046 ZOOLOGY FISHES. 



Girard. The depth enters the total length 5.5 to 6 times, the head entering 

 the same five times; eye 4.3 times in length of head, 1.5 times in inter- 

 orbital width. The base of the D. I. is intermediate between the base of 

 the caudal fin and the anterior nostril. The ventral fins reach the anal, 

 but are not reached^ by the pectoral. Dorsal fin originating behind the 



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base of the ventrals. Radii: D. I. 9; A. I. 7; V. 8; P. 12. Scales, ^. Color 



white, with a few dark clouds on the candal peduncle. Inferior fins reddish. 

 The more anterior position of the dorsal fin is one point of difference from 

 R. maxillosus. 



Found abundant at Provo, Utah, in 1872, by Dr. H. C. Yarrow and 

 H. W. Henshaw, to which latter gentleman the species is dedicated. 



The fish which I referred to the Argyreus nulilus of Girard (Hayden's 

 Report, /. c., 472), from Grass Creek, Idaho, may for the present be re- 

 garded as a variety of this species, with rather larger scales ; they number 

 1^62. Radii: D. I. 9 ; A.I. 7. 



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APOCOPE VDLNEEATA, Cope. 

 PLATE XXVI, FIGS. 4, 4. 



Apocope viihierata, COPE in U. S. Geol. Surv. Terr., 1871, 473. 



Tigoma rMnichthyoides, COPE, I. c., 473. 



Alburnellus rhmichthyoides, COPE, Kept. Plagop. & Ickthy. Utah, 1874, 7. 



DESCRIPTION. Size small ; form elongate. Head 4.3 times in length, 

 excluding caudal ; depth 5.2 times in same. Muzzle obtuse, not projecting; 

 mouth inferior, horizontal ; maxillary not reaching line of orbit. Head 

 nearly four times longer than diameter of orbit, which equals length of 



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muzzle, and is 1.5 times interorbital space. Teeth, 1.4-4.1. Scales, jH 



12-14J 



lateral line with occasional interruptions at the posterior part. Dorsal fin 

 behind line of ventrals nearer basis of caudal fin than end of muzzle. 

 Color olive-brown above, yellow below ; a broad brown lateral band and 



