RHINOCEROS LEPTORHINUS. 



363 



Rh. leptorhinus. 

 In. Lin. 



Rh. tichorhimts. 

 In. Lin. 



Antero-posterior extent of second, third, and fourth \ . 



premolar 



second premolar 

 fourth premolar . 



3 



7 



Fig. 135. 



There is a still more marked 

 distinction of form, which, as it 

 is rarely manifested in the lower 

 molars of the Rhinoceros genus, 

 I have here illustrated by two 

 cuts of the natural size; fig. 136, 

 showing the inner side of the 

 second premolar of the Rhinoceros 

 leptorhinus, and fig. 137, p 2, that 

 of the Rh. tichorhinus, the latter 



Rhinoceros leptorhinus^ rather 



being from Lawford, near Rugby, less than nat. size. Clacton. 



Fig. 136. 



T 2 



Fig. 137. 



2nd premolar, nat. size. Rhinoceros 

 leptorhinus. Clacton. 



1st and 2nd premolars, nat. size. 

 Rhinoceros tichorhinus. Lawford. 



In Dr. Buckland's collection at Oxford there is a speci- 

 men of a considerable part of the right ramus and sym- 

 physis of the lower jaw of a young, but nearly full grown, 

 Rhinoceros leptorhinus. The last molar tooth has half 

 risen above its alveolus, and the summit of the anterior 

 crescent had just begun to be used in mastication : the 



