GEOLOGICAL SURVEY OF THE TERRITORIES. 439 



descends gradually to it without projecting; maxillary extending beyond 

 the line of the orbit ; interorbital region convex. 



In general proportions this species is rather elongate, with elongate 

 head and small mouth. Length M. .07. First ventral and dorsal radii 

 opposed and a little nearer the end of the muzzle than the base of the 

 caudal fin. Color above olive, below silver ; a broad silver lateral band 

 with black dots on each side of the lateral line, and a band of specks on 

 the side of the head. A strong black dorsal band. From the North 

 Platte. 



In two smaller specimens, apparently of this species, there are some 

 peculiar differences. In one the back is half scaled, the other entirely 

 scaled, and the count is 6-36-4. The caudal peduncle is a little shorter, 

 so that the dorsal fin has a median position ; and the head enters the 

 length (without caudal) 37 times. From the Bed Cloud Creek. 



Hypsilepis cornutus, Mitchell, Cope, Proceed. Acad. Nat. Sci, 

 Phila., 1867, 158.— Eed Cloud Creek. 



CYPRINELLA BILLINGSIANA, (COPE;) Sp. UOV. 



A rather stout fusiform species, having the depth .25 of the length 

 without caudal fin. Length of head the same ; eye contained in it 3.5 

 times, .75 of interorbital width. Parietal and frontal regions convex 

 transversely. Lips equal ; mouth slightly descending ; maxillary bone 

 reaching line of orbit. Muzzle nearly equal to orbit's diameter. Scales, 

 6-31-3. Eadii, D. I. 8 ; A. I. 8 (9 ;) V. 8 ; originating considerably in ad- 

 vance of line of dorsal fin ; not reaching vent. Pharyngeal teeth 4.1-1.4. 



Color in alcohol reddish above, i. e., transparent in life; sides and 

 operculum silvery. A faint median dorsal shade ; no spots on fins or at 

 base of dorsal. Total length, M. 048 ; end of muzzle to dorsal fin, .021. 

 From St. Joseph, on the Missouri Eiver; Dr. "William Stimpson. 



This fish differs from all those referred to Cyprinella by Girard, in 

 proportions, radial or scale formula, excepting the C. lugubris, Girard. 

 This species differs in having the dorsal fin above the ventrals, and in 

 the upper regions of the body being dark brown. Dedicated to Joshua 

 Billings, author of original observations on "The Briny Codfish." 



MONTANA JUGALIS, (COPE ;) sp. UOV. 



Form stout, back much elevated, descending steeply to the end of 

 the muzzle. Head one-fifth of total with caudal fin ; depth one-third 

 without caudal fin. Eye 4.3 and four times in head's length, .6 of inter- 

 orbital space. Upper lip a little more prominent than lower ; end of 

 maxillary bone falling behind the line of the margin of the orbit. 

 Pharyngeal teeth 4-4 in adults; 4.1-1.4 in small specimens. Scales 

 with narrow exposed surfaces, 7-34(3)-4(3.) Eadii, D. I. 8 ; A. 1. 9 : V. 8, 

 reaching anal, and originating well in front of line of first dorsal spine. 

 Pectorals nearly attaining ventrals. Total length, M. .0665 ; to dorsal 

 fin, .03 ; depth at lasfc anal ray, .009. 



Sides and ventral and anal fins, milky white ; a median dorsal shade, 

 a broad vertical bar behiud the head, and an undefined shade on the 

 side between origins of ventral and anal fin, of a sooty color. From 

 St. Joseph, in Northwestern Missouri ; Mus. Chicago Academy Sciences. 



This species is well distinguished from those described by Girard in 

 the reports of the United States commissions on the Pacific Eailroad 

 and Mexican boundary surveys. Thus, in the allied M. leonina, Girard, 

 the depth is .25 the length ; in M. laetabilis and M. deliciosa, Girard, the 



