92 TOE WASATCn AND BKIDGER FAUN^. 



MioPLOSus SAUVAOEANUS Cope. 



This fish is known to me by a single specimen of the average size of 

 the M. lahracoides. It is distinguished from that species by its more slender 

 proportions, and especially by the elongation of its muzzle, which projects 

 a little beyond the lower jaw. In M. lahracoides it is the inferior jaw 

 which projects. M. sauvageanus also differs from all the known species of 

 the genus in the small number of its soft anal rays, and larger number of 

 its vertebra. 



Radial formula; D. VI +, 14; A. I, 9. Vertebrae, D. XI, C. XVI. 

 Depth at middle of first dorsal fin (the greatest) enters the length to the 

 extremity of the vertebral column, 3 5-G times, that is, nearly five times in 

 the total length. In M. lahracoides this dimension enters the same length 

 three times or a little over. The dentary bone is quite shallow, and the chin 

 and inferior crests are less prominent than in M. lahracoides. The inferior 

 preopercular teeth are distinct. 



From the Green River shales of Twin Creek, Wyoming, from Mr. 

 Leroy, of the Central Pacific Railroad. 



Dedicated to my friend Dr. H. E. Sauvage, of Paris, author of various 

 important works on ancient and modern fishes. 



PRISCACARA Cope. 



Bulletin U. S. Geol. Surv. Terrs., 1877, p. 816. 



This type might be included in the Pomacentrida;, but it differs from 

 the genera now known in the possession of vomerine teeth, and apparently 

 in having eight branchiostegal rays. 



In general, Priscacara may be characterized as Pharyngognathi, with 

 ctenoid scales and well-developed spinous rays. The preoperculum is, in the 

 typical species, sharply seiTate on both free borders. There are three anal 

 spines, and the lateral line is well developed, not extending near the dorsal 

 line. The caudal fin is rounded. The jaws are toothless. The pharyngeal 

 bones, both superior and inferior, are closely studded with short, sessile, 

 conical, teeth; a row of small ones stands on the external border of the 

 inferior pharyngeal. One dorsal fin. 



The species of Priscacara are referable to two sections. In the first, 



