RHINOCEROS LEPTORHINUS. 



361 



Fig. 133. 



appears to be the same scale as that on which Dr. Kaup's 

 specimen of the lower jaw of the Rhinoceros Merckii is 

 figured in the ' Akten der Urwelt,' tab. ii. 



The socket of the second molar, (p 2,) or the sixth, count- 

 ing from behind forwards, is entirely in advance of the 

 transverse line drawn across 

 the back part of the symphysis, 

 and the molar series is conse- 

 quently extended much closer 

 to the end of the jaw than 

 in the Rhinoceros tichorhinus. 

 This part of the symphysis also 

 is rounded inwards towards its 

 anterior termination in the pre- 

 sent specimen, producing a very 

 different contour from that pro- 

 duced by the swelling out of 

 the same part to form the flat- 

 tened spatulate extremity, cha- 

 racteristic of the lower jaw of 

 the Rh. tichorhinus (fig. 124). 

 The lower border of the jaw is 

 less curved in the Rh. leptorhi- 

 nus, and the depth less sudden- 

 ly diminished at the symphysis. 

 The fore-part of the base of the 

 coronoid process is more promi- 

 nent externally in the Rh. lep- 

 torhinus than in the Rh. ticho- 

 rhinus. The molar teeth are 

 larger, and the series occupies 

 a greater extent in the jaw 

 of the leptorhine species. 



Lower jaw, Rhinoceros leptorhinus- 

 h nat. size. Clacton, Essex. 



