(IREODONTA. 
97 
bone rises in a strong postorbital process, partially inclosing the orbits, as 
in the Cats. 
The head of the humerus in 0. morsitans exhibits a rather large greater 
tuberosity and small lesser one. The spine of the scapula rises abruptly 
near the glenoid cavity. In a fragmentary skeleton of probably the same 
species, a portion of the ilium is preserved. It exhibits a tuberosity above 
the'acetabulum which represents the “anterior inferior spinous process” of 
human anatomy, and is larger than in the existing genera Ursus, Canis, 
and Fells. The middle of the shaft of the femur is wanting in all our 
specimens of this genus. The proximal portion of that of 0 . morsitans is 
wide and flat, and has a large great trochanter about equal in elevation to 
the head, which does not inclose a deep or large fossa. The fossa for the 
ligamentum teres is at the fundus of a deep emargination of the rim of the 
head. The distal part of the femur is flattened as in AmMoctonus, and the 
patellar groove is not elevated as in Stypolophus viverrinus., but wide, 
although less so than in the Bears. 
The distal end of the tibia of probably 0. morsitans exhibits the 
ungrooved astragalar surface of the other OxycenidrE., with abruptly pro¬ 
jecting internal malleolus. Its border is less regular than in the genera 
described. The outer extremity is not truncate, but gives rise to a longitu¬ 
dinal external ridge of the lower part of the shaft, and there is a tuberosity 
on the posterior and one on the inner aspect of the lower extremity. The 
posterior as well as the anterior astragalar border is angulate at the base of 
the malleolar process. The ligamentous grooves are shallow, I have no 
astragalus of this genus, but the proximal part of a calcaneum displays the 
usual two astragalar facets. It is remarkable for the obliquity of the facet 
for the cuboid, which presents upward as well as forward (when in the 
supine position). The calcaneum is wide, especially in its postero-inferior 
face, and the posterior free portion is narrow and oblique, indicating a plan¬ 
tigrade habit. Its flatness exceeds that in Ursus arctos, and the expanse of 
the anterior portion is similar to that genus, while greater than in Canis and 
Felis. The obliquity of the cuboid facet is not seen in either of the recent 
genera named. Numerous phalanges have been obtained, but none of 
them ungueal. They are depressed, with their distal articular facets slightly 
7 G E 
