RHINOCEROS. 



dentine at its shallower commencement, and a second island 

 of enamel is produced, as in the molar tooth figured by 

 Cuvier, ' Ossemens Fossils, 1 4to., 1822, torn. ii. pt. 1. pi. 

 xiii. fig. 6. In very old Rhinoceroses the first formed island 



ig. 126. 



Fourth right upper molar ; nat. size ; Rhinoceros ticJwrhinus ; Cave, Kent's Hole, 



Torquay. 



of enamel, which surrounds the shallowest depression, is 

 worn away, and the grinding surface simplified to the 

 pattern figured by Cuvier in the plate above cited, 

 fig. 5. 



The teeth of the lower jaw of the Rhinoceros present the 

 same degree of resemblance to these of the Palaeotherium, 

 as exists in the upper jaw. The crown of each molar 

 consists of two vertical crescentic lobes, but these are less 

 regularly curved, are placed more obliquely with regard to 

 each other, and are divided by a deeper cleft. Hence the 

 dentinal substance of the two lobes, when exposed at their 



