31. CYPRINID^ — COCIILOGNATIIUS. 
161 
§2.— COCIILOGNAX'SHIS Baird & Girard. 
(Baird & Girard, Proc. Acad. Nat. Sci. Pliila. 1854, 158 : type Cochlognathus ornatus B. 
G.) 
This genus has the general character and apiiearance of BijhorltyncJins, 
the dentition and the structure of the fins being the same ; the teeth, 
however, rather more strongly hooked and with deeper grinding sur- 
face. It ditfers in the structure of the jaws, which are provided each 
with a hard cutting plate, to all appearance precisely like the Diodonti- 
d(e, the sharp bony edge being surrounded by the usual lip. First ray 
of dorsal separated by membrane, and spine-like, as in Hyhorliynclms 
Siwd. Fimei)]iales. Alimentary canal short. Peritoneum white. Pseudo- 
brauchifB present. Lateral line complete. Anal fin small, {y.uyluc;^ 
shell; yvdOo:;^ jaw i the covering of the jaws being hard, like shell.) 
196. C. oriiatMS Baird & Girard. — Hard-mouth Minnow. 
Apjiearance, dorsal fin and coloration essentially as in Ryhorhynchus 
notatus. Bodj^ moderately elongate. Head rather long. Scales com- 
paratively large. Dorsal fin over the ventrals, rather high. Anal fin 
quite small. Caudal fin short. Dorsal fin with a black spot near the 
base in front and a dusky blotch behind. The dorsal spine conspicu- 
ous. Caudal fin with a dusky median band, in front and behind which 
is a pale area. A dusky lateral baud. Snout tuberculate in spring 
• males, as in Ilyhorliynclms. Head 4; depth l^. D. 8 ; A. 6 ; Lat. 1. 40; 
teeth 4— L L. 3 inches. Eio Grande. A singular little fish, with the 
mouth resembling that of Chondrostoma ov Acrochilus, but the structure 
otherwise resembling neither. 
(Baird & Girard, Proc. Acad. Nat. Sci. Pliila. 1854, 153; Giiuther, vii, 187.) 
19'S'. C. bigaattatus Cope. 
“A fish of rather uniform diameter and deep caudal peduncle. The 
head is oblong and rather wide above. The muzzle has a decurved pro- 
file and terminal mouth. The orbit is large, of in head, a little less 
than muzzle and than interorbital space. Head wide behind and flat 
above. The infraorbital bones are narrow, while the preorbital is large, 
with convex inferior and concave superior border. Maxillaiy not quite 
reaching line of orbit. Ventral fins inserted opposite second or third 
dorsal ray, reaching to vent. Anal fin small. Pectorals reaching three- 
fifths to ventrals. Color silvery, without dark markings, except a black 
spot at the base of the caudal and on the anterior rays of the dorsal. 
Head 5 in length, with the caudal fin ^ depth a little less. D. S ; A. 7 ; 
scales 7-34-? L. 2^ inches. Trinity Fiver, Texas.’’ {Cojie, xMSS.) 
Bull. Eat. Mus. Eo. IG 11 
