RHINOCEROS. 89 
exists in Rhinoceros indicus, is open at the bottom. The process is strong and is 
bent forward at its apex, which is tuberous and extends nearly as far downward as 
the post-glenoid tubercle, from which it is about five lines distant. 
The pars petrosa is quite small. It appears at the bottom of the arch between 
the post-glenoid and para-mastoid processes, as a V-shaped body, bent forward at 
its lower part by the base of the styloid process. 
The remaining portion of the latter, in the specimen, is a stout cylinder clasped 
antero-internally by the os petrosa. 
Between the bottom of the styloid and para-mastoid processes is the stylo- 
mastoid foramen. 
The foramen lacerum is a very large reniform vacuity, being about an inch in 
diameter antero-posteriorly, and about four lines transversely. 
In advance of the latter a few lines is a distinct foramen ovale, and a short 
distance antero-internal to this is a round foramen, conducting into the homologue 
of the foramina rotundum and spheno-orbitale. 
The latter opens at the bottom of the orbit just internal to a pointed process 
arising from the conjunction of three ridges; one of which comes from the margin 
of the foramen, the other from above the position of the optic foramen, and the 
third constitutes the boundary of origin between the temporal and external ptery- 
goid surfaces. 
The optic foramen is placed about an inch in advance of the spheno-orbitale. 
The glenoid articulation is more concave than in hinoceros indicus, and that 
portion of its surface situated on the anterior part of the root of the zygomatic 
process presents more backward and outward. 
The post-glenoid tubercle, compared with that of Rhinoceros indicus, is relatively 
short; at its outer margin being ten lines in length, and it projects only two lines 
below the mastoid process. What it loses in length it gains in robustness and 
breadth; and its outer side is rough, and the apex truncated. Posteriorly it is 
perforated by a vertical foramen. 
The interpalatine notch extends forward as far as the posterior third of the 
penultimate molar tooth. 
The hard palate is strongly arched, though not so much as in Rhinoceros occi- 
dentalis, and it also differs from that of the latter in being relatively broader, and 
less convergent at the alveolar margin anteriorly. 
Inferior Maxilla.—(P1l. XIV. 2.) The body of the lower jaw externally is ver- 
tically convex, and anteriorly is more convergent than in Fhinoceros indicus. Its 
depth below the posterior molar tooth is about twenty lines; below the first molar, 
fifteen lines. The base is rounded, and is about as convex antero-posteriorly as in 
the last mentioned species. 
In the specimen under investigation, the symphysis is broken off a few lines in 
advance of the molars, and it there presents a crescentic surface only ten lines 
broad and six deep, indicating the inferior incisor teeth to be of small size in this 
species. Upon each side of the broken surface, about three-fourths of an inch from 
the position of the first molar teeth, there remains the end of the fang of the 
external incisors. 
