RHINOCEROS LEPTORUINUS. 363 
Rh, leptorhinus. Rh, tichorhinus, 
In. Lin. In. Lin. 
Antero-posterior extent of second, third, and fourth £18 fe 8 
premolar ° . : < a5 
9 55 second premolar Z 1 3} ] 0 
” » fourth premolar . ee a 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, vather 
being from Lawford, near Rugby. less than 4 nat. size. Clacton. 
Fig. 136. Fig. 137. 
aa, 
My) 
2nd premolar, nat. size. Rhinoceros Ist and 2nd premolars, nat. size. 
leptorhinus. Clacton. 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 
