98 THE WASATCH AND BRIDGER FAUX^. 



centrida:, i. e., the preopercular border is entire. It conforms closely to the 

 P. serrata in other resi^ects, as the form of the dorsal fin, three anal spines, 

 form of caudal fin, character of scales and lateral line, edentulous jaws, 

 and, indeed, in form to such an extent as to lead me to suspect that in this 

 genus, as in Lepomis, etc., the seri-ation of the prcopercle is not of much 

 systematic value. One character by which the P. Hops may be distinguished 

 from P. serrata, in addition to the smooth preoperculum and small size, is 

 the constantly larger number of rays in the second dorsal fin. 



Formula?:— Rays: D. X— 13-14 ;C. 5—19—6; A. III. 10-11. Verte- 

 bra;: D. 9; C. 13. The pectorals originate below the first dorsal spine, and 

 the ventrals a little behind it. The spines are moderately stout, and the 

 emargination of the dorsal fin is not deep. There are twenty -five rows of 

 ctenoid scales traversed by a vertical line from the middle of the spinous 

 dorsal, and smaller scales cover the operculum and more or less of the pre- 

 operculum. 



Measurements. 



u. 



Total length 113 



Length of head 0;!"3 



Length to firat dorsal spiuc .0:54 



Length to first dorsal soft ray 0.'>7 



Length to first anal spine 0r>7 



Length to base of caudal 086 



Dei)th at orbit 0:iO 



Depth at first dorsal spine Ol:J 



Depth at first dorsal soft ray 035 



Depth of cauilal peduncle 014 



Two specimens of this fish have been received from Twin Creek. Tliey 

 are somewhat injured, and it is possible that better specimens will show 

 minute serrations of the preopercle. 



Priscacara testudinaria Cope. 



Plate I, fig. 7. 



My best specimen of this fish is without the greater part of the skull; 

 othenvise it is nearly complete. Under the circumstances it is difficult to 

 make a final generic reference, but as the parts jireserved are identical witli 

 those included in the definition of the genus Priscacara, I refer it here for 

 the present. 



The specimen is larger than those which I have seen of the other 



