O. C. Marsh—New Tertiary Mammals. 409 
Oreodon occidentalis, sp. nov. 
Incisors 3 canines 7, premolars re molars 3 Xx 2=44. The 
caniniform tooth of the lower jaw is clearly the first premolar, 
as Dr. Gill has stated. The metacarpals are slender, and those 
In O. Culberisoni are about twice as long as those in Dicotyles 
torquaius. The first is wanting. The third and fourth are 
nearly equal in size, and had their coadapted faces immovably 
united by cartilage. The second and fifth are both well devel- 
oped. The navicular and cuboid bones were loosely codssified, 
or separate. T’he phalanges are much more slender than in the 
ecca: 
The following are some of the dimensions of a large specimen 
0S. 
of Oreodon occidental 
Measuremenis. 
Space occupied by last three upper molars, .--.-------- 454 
tero-posterior diameter of last upper molar, .--- ---. - 15 
Extent of lest. throe lower moplart, ... .. 6.2... 2... -- 53° 
Distance between outer faces of postglenoid processes,.. 77° 
Length of frontals on median suture,.-.. ..-- ---------- 54° 
Vertical diameter of auditory bulla,....-.----- ee 22° 
e type specimen of this species was presented to the Mu- 
Seum of Yale College by Rev. mas Condon, who has done 
80 much for the experi! of Oregon. Other specimens 
were collected by the Yale party in the autumn of 1871. 
Rhinoceros annectens, sp. nov. 
_ There are two well-marked species of Rhinoceros represented 
in the Yale collections from the Miocene of Oregon. One of 
these Dr. Leidy has called R. pacificus ;* the other appears to be 
undescribed. “It was apparently about half the bulk of the 
former species, which it resembles in some of its dental charac- 
ters. In the upper molars, however, the transverse crests ap- 
proach each other much more nearly, and in the true molars 
preserved they are united, thus dividing the interposed valley. 
* Proceedings Philadelphia Academy, 1872, p. 248. 
