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89 RHINOCEROS. 
but it is longer, and less deep vertically. Superiorly, it is bounded by an acute 
ridge, diverging from the median line to the post-orbitar process. The parietal 
crest formed by the contiguity of this ridge of each side is broad and strong, and 
includes a median angular groove. 
From the temporal surface, inclining to the middle line of the cranium, it appears 
more oblique than that of Rhinoceros indicus, but for two inches and a half above 
the zygomatic root it is nearly vertically convex. In advance of the root of the 
zygomatic process, the temporal fossa appears more deeply excavated than in the 
last mentioned species; and anteriorly it is better defined from the orbital cavity 
by a prominent pyramidal ridge, which proceeds in a curved line inward and back- 
ward from the post-orbital process to the position of the spheno-orbital foramen. 
The side of the face from the post-orbital process forward is vertical. The orbit 
is excavated more transversely and deeply than in Rhinoceros indicus, and its ori- 
fice is better defined. The entrance constitutes three-fourths of a circle, and is 
bounded above by a very prominent supra-orbitar process, which is formed by the 
confluence of the antero- and post-orbitar processes. The surface of the supra-~ 
orbitar process is convex and rough, and its lower margin slightly overhangs the 
inferior edge of the orbit. The vertical diameter of the entrance of the orbit is 
two inches and a quarter; and it is defined below by a small pyramidal process at 
the junction of the malar bone with the zygomatic process of the temporal. The 
floor of the orbit is deeply concave, and terminates posteriorly by an abrupt convex 
margin. The lachrymal bone and foramen are too much broken to judge accu- 
rately of their form, but there appears to have been a single one of the latter, rela- 
tively of large size. The lachrymal process was small: and rough. The face in 
advance of the orbit is much fractured in the specimen. It is relatively longer 
than in Rhinoceros indicus, and is quite vertical the entire extent. The greater 
portion of the infra-orbitar foramen is broken away, but sufficient remains to show 
its position to be about one inch and a half above the interval of the second and 
third molar. From a fragment of the left intermaxillary bone being preserved, it 
may be determined that the notch of the anterior nares was relatively short, com- 
pared with that of Rhinoceros indicus ; and this bone is stronger, and is articulated 
by a finer serrated suture. It rises much more than in Fhinoceros indicus, its pos- 
tero-superior extremity being even above the middle line of the face, or it is on a line 
with the inferior suture of the lachrymal bone, which is above the inferior margin 
of the orbit. The maxillo-intermaxillary suture is only a half an inch below the 
anterior portion of the naso-maxillary suture. 
The intermaxillary fragment retains the bottom of the corresponding incisive 
alveolus, and this is just twenty-two lines from the posterior extremity of the bone 
in which it is situated, or is one inch and a quarter from the upper portion of the 
maxillo-intermaxillary suture, and presents some idea of the relative position of the 
incisive teeth compared with those of Rhinoceros indicus. So far as can be ascer- 
tained, the hiatus in advance of the molars to the intermaxillary bone has been 
about one inch and a half. 
Superior View.—(Pl. XIII. 1.) The upper view of the head presents an extensive, 
depressed, trapezoidal surface. Commencing posteriorly as an angular groove, in- 
