Quassus, broken or torn; labia, lii^.) 
