96 THE WASATCH AND BRIDGER FAUNiE. 



the distance from the vertebral column to the dorsal outline. It disappears 



behind the vertebral column below the seventh soft dorsal ray, and does not 



reappear. 



This fish came from a deposit of the Green River Shales on Twin Creek, 



Wyoming. 



Priscacara clivosa Cope. 



Bulletin U. 8. Geol. Snrv. Terra., 1878, p. 76. 

 Plate XIU, fig. 3. 



In the last-named fish, there are eight dorsal and fourteen caudal ver- 

 tebrae. Radii: D. X — 13; A. Ill — 11. The ventral fin appressed, nearly 

 reaches the base of the anal, a point in which it difi'ers materially from the 

 two allied species. Another characteristic is the form of the profile, which 

 resembles that of some of the species of Geophagiis. This descends steeply 

 from a point just anterior to the base of the dorsal fin, giving an obliquity 

 to tliat part of the outline, and an inferior position to the mouth. The ver- 

 tebral column is more arched anteriorly, appropriately to the prominence of 

 the anterior dorsal region. The depth at the base of the first dorsal fin 

 enters the total length (with caudal fin) 2.6 times, and the length of the 



head 3.6 times in the same. 



Measurements. 



it. 



Totallength 115 



Axial length of head 032 



Axial length to line of first dorsal 032 



Axial length to origin of ventral fin 041 



Axial length to origin of anal liu - 057 



Axial length to origin of second dorsal fin 056 



Axial length to origin of caudal fin 082 



Depth of caudal peduncle 016 



The preopercular border is not visible in the only specimen of this 

 species known to me. The operculum is scaly. There are 11-13 rows of 

 scales on a line from the vertebral column to the abdominal border. 



Twin Creek, Wyoming. 



Priscacara pea lei Cope. 



Ballotin U 8. Geol. Surv. Terrs., 1878, p. 75. 

 Plate VIII, fig. 4 ; XIV, fig. 4. 



Outline elliptic, with the extremities contracting equally or symmetri- 

 cally to the head and tail. Depth at ventral fins entering length (with 



