31. CYPR1NID.E PTYCHOCHILUS. 225 



chiefly west of the Cascade Kange, from California to British Columbia, 

 often entering- the sea; abundant. 



(Cyprinus (Leuciscns) caurinus Richardson, Fauna Bor.-Amer. Fishes, 1836, 304: My- 

 locheilus Jntcralis, caurunis, and fralerculus Girard, U. S. Pac. R. R. Surv. x, 213-215: 

 LcitcosoniHs caurinus Giinther, vii, 270.) 



99. JHYJLOPIIARODON Ayi-es. 



(Ayres, Proc. Cal. Acad. Nat. Sci. 1855, 33: type Mylopharodon robust us Ayres = Gila 

 conocephala B. & G. ) 



Body elongate. Head large, pike-like, the upper jaw not protrac- 

 tile; no barbel. Teeth 2, 4-5, 2; two or three of the teeth in the main 

 row molar, truncate or bluntly rounded at the apex, much enlarged. 

 Month terminal, rather large, with thickened lips. Scales rather small. 

 Lateral line continuous. Dorsal tin inserted behind the ventrals. Anal 

 basis short. Size very large. This genus has been confounded with 

 MylocliiluSj from which it differs in the nou-protractility of the upper 

 jaw. (Shortened from Mylopliarynyodon ,uuA<r, grinder; ydpuy^ pha- 

 rynx; od (avj tOOth.) 



354. OT. coiioceplialtis (Baird & Girard) Grd. 



Body elongate, subfusiform, compressed. Head broad and depressed, 

 the snout tapering, almost wedge-shaped. Mouth horizontal, the jaws 

 about equal, the maxillary extending to eye. Eye small, about 7 in 

 head, 24 in snout; preorbital elongate. Intererbital space as long as 

 maxillary, 3 in head. Scales rather small, of the type usual in the 

 Pacific coast Cyprinidce. Dorsal fin a little behind ventrals. Caudal 

 fin 1 in head ; caudal peduncle very long, 4J in length. Color dark, 

 paler below. Head 3^; depth 4|. D. 8; A. 8; scales 17-74-7. L. 18 

 inches. Eivers of California. Next to the species of Ptychochilus the 

 largest of our Cyprinidce. 



(Gila conocepliala B. & G. Proc. Acad. Nat. Sci. Phila. 1854, 134: Mylopharodon ro- 

 bustns Ayres, Proc. Cal. Acad. Nat. Sci. 1855, 33: Mylopliarodon conoccphalus androbuslus 

 Grd. U. S. Pac. R. R. Surv. x, 216; Giinther, vii, 262.) 



1OO. PTYCIIOCIIII.US Agassiz. 



(Ptychocheilns Agassiz, Auier. Journ. Sci. Arts, 1855, 229: type Ptychochrilus gradli.fi 

 Agassiz Leuciscus oregoiiennis Rich.) 



Body elongated, little elevated, the caudal peduncle not contracted. 

 Head long, slender, pike like. Mouth nearly horizontal, widely cleft, 

 the maxillary extending to below the eye, the upper lip rather below 

 the level of the eye, the lower jaw included both anteriorly and later- 

 ally; no barbel; lips thick. Scales small, little imbricated, mostly 

 Bull. Nat. Mus. No. 16 15 



