Dr. J. E. Gray on the Dentition of Rhinoceroses. 357 



two large lateral ones. These teeth are close to the inner side 

 of the lateral ones in the skull of the foetal animal ; but they 

 become separated from them as the front of the jaw dilates for 

 the secretion of the permanent cutting-teeth, and when the 

 larger lateral cutting-teeth are developed they are more com- 

 pressed together. They are generally present ; but there is a 

 skuW oi Rki7ioceros javanicus in the Museum (723a) in which 

 they are deficient, the inner sides of the large lateral cutting- 

 teeth being very close together. 



In the lower jaw of the skulls of very young animals there 

 is a large conical cutting-tooth on each side in front. This 

 tooth is very depressed, and has sharp edges on the sides, and 

 a half-ovate end. It becomes worn down, and is replaced by 

 a larger tooth, which becomes worn down on the upper sur- 

 face so as to produce an elongated flat disk with an acute 

 front. 



In the skulls of the adult two-horned Asiatic Rhinoceroses 

 (Ceratorkinus) , these two middle cutting-teeth are wanting. 

 I have never seen a very young skull of these animals. 



Ceratorh inus sumatranus. 



The figure of the skull, like the figure of the animal, attached 

 to Mr. Bell's paper in the 'Philosophical Transactions' (vol. 

 Ixxxiii. 1793, p. 3, t. ii.-iv.) well represents this species, and 

 has well-developed cutting-teeth in the lower jaw, and the 

 space between the condyles of the skull narrow, which is the 

 character of this species. 



Home's figure of the skeleton of the Sumatran Rhinoceros 

 (Phil. Trans. 1821, t. xxii.), from the skeleton now in the 

 Royal College of Surgeons, better represents the height of the 

 skull, but scarcely sufficiently shows the distinction between 

 the two species. 



The figure of R. sumatrensis $ , Blainv. Osteog. t. ii., is 

 not so high behind as the skulls of either of the species, and 

 in other respects is not characteristic. 



Ceratorhinus niger. Plate XI. (skull). 



The British Museum purchased from the Zoological Society 

 the body of the Rhinoceros which Avas obtained by Mr. William 

 Jamrach at Singapore, and which was captured at ^lalacca in 

 1871. It is peculiar for having a very rough skin, the body 

 being covered with thick black hair ; the tail is comparatively 

 long and thin ; and the ears are closer together than in C. 

 sumatranus. 



Mr. Edward Gerrard, Jun., has preserved and stuffed the 

 skin, and prepared a very complete skeleton of tlie animal. 



