1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. ok 
The species is near to U. jugulans, but the jaw is deeper, the premolar 
region more reduced, the molars shorter. The upper jaw shows p*-m? in 
good preservation. P* has the inner cusp comparatively small and anterior 
in position, and the anteroexternal cusp is stronger than in other species, 
approaching Viverravus. The molars also approach Viverravus in con- 
struction, the protocone lacking the posterior wing, while the anterior wing 
is high and nearly continuous with the strong protoconule as a very marked 
transverse crest. Unlike Viverravus the paracone and metacone are of nearly 
equal size, and parastyle only moderately extended. ‘The second molar 
has very little parastyle, the external shelf is rather narrow and is practi- 
cally absent outside the metacone. Presence of m? is not demonstrated. 
Uintacyon massetericus rudis mut. nov. 
Type, No. 16855, a lower jaw fragment from Sand Coulée horizon in Clark 
Fork Basin. | 
Distinctive characters: M, smaller than in the type, the trigonid more distinct 
from talonid and higher; talonid smaller. 
This is a primitive stage of Cope’s species with the carnassial and tuber- 
cular dentition less sharply differentiated. Nos. 16750 and 16751, from the 
Systemodon zone are intermediate between this and typical massetericus. 
w 
Measurements. 
No. 16231, New Mex. 
No. 15719, Gray Bull 
No. 16750, Gray Bull 
Type, No. 4250 
No. 15647, Lysite 
in en 
i a ni i et et 
Total length of jaw, canine to condyles.............| 67 
Lower Diemer ee eh ee ees ee a 17.9 
Lower miele oe es ee Ta ee Ree 13.8 
Upper tect tie tits scores a ey eae 
P4 anteropesterier Ga mevetnc oi iice) Sa lieilaae 
6.6 
8.5 
‘SS pani Sey etn x Pea MC SIL UREA he POCA 5.0 
M4 anteramasteronie. £5 oi tact aoe Fae 5.5 
8.0 
B24 
520 
— 
‘* transverse LPN ee nau Dat YA NE Oe Ravi hy 
M2 anteroposterior oc Oi hut ceeds 
p6 tanger mean. Ori ines Canevari nies bi adantbal abheg aa 
ww Fis 
