31. CYPRINID^ GILA. 227 



depth 5|. D. S; A. 7; scales 17-90-9; teeth 2, 5-4, 2. L. 30 inches. 

 Sacramento River, with P. oregonensis, but less common in the markets. 



(Jordan & Gilbert, Proc. U. S. Nat. Mus. 1881.) 

 358. P. lucilis Grd. Colorado "Pike". 



Body slender, elongate, with long, slender, depressed head ; the form 

 and general appearance being that ofPt. oregonensis. Maxillary reaching 

 j>ast anterior margin of the eye. Eye small, 2^ in snout, 7 in head. 

 Lateral line very strongly decurved. Fins low, the dorsal evidently 

 behind ventrals. Scales very small. Coloration plain, darker above. 

 Head 3^; depth 5. D.9; A. 9; Lat. 1. 104; teeth 2, 4-5, 2. Colorado 



River; abundant. 



. 

 (Girard. Proc. Acad. Nat. Sci. Phila. 1856, 209, and U. S. Mex. Bound. Surv. Ichth. 



63.) 



1O1. OIL, A Baird & Girard. 





(Baird & Girard, Proc. Acad. Nat. Sci. Phila. 1853, 363: type Gilu robuxta B. & G.) 



Body elongate, little compressed, the back arched, especially in the 

 adult; the caudal peduncle typically extremely long, slender, con- 

 tracted, much narrower than the base of the caudal fin, which is widely 

 forked, with its basal fulcra very much developed. Head in typical spe- 

 cies broad, depressed, its profile concave. Mouth large, horizontal, and 

 overlapped by the broad snout. Dorsal fin behind the middle of the 

 body, slightly behind ventrals. Anal basis short. Intestinal canal snort 

 Scales very small, little imbricated, sometimes scarcely imbricate at nil, 

 longer than deep, especially posteriorly. No barbel. Pseudobrauchire 

 present. Teeth 2, 5-4, 2, close set, compressed and hooked, without 

 grinding surface. Vertebrae about 46 (5 or G more than usual in Squalin;)). 

 Intestinal canal short; peritoneum dusky. Species of large size, the 

 typical form remarkably unlike the usual Cyprinoid type, but varying 

 through a series of intermediate forms directly into Squalius, so that 

 the genus is hardly distinguishable by any definite technical character, 

 unless the greater number of vertebrte be found constant. ( Gila, the 

 name of the river where the typical species was first obtained.) 



* Head depressed anteriorly, the occipital region high, so that the profile is notably 

 concave. 



359. Ci. clegaiis B. & G. 



The extreme species of this type. Body elongate, somewhat com- 

 pressed, the region before the dorsal elevated, forming a sort of hump, 

 the dorsal fin inserted on the downward slope of the back, so that its 

 base is quite oblique. Caudal peduncle extremely long and slender, as 



