S2 EHINOCEROS. 



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 l^y tlic 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 indicits, 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- 

 wai'd 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, Avhich 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. Prom 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 oi Rhinoceros indicus; and this bone is stronger, and is articulated 

 by a finer serrated suture. It rises much more than in Rhinoceros 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 tlie 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 Vieio.' — (PI. XIII. 1.) The upper view of the head pi'esents an extensive, 

 depressed, trapezoidal surface. Commencing posteriorly as an angular groove, in- 



