1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 5a) 
A. M. No. 107, there is a considerable series of well preserved lower jaws, 
some of them associated with upper jaws, and a few with parts of the 
skeleton; and a larger number of fragmentary specimens. These vary con- 
siderably in size, in robustness of teeth and depth of jaw and various other 
characters. 
Oxyena gulo sp. nov. 
Type, No. 15199, upper and lower jaws; paratypes, Nos. 15725, upper and lower 
jaws, 15193, 15722, lower jaws. All from the Gray Bull horizon of the Big Horn 
Wasatch. 
N Wines ae 
ee ge 
Fig. 47. Oxyena gulo, upper jaw of type specimen, crown and outer views, natural size.. 
Lower Gray Bull beds, Big Horn Basin. 
Distinctive characters: (1) trigonids of lower molars about as long as wide, meta- 
conids and heel of mz moderately large; (2) mi smaller than mz (8) premolars moder- 
ately robust sometimes crowded and set transversely, ps with high protoconid and no 
anterior basal cusp; (4) m! wide transversely, metastyle little extended, m? trans- 
