1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 455 
I refer to this species jaw fragments of six individuals, Nos. 14665-14670, 
from the same horizon and locality as the type. In No. 14670 the last upper 
Nx 
Fig. 26. Shoshonius cooperi, lower jaw, outer and inner views, and crown view of teeth, 
Lost Cabin beds, Wind River basin, Wyoming. 
and last lower molar are associated. The others show only the lower molars. 
The lower premolars are unknown. 
Uintanius gen. nov. 
Type, U. turriculorum infra from the Middle Eocene Bridger formation of 
Wyoming. 
Ft 17 3.2 ‘ 
Generic characters: Dentition ries Jaw short, deep anteriorly. Premolars 
enlarged, crowded, with compressed trenchant crests; deuterocones on upper pre- 
molars vestigial, no deuteroconids on lower premolars. Upper molars tritubercular 
with small conules, no distinct hypocones, no mesostyles. Lower molars with dis- 
tinct median paraconid, metaconid set more posteriorly than protoconid, especially 
upon m;, m# little reduced; entoconid of m; distinct. Enamel smooth or faintly 
wrinkled. 
¥ 
J 
This genus appears to be limited to the Bridger formation, and I have not 
recognized any Lower Eocene ancestors. It parallels ‘Absarokius in the 
enlargement of the premolars, but the form of these teeth is quite different, 
and the molars are of very distinct pattern. The alveoli indicate a lower 
canine of moderate size and a small incisor in front of it, the other incisor 
if present was also small. 
