76 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Measurements. 



M. 



Total length -' 0.130 



Axial length of bead 0,035 



Axial length to first dorsal spine 0.038 



Axial length to first dorsal soft ray 0.062 



Axial length to first anal spine 0.070 



Axial length to base of caudal fin 0. 103 



Depth at orbit - 0.025 



Depth at first anal spine 0. 041 



Depth of caudal peduncle - 0.016 



Length of fifth dorsal spine 0.018 



This species is similar in size and proportions to the Priscacara Hops, 

 but differs in having constantly but seven dorsal or abdominal verte- 

 bra), while that species presents nine. I have not observed any serra- 

 tures on the preoperculum of the P. Hops, but the typical specimens are 

 imperfect in that region, although good impressions of it remain on the 

 matrix. 



Two complete specimens present all the characters of this species, 

 while in two others all the more important ones can be seen. Two 

 additional specimens may be referred to it with the greatest proba- 

 bility. Some of these were obtained by Dr. A. G. Peale, in charge of 

 one of the parties under Dr. F. V. Hayden, from the shales of the Green 

 Eiver formation of Wyoming. The species is dedicated to Dr. Peale, 

 in recognition of his services to geological science. 



Priscacara clivosa, sp. nov. 



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

 the ventral spine is very sfrong, and there are but ten or eleven soft 

 dorsal radii: here belong P. serrata, P. cypha, and P. oxyprion. In the 

 second, the first ventral spine is weak and slender, and there are thir- 

 teen or fourteen radii of the second dorsal fin : in this division belong 

 P. liops^ P. pealei, and P. clivosa. 



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

 tebrae. Kadii: D. X — 13 5 A. Ill — 11. The ventral fin appressed, nearly 

 n-aches the base of the anal, a point in which it differs materially from 

 the two allied species. Another characteristic is the form of the pro- 

 file, which resembles that of some of the species of Oeophagus. This 

 descends steeply from a point just anterior to the base of the dorsal fin, 

 giving an obliquity to that part of the outline and an inferior position 

 to the mouth. The vertebral column is more arched anteriorly, appro- 

 priately 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. 



M. 



Total length. 0.115 



Axial length of head - 0. 032 



Axial length to line of first dorsal ..........> ........^. 0.032 



