PANTODONTA. 
193 
base, and issues near the middle of the inferior face. It does not return 
through the transverse process, as in the Tapir, but the latter is not 
expanded anteriorly, as in that animal. The foramen attantis, by which the 
vertebral artery enters the foramen magnum, is well isolated by the osseous 
border, as in many other Mammals. The axis is distinguished for the length 
of its odontoid process, which is without groove superiorly. 
The lumbar vertebrae exhibit the same depressed and moderately 
opisthoccelous centra, presented by the cervicals. They are longer than the 
latter, but not longer than wide, and are not keeled beneath, but are pierced 
with foramina. The neural canal is large. The anterior zygapophyses pre¬ 
sent their faces inward above and upward at the base, having a concave 
surface. The caudal vertebrae are characterized by the presence of two 
transverse processes, one obtuse, at the anterior articular face, the other 
flat, at the middle of the length. The terminal vertebrae are slender. There 
are no surfaces for chevron-bones, but angles corresponding to them. 
The ribs are flattened, and have the usual capitular and tubercular 
faces. The haemapophyses are ossified. The sternal segments differ in 
form in the different species, being more cylindric in some than in others. 
I have described* a manubrium as having a somewhat T-shaped form, with 
subcylindric body, in Corypliodon radians. Some loose segments in the 
New Mexican collection are longer than wide, but flattened, while others 
are plate-like and subquadrate. The last are supposed to belong to the 
Corypliodon latidens. 
Seapular arch and anterior limb. —The scapula, in its general form, is more 
like that of the Proboscidians than any other order. Its superior border is 
produced into an angle beyond and in the line of the spine. The spine 
rises abruptly from the neck. All the New Mexican specimens have the 
coracoid broken off, but in some of those obtained by Dr. Hayden on Bear 
River, Wyoming, it is preserved.! I have described it as consisting of a 
prominent hook, which originates a little outside of the edge of the glenoid 
cavity, and incloses a groove between itself and a tuberosity on the edge of 
the latter. I have observed clavicles in a fragmentary skeleton described 
*Ann. Eept. U. S. Geol. Surv. Terr., 1872, p. 586. 
t Described in Ann. Eept. ij. S. Geol. Sarv. Terr., 1872, p. 586. 
