330 
ARTIODAOTYLA. 
The malar bone is deeply notched to receive the elongate wedge of the 
zygomatic process of the squamosal; its external face is concave. The 
zygomatic process is low, and but. little expanded laterally. 
The otic bulled are especially large, projecting far downward. They 
are tilled with cancellous tissue. They descend vertically from the meatus 
auditori'us much below the basicranial axis, their long transverse axis being 
directed forward and inward. They present a deep, vertical stylohyal fossa, 
opening backward and then outward. The inner wall of this fossa is con¬ 
tinued into the paroccipital process, forming a wall directed outward and 
backward to the apex. The paroccipital process is nearly transverse at its 
superior part where the external margin is rolled forward. It is not very 
long, not quite reaching the line of the inferior borders of the occipital con¬ 
dyles. Superiorly, the plane of its margin rises to the inion, and its poste¬ 
rior border turns backward into the occipital condyle. The middle of the 
space inclosed between the former ridge and the glenoid cavity is pierced 
by the round meatus auditorius externus, which has a prominent margin. In 
front of the anterior margin is a deep crescentic groove concentric with 
it. The inion is very prominent. The occipital region rises vertically from 
the foramen magnum, and its superior border is produced posteriorly. In 
transverse section, this region is very convex medially, and deepl}^ concave 
on each side above the bridge connecting the. paroccipital process with the 
condyle. A large foramen pierces the occipital bone in the fundus of this 
concavity. 
On viewing the cranium from below^ one is struck by the great inequal¬ 
ities of its surface. The occipital condyles inclose, with the paroccipital 
processes, a deep and wide fossa on each side. The bullse are very protu¬ 
berant, but do not project so far as the the pterygoid processes of the sphe¬ 
noid bone. The palate is extremely narrow at the diastema between the 
first and second premolars, and gradually widens forward until, between the 
external incisors, it is as wide as between the second premolars. The apices 
of the premaxillaries are separated by a deep notch. The posterior angle 
of the maxillary bone projects well beyond the notch, separating it from the 
processus triangidaris of the palatine bone, which carries the palatal roof 
back nearly as far as the posterior margin of the last molar. Anteriorly, 
