0. C. Marsh—New Tertiary Mammais. 208 
ront. The zygomatic process of the squamosal is proportion- 
ally more massive than in the lion, although similar in form. 
Measurements. 
rena 5 SR eer ee 
This interesting specimen was found, in September last, by 
Mr. J. F. Page, of the Yale party, near Henry’s Fork, Wyoming. 
The geological horizon was Eocene, or Lower Miocene. 
Limnofelis latedens, sp. nov. 
A second very large carnivore, but inferior to the preceding 
'N size, is indicated by a last upper premolar, and probably by 
some other fragmentary remains. This premolar is unusuall 
2road, and is remarkable for its large posterior tubercle, whic 
‘Ss two-thirds the size of the main cusp. The anterior tubercle 
= very small. On the outer face there is a well-marked basal 
tidge! ‘The crown is 165" in longitudinal diameter, 11" in 
transverse diameter, and 15™ in height. Another specimen, 
“pparently of this species, is the left lower jaw of a young in- 
dividual. It contains the canine, and three molars, the last of 
_ Which is still nearly enclosed in the jaw. The space occupied 
Y the three molars is 46™™. 
€ only known remains of the species were discovered by 
Mr. G. M. Keasbey and the writer, last autumn, in the Tertiary 
beds of Grizzly Buttes, near Fort Bridger, Wyoming. 
Limnocyon riparius, sp. nov. 
physis is elongated, and the rami were but slightly codéssified, 
here were six teeth behind the canine, all close together and 
each with two fan he last two 
canine was large, and near the symphysis. 
