372 



RHINOCEROS. 



both its shape, its partial bony septum, and the surfaces 

 for the attachment of the horns ; which surfaces are shown, 

 by Dr. Kaup's beautiful discovery, to be wanting in that 

 accordingly hornless extinct Rhinoceros, which, by way 

 of compensation, was provided with unusually large in- 

 cisive tusks. (Kaup, loc. cit., p. 109, pi. x.) By the ab- 

 sence of incisors, and by the form of the lower jaw, the 

 Rh, leptorhinus resembled the incisorless Rhinoceros bir 

 cornis of the Cape ; but, by the form and proportions 

 of the cranium, it much more nearly resembled the two- 

 horned Rhinoceros of Sumatra, and thus combined in its 

 own organization characters now distinct, and shared be- 

 tween two existing Rhinoceroses, the habitats of which, 

 in the present geographical distribution of Mammalia, are 

 divided by a thousand miles of ocean. 



Our chief information of the extent of the range of the 

 extinct species of Rhinoceros is derived from the discoveries 

 of their fossil teeth, which are the most common and the 

 most recognizable remains of these great Pachyderms. 



Cuvier expresses his regret that he had had no oppor- 

 tunity of examining the superior molar teeth of the Rhi- 

 noceros leptorhinus, so that he knew not whether they 

 presented characters analogous to those which distinguish 

 the molars of the existing species. He appeals to the 

 Italian naturalists to supply this hiatus ; and to this de- 

 sirable object the specimens which were obtained by Mr. 

 Brown in the same deposits at Clacton, with the cranium 

 and lower jaws of the leptorhine species, have greatly 

 contributed. 



The upper molars from Clacton consist of the last and 

 penultimate ones of the left side, and the ante-penultimate 

 molar of the right side. If this tooth (fig. 14]) be com- 

 pared with the upper molar of the Rhinoceros tichorhinus 



