336 RHINOCEROS. 
dentine at its shallower commencement, and a second island 
of enamel is produced, as in the molar tooth figured by 
Cuvier, ‘Ossemens Fossils, 4to., 1822, tom. ii. pt. 1. pl. 
xii. fig. 6. In very old Rhinoceroses the first formed island 
Fourth right upper molar ; nat. size ; Rhinoceros tichorhinus ; 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 Paleotherium, 
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 
