. . RHINOCEKOS. 83 



eluded' by the two ridges forming the parietal crest, it gradually expands forward, 

 and, between the supra-orbitar processes, measures in its perfect state seven inches 

 in breadth. On each side of the forehead above the anterior part of the orbits, and 

 extending a short distance upon the nose, it is prominent and convex ; but in the 

 middle of the forehead, and upon the nasal bones, which incline slightly at their 

 upper surface towards each other, it is transversely concave. Upon the forehead, 

 in the specimen, are three slight exostoses. 



The fronto-nasal suture is doubly crescentic with the conjoined horns directed 

 forward. The lateral margins of the ossa nasi converge anteriorly, and are a little 

 concave, but vertically are convex, and the naso-maxillary suture has been about 

 three inches and a half in length. 



Posterior View. — In examining the head from behind, the remarkable degree of 

 lateral compression of the cranium in comparison with that of the Bhinoceros in- 

 dicus is a striking feature of the species. The inion is exceedingly narrow in 

 comparison with that of other species of Rhinoceros, and the occiput, in a corre- 

 sponding degree, bulges out posteriorly, so that, in the median line, it projects at 

 least an inch back of the position of the condyles. 



In a corresponding degree with the narrowness of the cranium this is elongated, 

 so that neither its capacity nor its surfaces for muscular attachment are less than 

 in existing species of Rhinoceros. 



In the specimen, the occipital foramen and condyles are too much broken to 

 judge accurately of their form. The former appears to have been vertically oval, 

 and not so much notched above as in RJiinoceros indicus; and it measured about one 

 inch and a half in its long diameter, and one and a fifth in breadth. The condyles 

 appear not to have differed in form from those of recent species of the same genus. 



Inferior Vieio. — (PL XII. 1.) The base of the skull is more nearly horizontal than 

 in recent species of Rhinoceros. 



A portion of one condyle, preserved in the specimen, indicates the position of the 

 condyles to be more vertical than in Rhinoceros indicus. The angle of their arti- 

 cular surface is also more abrupt, is lateral, and nearly vertical. The posterior 

 pgrtion of the articular surface is directed backward and relatively slightly upward ; 

 the inferior portion forward and outward, or much less downward than in Rhino- 

 ceros indicus. 



The basilar process in advance of the condyles is narrow, measuring a little over 

 an inch only between the anterior condyloid foramina. It is elevated in the median 

 .line into a prominent acute crest, which is pyramidal posteriorly, and serves as a 

 sort of abutment to the inferior termination of the condyles, and anteriorly it 

 gradually decreases and vanishes at the prominent junction of the process with 

 the post-sphenoidal body. The sides of the basilar process are concave antero-pos- 

 teriorly, and form, between the condyle and the para-mastoid process, a deep con- 

 cavity, at the anterior part of the bottom of which the condyloid foramen is situated. 



The para-mastoid processes are broken in the specimen, and they appear to have 

 been relatively small in comparison with those of Rhinoceros indicus; projecting, as 

 they do, very little below the mastoid processes, which are much more robust in 

 their proportions. 



