OF THE SIVALIK HILLS. 



53 



Our collection however exhibits one solitary instance of the anterior extre- 

 mity of a reniform tusk truncated on the inner or concave surface ; this 

 unfortunately is a separate fragment, and unattached to any portion of the 

 jaw, and bearing in itself no further mark of its having existed in the lower 

 jaw than this truncation of the extremity. It is difficult to imagine any 

 fortuitous circumstance that would have produced such an anomaly, and it 

 is at the same time difficult to come to a conclusion contrary to the facts 

 elicited by such an extensive collection of remains, in which we see no sign 

 of the reniform character of the canine in the upper jaw ; should the trunca- 

 tion alluded to not be accidental, or caused by some deformity in the position 

 in the alveolus, we have yet to discover a variety of the Hippopotamus with 

 the reniform tusk in the lower jaw. The fact of the existence of this fragment 

 however may be as well noted ; as we observe peculiarities of form in other 

 fragments of the bones of the head that may ultimately prove to belong- 

 to different species. We have contented ourselves with drawing our com- 

 parisons from the bones of 1t!i*e head, without any reference to the osseous 

 structure generally of the animal, in which our collections however abound, 

 especially in vertebrae, and the solid articulating extremities of the bones. A 

 more lengthened period of search and examination, will add much to the 

 value of an enquiry upon this point, and a comparison with the actual bones 

 of the Cape Hippopotamus instead of with Cuvier's drawings, will render 

 any attempt at a discrimination of existing differences, easier, and when 

 completed and worked out, doubly valuable. 



Northern Dodh, November 15, 1835. 



Note. — At the time of ordering this article to press, (25th January 1836,) the drawings 

 of the varieties of Fossil Hippopotamus in the Museum of Messrs. Falconer and Cautley 

 have not reached the Society. The omission is however in a great measure supplied by the 

 drawings of the specimens in the Dddupur Museum of Lieutenants Baker and Durand, 

 presented to the Society by the latter Officer, which are published, together with his descriptive 

 Note, in the following article. Sec. 



O 



