60 ARCHAEOTHERIUM. 
The former is relatively broad compared with that of the Hog and Peccary, and in 
this character and in its form is more like that of the Camel. 
The sagittal crest at its bifurcation is, to an extraordinary degree, strong and 
prominent, and the fronto-temporal ridges leading from them are at first elevated 
and acute, but afterwards decline and become irregular in their course outwardly. 
The forehead presents a rugged appearance; is prominently convex on each side 
above the orbits, and is deeply depressed in the middle. In the greater part of one 
side remaining in the specimen, over the orbit, are two small vasculo-neural fora- 
mina; and near the middle line and the fronto-nasal suture, is a fronto-orbital 
foramen, which is relatively very small to that of the Hog or Peceary. The face 
has the form of a demi-cylinder very slightly convergent forward. Its upper part 
in the latter direction forms a very slightly concave slope similar to that existing 
in the same position in the Dicotyles labiatus. 
Posterior View.—(Pl. X., Fig. 6.) The inion forms a broad triangle, from the 
middle of the base of which the occipital condyles project downward and backward, 
and these have very nearly the same form and relation to each other as in the Hog. 
Above the condyles the occiput forms two vertical convex prominences separated 
by a concavity which extends to the summit of the inion, as in the Hog and Pee- 
cary, but is deeper than in these. Laterally, the inion is depressed into a deep pit, 
at the bottom of which is a large foramen communicating with the interior of the 
cranium, as in the Camel. 
Inferior View.—(P1. VII., Fig. 1.) The base view of the skull bears consider- 
_ able resemblance in its form to that of Choeropotamus ; but posteriorly it is relatively 
broader, from the greater degree of extension outwardly of the zygomata. 
The basilar process is demi-cylindroidal, convergent anteriorly, and terminates in 
two lateral abutments, which rest against a corresponding pair extending as lateral 
ridges from the post-sphenoidal body. 
The post-sphenoidal body at its middle forms a concave gutter, and anteriorly 
terminates at the orifice of a very large azygous canal, which also exists in the 
Hog, but in a relatively feebly developed condition. 
The anterior condyloid foramen occupies a position at the bottom of the concave 
lateral portion of the basilar process, a few lines in advance of the condyle. 
In front of the latter foramen is a large, irregularly crescentic foramen lacerum, 
which surrounds the inner side of the auditory bulla. 
The foramen ovale is situated in front and at the extreme bottom of the zygo- 
matic root. The foramen spheno-orbitale is placed about three-fourths of an inch 
in advance of the ovale, is circular, and is bounded externally by a prominent 
acute ridge, which curves upward and forward, and constitutes the antero-inferior 
limit of the temporal fossa. 
The optic foramen is relatively about as large as that in the Hog, and is situated 
about three lines anterior to the one last described. 
The homologues of the paramastoid processes or the inferior angles of the occiput 
are thick and strong, and are prolonged in a curvilinear manner outward and 
downward. In the specimen they are broken at their extremity, and they are 
associated with the mastoid processes, considerably external to the position of the 
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