THICK-SKINNED BEASTS. 45 



Tlie Asiatic Eliinocerotes have the fi'ont of the nasal bone convex, 

 produced, and more or less acnte in front. The intermaxillaries 

 in the skull of the very young animal are spongy and united 

 together in front, with two rudimentary teeth on the 

 hinder part of each side. In the older animals these 

 teeth are more elongate, produced, and separate from each 

 other in fr'ont, and supported by a more or less long process 

 of the intermaxillary bone, which encases the upper and outer 

 side of thefr hinder part. They have two teeth on each side, 

 the hinder being the smallest ; but in the older animals both 

 these teeth drop out, and the fr'ont one is replaced by a large 

 tooth, which eventually has a large flattened crown. 



'•' One-horned Bhinocerotes. 



Nose with one horn. Lower jaw with a pah of small cyhndiical 

 central cutting-teeth between the large lateral ones. The central 

 cutting-teeth rarely absent in the adult skulls. 



1. RHINOCEKOS, Gray, Cat. Carniv. &c. p. 300. 



In the Asiatic one-horned Eliinocerotes {Rhinoceros) there is a small 

 cylindrical cutting-tooth on the inner side of the two 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 compressed together. They are generally present ; 

 but there is a skull of Rhinoceros javanicus in the Museum (723 a) 

 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 side, and a half-ovate end. 

 It becomes worn down and is replaced by a larger tooth, which becomes 

 worn down on the upper surface so as to produce an elongated flat 

 disk with an acute front. In the skulls of adult two-horned Asiatic 

 Bhinocerotes {Ceratorhinus) these two middle cutting-teeth are 

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



1. Ehinoceros javanicus. Gray, Cat. Carniv. dc. p. 300. 



E. sondaicus, Horsfield, Java, t. (animal). 



S. Midler, Verhandl. t. xxxiii. (animal, male and feraale). 



F. javanus, Blainv. Ost. t. i. ii. & vii. 



E. sondaicus, Cuv. Oss. Foss. t. xvii. xvui (skeleton). Blyth,Journ. 

 Asiatic Soc. Bengal, xxxi. t. 1 & 2 (skull). 



723 d. Skeleton with skull ; adult. 

 Java. Mus. Leyden. 



723 e. Skeleton with skuU ; half-grown. 

 " E. sumatranus," Mus. Leyden. 

 Sumatra. Mus. Leyden. Franks, 



