0. C. Marsh—Notice of new Tertiary Mammals. 408 
Dromocyon vorax, gen. et sp. nov. 
A new and remarkable carnivorous mammal about the size 
of a large wolf is represented in the Yale Museum by a nearly 
complete skeleton In the form of the skull, and general 
character of the jaws and teeth, the genus resembles EHyeenodon. 
n the present specimen there were apparently but two lower 
T 
ported an enormous sagittal crest. The brain was small and 
convoluted. The lower jaws are long and slender, and the 
condyles low. 
The femur has a small third trochanter and the astragalus a 
facet for the cuboid. There were but four toes in front, and 
four behind. 
Some of the more important dimensions of this skeleton are 
as follows : 
0: mms 
Extent of WWer wmeblar fories... 22 
mere Sntee truc molars _....... 2 70° 
Antero-posterior diameter of last lower molar___.._...-- 15° 
Transverse migineter... 8 9° 
Length of third metacarpal so. 260k. Soe 78° 
Length of third metatarsal ee ear eee 
The remains of this species at present known, are from the 
Eocene of Wyoming. 
Dryptodon crassus, gen. et sp. nov. 
The present genus belongs in the order Tilodontia, and is 
based upon 
pesrently most nearly allied to Stylinodon. It is bas 
€ nearly perfect lower jaws, with most of the teeth preserved, 
some fragmentary remains of the skeleton of the same 
- These specimens indicate an animal nearly as 
age asa Tapir. The lower jaws are very short, and massive, 
pecially in the anterior portion. In each ramus there were 
forming a continuous series. Three of these are 
late wiately behind this a series of six similar molars. The 
te cylindrical, and their sides nearly or quite covered 
inci mmel. ree are apparently premolars, and the large 
Sor extends beneath them. 
