48 OREODON. 
half lines in extent existed between the canines and incisors, but in the specimen 
under inspection no hiatus existed in a corresponding position of the lower jaw, 
the lateral incisor having been in contact with the canine. (Plate II. Fig. 2.) 
From the collection of Dr. David Dale Owen. . . 
MEASUREMENTS. 
Inches. Lines. 
Breadth of face at infra-orbitar foramina ; F : is . eel 64 
Breadth of face above first premolar. . 0 : : : seal 3 
Distance from infra-orbitar foramina to frontal ammell processes. : aol 4 
Breadth of ossa nasi at the points of the latter processes . : : : 83 
Length of series of upper molars 3 4} 
Length of series of lower molars : 3 4 
Length of series of upper true molars .- 1 10 
Length of series of lower true molars 2 $ 
10. A skull with the anterior extremity of the nose, the zygomata, and summit of 
inion broken away. The forehead is slightly crushed, but otherwise the specimen 
is comparatively well preserved. It contains all the molar teeth of both sides, the 
left canine, and the fang of the right canine. A small fragment of the right side of 
the lower jaw, containing the true molars, accompanies the former specimen. 
The skull I suspect to have belonged to a male individual of Oreodon Culbert- 
soni, on account of its generally more robust character than most of the others 
which have been indicated; and specimen 9, particularly, I suppose to have 
belonged to a female. 
Besides the relatively greater degree of robustness of the male skull of Oveodon 
Culbertsonii, the face is depressed or flattened above, or is not so much arched as 
in the female, and in transverse section it has a more square than conoidal appear- 
ance, as in the latter. The molar teeth, also, are more robust, and the true molars 
possess a well-developed ridge between the bases of the external columns or but- 
tresses, and a feebler ridge exists externally at the base of the premolars. The 
canines are a little more robust, a little longer, and project a trifling degree more 
outwardly. 
In the specimen under immediate inspection, the supra-orbitar foramina are nearer 
the centre of the forehead on each side than in any of the preceding. 
The parietal region on one side of the sagittal suture presents an irregularly 
eroded and areolated vascular appearance, with several slight thin exostoses, indi- 
cating inflammation to have existed during the life of the animal. (Plate HI. 
Figs. 1, 2.) 
From the collection of Dr. Owen. 
MEASUREMENTS. 
Inches. Lines. 
Breadth of face at infra-orbitar foramina. : : : . : abe 7 
Breadth of face above first premolar. ; : 5 : cosa 7s 
Distance from infra-orbitar foramina to frontal Aeon processes. : aaly aol 4 
Breadth of ossa nasi at the ends of the latter processes . 93 
Length of series of upper molars 3 7 
—_—e 
