94 THE WASATCH AND BEIDGER FAHN^. 



Measurements. 



Total length 217 



Length of head 0G4 



Length to line of first spine of first dorsal 070 



Length to line of first spine of second dorsal 121 



Length to line of anal 122 



Length to baKC of caudal 173 



Depth at first dorsal spine 093 



Depth at tirst dorsal soft ray 070 



Depth of caudal peduncle 027 



Length of fourth dorsal spine ^ 03© 



Length of second anal spine 027 



This species is about the size of the Crappie, Pomoxys annularis. Not 

 rare at Twin Creek, Wyoming. 



Priscacara ctpha Cope. 



BuUeHn U. 8. Geol. Surv. Terrs., 1877, p. 817. 

 Plate Xni, fig. 2. 



This species is nearly related to the last, but presents a number of 

 differences which require its separate consideration. These are: (I) The 

 more arched or convex dorsal outline; (2) The relatively longer head ; (3) 

 The presence of an additional dorsal spine; (4) The entire covering of the 

 operculum with scales. There is also probably a smaller number of dorsal 

 vertebrae, but this is not certain, as that region has been somewhat disturbed. 

 Foi-mulse:— Rays: D. XI— lU— 11; A. 111—9; P. 15. Vertebrae, 6-14. 



The greatest depth enters the totiil length 2.6 times ; the length of the 

 head enters the same 3.3 times. The spines are more robust, and the ser- 

 rature of the preopercle more produced in the individual now described 

 than in any of those of the P. serrata in my possession. The size is about 

 the same as that of the latter species. 



Twin Ci-eek, Wyoming. 



Priscacara oxyprion Cope. 



Bulletin U. S. Geol. Surv. Terra., 1878, p. 74 (Febmary 5). 

 Plat* XIV, fig. 5. 



Five specimens in nearly complete preservation represent this species 

 in our collections. It is more nearly allied to the P. serrata than to the 

 other species, as the spine of the ventral fin is large and robust. It differs 



