Jordan and Ever^nann. — Fishes of North America. 219 



truncate or bluntly rounded at the apex, much enlarged. Mouth terminal, 

 rather large, with thickened lips. Scales rather small ; lateral line con- 

 tinuous. Dorsal fin inserted behind the ventrals. Anal basis short. Size 

 very large. Pacific slope. This genus resembles Mi/locheilus, from which 

 it differs in the nonprotractility of the upper jaw. Both represent a 

 comparatively primitive type of Cyprinid a, allied to Asiatic forms. (Short- 

 ened from Myloj)hariinr/odoii — /ni'Tior, grinder ; 0dpvy^, pharynx ; (xhix, tooth. ) 



351. MYLOPHARODOX CONOCEPHALUS (Baird A- Girard). 



HeadSi; depth 4|; eye 7. D.8; A. 8; scales 17-74-7. Body elongate, 

 Bubfusiform, compressed. Head l)road and depressed, the snout tapering. 

 Mouth horizontal, the jaws about equal, the maxillary extending to eye. 

 Eye small, 2i in snout ; preorbital elongate. luterorbital space as long as 

 maxillary, 3 in head. Scales rather small, loosely imbricated. Dorsal fin 

 a little behind ventrals. Caudal fin 1^ in head, the lower lobe very long, 

 longer than upper; caudal peduncle very long, 4i in length. Color dark, 

 paler below, no red. Length 2 to 3 feet. Sacramento and San Joaquin 

 rivers; uot very common; next to the species of Pfyc/ioc/i«7«s, the largest 

 of OUT Cyimnida;. {kuvoc, cone ; K£(pa?if/, head.) 



Gila coHoccphula, Baird & Gikard, Proc. Ac. Nat. Sci. Tbila., 1854, 134, San Joaquin River. 



(Coll. Heermann.) 

 Mi/Jopharodon robustus, Atkes, Proc. Cal. Ac. Nat. Sci., 1855, 33, San Francisco. (Coll. Ayres.) 

 MyJopharofUm couocephalus a.nd rohnslus, Girard, Pac. R. K. Surv., x, 21G, 1858. 

 Mylopharodon conocephaliis, GCnther, Cat., vii, 2G2 ; Jopdan & Gilbert, Synopsis, 225, 1883. 



110. MYLOCHEILUS, Agassiz. 



Mylocheilus, AoASSiz, Amer. Journ. Sci. Arts., 1855, 229, {laieralk). 



Body elongate, not elevated, little compressed. Head rather short, 

 conic, somewhat pointed. Mouth rather small, little oblique, the lower 

 jaw included ; maxillary with a small barbel at its end ; upper jaw pro- 

 tractile. Scales moderate, not closely imbricated. Lateral line decurved. 

 Dorsal fin beginning nearly opposite ventrals. Caudal fin with the rudi- 

 mentary rays little developed. Anal basis short. Intestinal canal about 

 as long as body. Teeth 2, 5-5, 2, or 2, 5—4, 2, those in the main row hooked 

 in the young ; 2 or 3 of these becoming molar with age, much enlarged, 

 blunt and truncate above. (A third deciduous row sometimes present, 

 according to Girard, in thi.5 genus and in Mylopharodon ; we have seen 

 nothing of the kind.) Size large. Pacific Slope, (/vy^of, grinder ; ,i;f?J\of, 

 lip.) 



352. MYLOCHEILUS CAURINUS (Richardson). 



(Columbia Chub.) 



Head 4?; depth 4^; eye 5 ; snout 3i. D.8; A. 8; scales 12-77-7; teeth 

 1, or 2, 5-5, 2 or 1. Interorbital space broad, convex. Mouth horizontal 

 or nearly so, the maxillary uot reaching the front of the eye ; siiborbital 

 bones wide ; preorbital elongate. Teeth hooked in tlie young, some of 

 them becoming stump-like with age. Color dark above ; sides silvery, a 

 dark lateral band; below this a pale stripe, under which is a dark stripe, 

 which extends about to the vent ; fins plain ; belly and pale stripe red in 



