31. CYPR1NID.E rTYCHOCHILUS. 225 



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

 often entering the sea; abundant. 



{('i/priinis (Leuciscii.s) caHrhiits hMrhardsoii, p"'auii.T Bor.-Amer. Fbbcs, 188fl, o04 : Mi/- 

 locheUus lateralis, caiiriiuts, aud fraterciihis Girard, U. S. Pac. K. R. Siirv. x, 213-215: 

 LcHcosomus canriiius Giintlier, vii, 270.) 



f>9.-ITI Vfl.O P Bf A RODON Ayi-es. 



(Ayres, Proc. Cal. At-ad. Nat. 8ui. 1855, 33: type Mijloplinrodon robust us Ayrvs^^ (iila 

 conocephala B. & G. ) 



Body elongate. Head large, pike-like, tlie upi>er jaw not protrac- 

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

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

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

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

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

 MijJochilm, from which it dilfers in the non-protractility of the upper 

 jaw. (Shortened from Mulopharj/npodou — rivloq^ grinder; c^a/yf/'l, pha- 

 rynx ; o'jw^, tooth.) 



SS-l. M. COllOCeplialtlS (Baird & Girard) Grd. 



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



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



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



head, 2A in snout; preorbital elongate. Interorbital space as long as 



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



Pacific coast Cyprinidcc. Dorsal tin a little behind ventrals. Caudal 



fin \}y in head; caudal peduncle very long, 4i in length. Color dark, 



paler below. HeadSi; depth 4§. D. 8; A. 8; scales 17-74-7. L. 18 



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



largest of our Cyprinidcv. 



{Gila conocephala B. & G. Proc. Acad. Nat. Sci. Phila. 1854, 134: Mylopharoiloii ro- 

 hiiHtits Ayrcs, Proc. Cal. Acad. Nat. Sci. 1855, 33: Mylopharodon conoccphulus aud robiiKlus 

 Grd. U, S. Pac. R. K. Snrv. x, 21G; Giintlun-, vii, 262.) 



100.— PTrCBJOCIIBL,US Agassiz. 



{Ptifchocheilus Agassiz, x\ni(;r. Joiuii. Sci. Arts, 1855, 229: type Pti/chocIicHi(s (jracilis 

 Agassiz = Leuciscus oregonensis 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 npper 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. 10 15 



