OREODON. 31 
in the Camel and Anoplotherium; whereas, in the Deer, and other ruminants, it is 
beneath the anterior part of the orbit. (II. 1, 2.) 
Internal to the position of the malar bone, the face is deeper than in Anoplothe- 
rium, but relatively is not as deep as in the Camel. 
The infra-orbitar foramen is placed above the position of the third premolar, and 
is more advanced than in the Anoplotherium or Camel, but is less so than in the 
Deer, Ox, Sheep, and other ruminants. The face, from the post-orbital arches to 
the nose, constitutes very nearly an equilateral triangle, being relatively broader 
between the post-orbital arches, or at the base of the triangle, than in Anoplothe- 
rium. The side of the face, in advance of the orbit, is vertically convex, and 
one of the most remarkable features of the genus exists upon this surface, viz., a 
large lachrymal depression gradually gommencing at the borders of the bones in 
sutural connection with the lachrymal bone. This depression is rather more 
elevated in its position than in the Deer, and is hemispherical, as in the extinct 
genus of pliocene Oxen, the Bootheriwm. Anterior to the infra-orbitar foramen 
the face is slightly depressed, and just in advance of this position is a gentle rise, 
corresponding to the course of the fang of the canine tooth. 
The lateral view of the extremity of the nose resembles more that of the Anoplo- 
thertum than of any existing ruminants, presenting the same slope lateral to the 
convex termination of its floor, which is constituted by the incisive alveoli. The 
intermaxillary bone, however, is very much smaller than in this genus, projecting 
as it does at the lateral margin of the nose only very slightly beyond the end of 
the maxillary, and at the incisive alveoli a very small distance relatively beyond 
the anterior line of the canine tooth. (II. 1.) 
Superior View—(P1. IV. Fig. 1; V.4; VI. 1.) The upper view of the cranium 
proper, much resembles that of the Camel. The sagittal crest is prominent, and 
pyramidal, with concave sides; and it bifurcates immediately at the position of the 
coronal suture. The forehead generally is convex; and it has very nearly the 
form of that of the Camel, but it is less prolonged outwardly towards the orbits, and 
is not so prominent above these, and also is relatively not quite so much depressed 
at the bifurcation of the sagittal crest. 
The supra-orbitar foramen varies in its exact position in different individuals, but 
is usually situated a short distance from the frontal suture, and nearer to the fronto- 
nasal, than to the coronal suture. It is directed forward, and is continuous with a 
shallow groove passing to the outer side of the fronto-nasal suture. (IV. 1.) 
The muzzle is relatively short, as in Anoplotherium, and superiorly is usually 
transversely convex, with the sides vertical; but in some specimens it is nearly flat 
at the nasal bones. 
As far as can be ascertained in any of the specimens, but principally from an im- 
pression upon a portion of matrix, the anterior extremity of the nose, as constituted 
by the ends of the ossa nasi, appears to have been like that of the Deer; and the 
lateral margin and incisive alveoli are convex; and the latter project relatively 
to their position in Anoplotherium, or recent carnivora, very little beyond the front 
of the canines. 
Posterior View.—(P1. IV. Fig. 2.) The occipital surface resembles a good deal 
