31. CYPRINIDJi: — COCIILOGNATIIUS. IGl 



82.— COCItLOGi\ATflHJS Baird & Giranl. 



(Baird & Girard, Pioc. Acad. Nat. Sci. Pliila. Itt54, 158 : type Cochlognatlms ornatus B. 

 «fc G.) 



This genus lias the general character and appearance of Eyborhynchus, 

 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 differs in the structure of the jaws, which are provided eacli 

 with a hard cutting plate, to all appearance i^recisely like the Biodonti- 

 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 

 i\nd Finu'phales. Alimentary canal short. Peritoneum white. Pseudo- 

 branchite present. Lateral line complete. Anal fin small. {/.ayXo^^ 

 shell; yvdOo:;, jnw; the covering of the jaws being hard, like shell.) 



196. C ornatus Baird & Girard. — Hard-mouth Minnow. 



Appearance, dorsal fin and coloration essentially as in Hyhorhynclius 

 notatns. Body moderately elongate. Head rather long. Scales com- 

 jiaratively 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 band. Snout tuberculate in spring 

 males, as in Hyhorliynchus. Head 4 ; depth 4^. D. 8 ; A. G ; Lat. 1. 40 ; 

 teeth 4-4. L. 3 inches. Eio Grande. A singular little fish, with the 

 mouth resembling that of Chondrostoma or Acroch II us, but the structure 

 otherwise resembling neither. 



(Baird & Girard, Proc. Acad. Nat. Sci. Pbila. 1854, 158; Giiuthor, vii, 187.) 



lOY. C bi^uttatus 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, 3|- in head, a little less 

 than muzzle and than iuterorbital space. Head wide behind and flat 

 above. The infraorbital bones are narrow, while the preorbital is large, 

 with convex inferior and concave superior border. Maxillary 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 o in length, with the caudal fin ; depth a little less. D. 8 ; A. 7 ; 

 scales 7-34-? L. 2^ inches. Trinity Pviver, Texas." [Cojje, MSS.) 

 Bull. Nat. Mus. No. IG 11 



