31. CYPRINID^ — GILA. 
227 
depth of. D. S; A. 7 5 scales 17-90-9; teeth 2 , o-l, 2 . L. 30 inches. 
Sacramento liiver, with P. oregonensis, but less common in the markets. 
(Jordau & Gilbert, Proc. U. S. Nat. Mus. 18S1.) 
35§. P. IsiciMS Grd . — Colorado “ Pike’\ 
Body slender, elongate, with long, slender, depressed head ; the form 
and general appearance being that of Pf. oregonensis. IMaxillary reaching 
jiast anterior margin of the eye. Ej-e small, 2f 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 31; depth 5 J. 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. Iclith. 
65.) 
101.— GIL. A Baird A Girard. 
(Baird & Girard, Proc. Acad. Nat. Sci. Phila. 1S53, 368: type Gila robasta B. & G.) 
Body elongate, little compressed, the liack 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. xAnal basis short. Intestinal canal short . 
Scales very small, little imbricated, sometimes scarcely imbricate at iill, 
longer than deep, especially ijosteriorly. JIo barbel. Pseudobran chim 
present. Teeth 3, 5-4, 2, close set, compressed and hooked, without 
grinding surface. Vertebne about 46 (5 or 6 more than usual in SquaUds). 
Intestinal canal short; peritoneum dusky. S]Decies of large size, the 
typical form remarkably unlike the usual Cypriuoid type, but varying 
through a series of intermediate forms directly into SquaUus^ so that 
the genus is hardly distinguishable by any definite technical character, 
unless the greater number of vertebrie be found constant. 
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. G. elcg:aus 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 
