666 



ZOOLOGY FISHES. 



ination of specimens, they have been found to correspond better with 

 Girard's description than any other species of this genus. Is found abundant 

 in same stream as preceding. 



GILA NACREA, Cope. 

 Gila nacrea, COPE, U. S. Geol. Surv. Terr., 1870, 441. 



This species is closely allied to the foregoing, but differs in a less 

 depressed cranium and much larger eye. The head is very nearly like that 

 of Ceratichthys and other ordinary Cyprinidce. From Green River, Wyo- 

 ming. 



GILA SEMINUDA, Cope & Yarrow, up. nov. 

 PLATE XXXI, FIGS. 1, la. 



This species is established upon a number of specimens secured from 

 the Rio Virgen River, an affluent of the Colorado ; the exact locality where 

 taken being a little south of Washington, Southern Utah. The species is 

 by no means scarce, as several hundreds were observed captured by boys 

 with hook and line. This species is closely allied to G. nacrea, Cope, but 

 has a larger eye and shorter head. 



Radii: D. 2-10; C. 34; A. 1-10; V. 10; P. 15. Teeth, 5.2-2.4. 

 Scales, 21-12, small and subcircular; none on belly. Length of head 5 

 times in total length, including caudal. Depth at dorsal fin 5.75 of total 

 length. Ventral fins originating slightly in advance of dorsal fin. Least 



