60 HAND-LIST OF 



the Tenasserim rhinoceros, and do not know whether it is the same as 

 C. sumatranus from Sumatra or C. niger from Malacca, or whether it 

 may be a distinct species. Therefore I think it best, until we receive 

 skulls of the Tenasserim species, to give the Malaccan one a distinct 

 name and call it C. niger (as the black colour at once distinguishes it 

 from the greyish Sumatran species), more especially as some zoologists 

 who admit the difference of the two species refer B. Crossii, of which 

 we know nothing but the horn, to each of the species. 



Mr. Blyth, in the ' Journal of the Asiatic Society of Bengal,' vol. 

 xxxi. t. iii. f. 1, 2, 3, Hthographs from photographs (which he has since 

 given to me) three skulls of what he calls B. sumatranus from 

 Tenasserim. 



These skulls, according to the photographs, differ so much from each 

 other that they do not afford materials for the determination of the 

 question of the species to which the Tenasserim rhinoceros should be 

 referred. 



The photographs represent the skulls of animals of very different 

 ages ; but I cannot believe the difference between them depends solely 

 on age, as the skull of the oldest (fig. 1) and of the youngest (fig. 3) 

 agree in the shape of the occiput and in the upper surface not being 

 produced behind, while the skull of the half-grown one (fig. 2) has the 

 upper surface of the occiput very much produced backwards, and the 

 occipital condyles not so prominent. 



Mr. Blyth informs me that he beheves the adult skull (t. iii. f. 1) is 

 the skull of B. Crossii, which he thinks is B. lasiotis, and he beheves 

 that the two younger skulls (t. iii. f. 2 & 3) belong to the black rhino- 

 ceros. The youngest skull (t. iii. f. 3) has the skin of the head and horns 

 attached to it in the Museum at Calcutta. But the form of the lower 

 jaw in the two younger specimens do not agree with the lower jaw of 

 C. niger, and therefore I should provisionally name them C. Blythii, 



5!<*H< African Bhinocerotes. 



The African Bhinocerotes have the intermaxillary bones small, 

 laminar, situated on the front end of a bony plate, separated by a 

 suture (which becomes obhterated in the older specimens), in the inner 

 side of the front part of the maxillae, and have a tooth on its edge, 

 which generally falls out in the adult animal ; hence usually described 

 as having no intermaxillary cutting-teeth. The lower jaw of the young 

 B. bicornis (1365 6) has a small cylindrical cutting-tooth on each side 

 of the broad end of the jaw, which disappears in the older animals ; 

 and the breadth of the front of the jaw does not increase, and therefore 

 becomes smaller compared with the size of the skuU. In the skuU of 

 the foetal specimen of B. bicornis, 8^ in. long (1365 h), with the_ three 

 grinders but partially developed, the intermaxillaries are cartilaginous, 

 and show rudiments, or rather nuclei, of two teeth. 



The lamina on the inside of the maxillae of these African Bhinocerotes, 

 bearing the intermaxiQaries, is represented in the Asiatic Bliinocerotes 

 by a broad portion of the inside of the maxillae, which is marked by an 

 external groove; but in these animals the broad inteiTnaxilla is 

 attached to the end of the maxillae, as well as to the end of this defined 

 part. 



