34 OREODON. 
At the inner side of the entrance of the infra-orbital canal, are two foramina, 
homologous with the posterior palatine and spheno-palatine foramina. 
Another foramen, the anterior orbital, is situated in the suture between the 
lachrymal and palate bone, about half way between the entrance to the infra-orbital 
canal, and the lachrymal margin of the orbit. 
The foramina spheno-orbitale and rotundum, form one large and vertically oval 
foramen, which is situated just within the pyramidal process forming the terminal 
conjunction of the temporal and pterygoid surfaces. 
The optic foramen is situated some distance in advance of, and slightly above 
the position of the spheno-orbital, is about one-third the size of the latter, and is 
also vertically oval. . 
The bones which contribute to the construction of the orbit are the lachrymal, 
frontal, superior maxillary, malar, palatal, and anterior sphenoid. 
form, Relations, and Connections of the Bones of the Skull—The occipital bone 
posteriorly, is trilateral with a prominent apex, and it terminates by its other angles 
in the long paramastoid processes. 
The lambdoidal suture commences at the outer side of the base of the latter, and 
ascends posteriorly between the occiput and the process from the pars petrosa, and 
then advances over the occipital crest to the side of the cranium between the occipital 
and parietal bones. It is serrated, and at the occipital summit it forms a trifoliate 
line. 
The spheno-basilar connection is not obliterated in the adult specimens under 
investigation, but is elevated and distinct. 
As in the Camel, the squamous portion of the temporal bone, from its great 
relative size to that of most other animals, is a striking feature in the anatomy of 
the temporal fossa. 
The squamous suture forms about three-fifths of an oval outline, and is pretty 
strongly serrated as in ruminants generally. 
Between the pars squamosa and the occiput posteriorly, is a narrow process from 
the pars petrosa, ascending from between the mastoid process and the base of the 
paramastoid, to the conjunction of the occipital with the parietal bones. To the 
pars squamosa and occiput, it is connected by serrated suture. 
As in all ruminants, there is only a single parietal bone; and, as in the Camel, 
this is remarkable for its length in comparison with that of more ordinary mem- 
bers of the family. It is narrowest posteriorly, and gradually widens to the ante- 
rior portion of the squamous suture, where it descends to the wings of the post- 
sphenoidal bone. Anteriorly it is deeply notched for the reception of the posterior 
part of the ossa frontis. 
The body of the post-sphenoidal unites with that of the ante-sphenoidal on a 
line with the spheno-orbital foramina. 
The wing of the ante-sphenoidal bone articulates with the vertical plate of the 
palate bone, the frontal, a small portion of the parietal, and the wing of the post- 
sphenoidal bone. 
The external pterygoid process is united with the internal, as in the Sheep and 
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