1838.] On the genus Hexaprotodon. 1045 



pose to name it Hex. anisiperus, from atiisos unequal and peras a line, 

 refering to the irregular form of the incisors in this, compared with 

 the other hexaprotodons. 



I am also led to the conclusion as already stated, that Dr. Mac- 

 Loed's specimen fig. 6 affords a third species agreeing with H. Siva- 

 lensis in having a broad muzzle and the incisors in a straight line, but 

 differing from that species in the molar teeth being nearly parallel on 

 either side of the jaw, or less contracted behind the canine teeth, and the 

 general form of the jaw thicker and broader than any other member of 

 the group, and hence it may be named Ilexap. megagnathus, from 

 megas large and gnathos the jaw. 



In addition to these the small specimen fig. 7 must, I think, be 

 regarded as afourth species, distinguished by its broad shallow muz- 

 zle, and though much contracted behind the incisors like H. Sivalensis, 

 still differing from that species in the flattened form of the jaw, on 

 which account it may be named Hexap. platyvhynchus, from platus 

 flat, and rhynchus the snout. 



In the only upper jaw of hexaprotodon in Colonel Colvin's 

 collection in the Asiatic Society's museum ; the cheek teeth on 

 the left side are all nearly perfect, and so much worn as to indicate 

 the advanced age of the individual to which it belonged. The 

 incisors are removed but their sockets are as distinctly marked on 

 both sides as could be wished. From the form of the muzzle it would 

 appear that the upper incisors were directed more abruptly downwards 

 than in the hippopotamus, they must consequently have been very 

 short as their growth would necessarily be interrupted by the lower 

 incisors ; they are also of rather smaller diameter than the latter, but 

 of equal size among themselves, and appear to have been intended for 

 grasping such substances as were collected on the lower range of teeth, 

 and with the assistance of the lips and tongue for drawing a soft 

 aliment into the mouth, rather than for tearing like the hippopo- 

 tamus. This jaw appears to have belonged to the same species 

 as fig. 5, but to an individual a little larger. 



It is unnecessary to say that the intermixture of terrestrial and 

 aquatic forms entombed in the Siwalik hills, renders it impossible to 

 derive any conclusion as to the habits of an animal towards land or water 

 from its remains having been found in such a situation. The small col- 

 lection of Dr. MacLoed comprises, in addition to the fragments of the 

 jaws Of a Hexaprotodon, the upper jaw of a P 'alee other turn, the frontal 

 bone and horns of a Bos, various fragments of elephants and the 

 scales or armour of a gigantic Garial nearly allied to Lacerta gange- 

 6 q 2 



