CREODONTA, 
95 
Measurements. 
Length of the crown. 
Width of the same.. 
Elevation of the anterior basal tubercle. 
Elevation of the central cone. . 
Elevation of the interior cone.. 
M. 
0. 020 
0. 018 
0. 000 
0. 011 
0.010 
This is the largest Carnivore yet observed in this formation, and of 
peculiar character ; its structure indicating a diet not purely carnivorous. 
OXYiENA, Cope. 
Report Vert. Foss. Xew Mexico, U, S. Geog. Survs. W. of 100th M., 1874, p, 11; Id. 
Ann. Report U. S. Geog. Survs. W. of 100th M., 1874, p, 123; System. Cat. 
Vert. Eocene New Mexico, 1875, p. 9. 
3 1 4 2 
Dental formula: I.-L.. n — • Pm. ^ — ; M. —. Two small median 
0 ’ 1 4 2 
superior incisors and a very large external one separated by a diastema 
from the canine. The latter is large, and is followed with little interval by 
the first premolar. The two last premolars and all the molars of the superior 
series with an internal heel; the last molar transverse; third and fourth 
upper premolars with an anterior cone and posterior cutting-lobe; the first 
true molar with two anterior acute cones, the posterior forming a sectorial 
edge with the posterior lobe; last superior molar with a single trenchant 
edge. 
In the mandibular dentition, the canine teeth are directed forward 
and upward without intervening incisors. First premolar one-rooted; 
second and third consisting of an anterior elevated cone and posterior 
heel, which is elevated and trenchant in the middle. The fourth premolar 
is nearly similar, with the posterior tubercle sharp-edged. The two 
true molars with an anterior elevated portion and small, low heel; the former 
consisting of three acute tubercles, of which the largest or exterior forms 
with the anterior, a sectorial blade oblique to the axis of the mandibular 
bone. 
This genus has one less superior molar with double median cone than 
SUjpoloplius; in that genus, I find also in the lower jaw three sectorials of 
the form described, instead of two only. It is one of the group which, 
with Synoplotherium, Cope, presents in its dentition a nearer resemblance to 
