56. LEircisGUi^. 243 



orbit. Origin of the dorsal fin nearer to the end of the snout than 

 to the root of the caudal ; caudal deeply forked. Coloration uniform. 

 {Girard.) 

 Gila Eiver. 



44. Leuciscus crassicauda. 



Laviuia crassicauda, Bainl 8j- Giranl, Proc. Ac. Nat. Sc. Philad. 18o4, 



p. 137. 

 Siboma crassicauda, Giranl, I. c. 18oG, p. 208 ; U, S. ^- Pac. R. li, 



Exped. Fish. p. 296, pi. 64. figs. 1-4. 



D. 11, A. 9. V. 10. L. lat. 58. L. transv. 10/10, 

 The height of the body is a little more than the length of the 

 head, which is one-fourth of the total (without caudal) ; the free 

 portion of the tail is nearly as deep as long. Snout of moderate 

 extent, longer than the eye, the diameter of which is one-sixth of 

 the length of the head. Mouth anterior, subhorizontal, with the jaws 

 nearly even. The maxillary does not reach the vertical from the 

 front margin of the orbit. The postorbital is rather larger than the 

 prteorbital, the hinder suborbital being two-thirds as wide as the 

 postorbital. Origin of the dorsal fin considerably nearer to the root 

 of the tail than to the end of the snout, somewhat in advance of the 

 origin of the vcntrals. Anal higher than long, caudal slightly emar- 

 ginate. The pectoral fins terminate at a great distance from the 

 vcntrals, which extend to the anal. There are seven longitudinal 

 series of scales between the lateral line and ventral fin. Coloration 

 uniform. 



Pharyngeal teeth 5 . 2 — 2 or 1 . 4, compressed, not denticulated, 

 claw-shaped. 

 California. 



a-d. From 7 to 12 inches long. San Francisco, Presented by Dr, 

 W. 0. Ayres. 



45. Leuciscus cooperi, 



Oheonda cooperi, Girard, Proc. Acad. Nat. Sc. Philad. 1856, p. 207 ; 

 U. IS. iyPac. R. R. E.qyed. Fish. p. 294, pi. 63. figs. 1-5. 



D. 2/9. A. 2/11. V. 10. 



Scales of moderate size. The height of the body equals the length 

 of the head, and is one-fourth of the total (without caudal). Upper 

 profile regular. Snout of moderate length, longer than tlie diameter 

 of the eye, which is two-ninths of the length of the head. The 

 upper jaw slightly overlaps the lower, and the maxillary does not 

 reach to the vertical from the front margin of the orbit. The origin 

 of the dorsal fin is behind that of the ventral, and nearer to the root 

 of the caudal than to the end of the snout. Caudal tin emargi- 

 natc. Pectorals not extending to the vcntrals. Coloration uniform. 

 {Girard.) 



Pharyngeal teeth compressed, hooked, "snth a grinding surface, 

 4 . 2—2 . 5. 



Cohirabia Eiver. 



k2 



