ALBURNELLUS? sp. 



Scales TT. Anal radii I. 8 7. Teeth 2.4 4.2 without grinding face. 

 From Beaver River, Lake Utah, and the Rio Grande, in Colorado. 



Tigoma rhimchthyoides, Cope. AlburneHus rhinichtJiyoides, Cope, Hay- 

 den's Ann. Report U. S. Geolo. Survey, 1871, p. 1473. 



Teeth 1 . 44. 1 . Scales -^f- 



Abundant at Provo. 



CLINOSTOMUS HYDBOPHLOX, Cope. 

 In Hayden's Geol. Survey Terrs., 1871, p. 475. Abundant. 



CLINOSTOMUS T^ENIA, sp. nov. 



A smaller species than the last, distinguished by the smaller number 

 of anal radii, the elegant coloration and other characters. Body of 

 average proportions, its depth entering the length without caudal fin four 

 and one- third times, and exactly equal to the length of the head. The 

 head is compressed and the lips equal : the mouth is oblique, the 

 end of the maxillary attaining the anterior line of the orbit. The orbit 

 is large, entering the head three times and a fifth, and equalling the 

 width of the convex interorbital space. Scales if, thirty-three in front 

 of dorsal fin ; lateral line complete, deflexed between pectoral and ven- 

 tral fins. Radial formula D. I. 9 . A. I. 10 ; V. 9 ; P. 11 ; reaching 

 ventrals, which reach vent. Dorsal first ray equidistant between the 

 basis of the caudal and the anterior nostril. 



Total length .073 ; do. to anal fin .042 ; do. to ventral .031 ; do. of head 

 .014 ; do. to orbit .0036 ; width to posterior nostrils .004 ; do. at middle 

 of pterotic .0062. The sides are pure silvery to the lateral line of pores, 

 above which a blackish vitta extends from the end of the muzzle to the 

 caudal fin. Above this is a narrow very white line which extends to the 

 base of the caudal fin, and above this the entire dorsal region is blackish. 

 Fins unspotted. 

 Numerous specimens from Provo, near the Lake, (No. 666, S.) 



RHLNICHTHYS HENSHAVII, sp. nov. 



An elongate species with small scales and overhanging but obtuse 

 muzzle, resembling a Ceratichthys of the group of C. nubilus (Rhinich- 

 thys,) 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 iuterorbital 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 base of the ventrals. Radii, D. I. 9; A. I. 7; V. 8; 

 P. 12. Scales i|. Color white with a few dark clouds on the caudal 



