88" RHINOCEROS. 



Tlie post-orbital process, though merely the termination of the supra-orbital 

 margin, is nevertheless well marked compared with its condition in Rhinoceros 

 indicus. 



As in the latter, there exists a prominent lachrymal process ; but there are two 

 lachrymal foramina, placed one above the other internal to the process. 



The malar bone is robust, and in its course is directed a trifling degree more 

 outward than in Rhinoceros occidentalis, and its external face presents more upward. 



The alveolar portion of the face is vertical, but antero-posteriorly is convex. 

 The position of the lachrymal bone presents an oblique slightly depressed surface. 



The infra-orbital foramen is placed about an inch above the interval of the 

 second and third molar teeth. 



In all the specimens, the remainder of the face is too much broken to form any 

 correct idea of its form. 



Superior View. — (PI. XIV. 11.) The forehead, preserved nearly entire in one 

 specimen, is broad, and above the oi'bits is elevated and convex, but is depressed 

 towards the median line. The temporal ridges converging from the post-orbitar 

 processes are relatively not so j^rominent as in Rhinoceros occidentalis ; but, as in 

 this, they evidently conjoin to form a sagittal crest. 



Posterior View. — (PI. XIV. 12.) The inion has a more trilateral outline than 

 in Rhinoceros indicus, and in the middle it is much more bulging or prominent, so 

 that the superior angular margin of the foramen magnum projects considerably 

 posterior to the basilar margin. Towards the summit the median portion of the 

 surface of the inion becomes depressed, and each side is directed quite laterally in 

 its course to the temporal margin. 



The occipital condyles are more vertical in their relation to one another than in 

 Rhinoceros indicus; and above each there is a well-marked depression of the surface. 



The occipital foramen is subrotund, and about ten lines in diameter, and it has 

 an angular margin above and a concave one below. It is directed backward and a 

 little downward. 



Inferior View. — (PI. XV. 2.) In the specimen in which the base of the skull is 

 preserved, the junction of the basilar process and sphenoidal body is completely 

 obliterated. Near its position on each side is a superficial rough elevation for 

 muscular attachment. 



The median line of the basilar process is prominent, and each side is slightly 

 depressed. 



The sphenoidal bodies are prominently convex, and within the roots of the 

 pterygoid processes slope on each side to form a broad shallow groove for the 

 Eustachian tube. 



Separated by the anterior scrolhlike terminations of the occipital condyles, a 

 distance of ten lines, are the anterior condyloid foramina, which are oval and three 

 lines in diameter antero-posteriorly. 



To the outside of the latter, and a little in advance, is the para-mastoid process, 

 existing in the specimen as a broad stump, compressed antero-posteriorly. 



The mastoid process forms the posterior abutment of a high arch conducting to 

 the entrance of the tympanic cavity, or in other words the meatus auditorius, as it 



