68 



TRANSACTIONS OF WAGNER 



UINTA SELENODONTS 



much compressed crown, which is supported upon two fangs. It entirely 

 resembles the corresponding tooth oi Leptoreodon, except that it is smaller, and 

 this difference may well be sexual rather than generic. The second premolar 

 is much larger than p-; its crown is low, elongate, compressed, and trench- 

 ant, ending in an acutely pointed apex, and of cordate shape in profile, like 

 the premolars of the oreodonts. It is perfectly simple, without basal or inter- 

 nal cusps, and is supported upon two roots. The third premolar is externally 

 very similar to p-2-, but is thicker transversely and is carried upon three fangs ; 

 it has a minute anterior basal cusp. This tooth has suffered so much wear 

 that I cannot determine whether it possessed a deuterocone; if so, it must 

 have been smaller than in Leptoreodon, for the breadth of the crown is notably 

 less than in that genus. The fourth premolar is like that of Leptoreodo7i, 

 except that the external crescent has a more concave outer face, and that the 

 cingulum is decidedly more prominent at the outer angles of the crown, 

 forming minute though distinct buttresses at the points where these are so 

 prominent in p-"^ of Leptomeryx. On the whole, the upper premolars of 

 Caviclovicryx differ from those of Leptoreodon only in minute details. 



The upper molars also closely resemble those of the last-named genus in 

 their shape and proportions, but differ slightly in a few details of construction. 

 They increase in size, especially in width, from the first to the third, and have 

 quadrate outlines, forming transversely placed rectangles, though a slight 

 degree of asymmetry is produced by the somewhat greater breadth of the 

 anterior half of the crown, a difference which is most marked in m^. The 

 first molar, the smallest of the series, is so much worn that its pattern is 



