go ARCHAEOTIIERIUM. 



The former is relatively broad compared Avith 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 Peccary. 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 Dlcotijles lahiatus. 



Posterior Yietu. — (PI. X., Fig. G.) 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 Pec- 

 cary, but is deeper than in these. Laterally, the inion is dej^ressed 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. — (PI. VIII., Fig. 1.) The base view of the skull bears consider- 

 able resemblance in its form to that of Choeropotamiis ; 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-spheuoidal 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 auditoiy 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 



