neio (?e/jj/s o;* RliiiiocerotiJae. 7i;^ 



of tlio last jiremolar the ramus shows its greatest depth, and 

 then begins to slope upwards to a point some 4^ cm. beyond 

 the front border of the mental foramen (vviiich underlies the 

 front premolar) ; here the ramus turns downwards a little and 

 contains the stout root of the incisor. 



On the U[)per surface in front of the leading premolar the 

 border of the ramus forms a sharp edge whicii runs forwards 

 for about 4^ cm. ; it then swells out a little and turns 

 abruptly down to the incisors. 



The symphysis is 15^ cm. long and reaches to a level 

 exactly at the middle of the lust })remolar, where the width 

 between the rami, measured from the inside of these teetli, is 

 10 cm. 



The chief peculiarity of the jaw lies in the shape and 

 position of the single stout incisor in each ramus. These 

 teeth lie at the extreme front, closely apposed at their bases 

 and slightly divergent at their tips. The section for about 

 3^ cm. from the tip is roughly circular; on the outer side the 

 surface of the tooth runs back in a straight line, on the inner 

 side and at rather a low level a ridge arises whicli ends in a 

 Bwclliiig apposed to a similar process from the opposite tooth 

 (PI. X. lig. 2). Tlie two incisors are closely pressed together 

 at this point and the two edges run back in a straight median 

 line to the symphysis. 



It is extraordinary that the incisors show no sign of wear 

 in this specimen, seeing that the other teeth, with the excep- 

 tion of tiie one premolar, are practically worn down to the 

 socket. It is probable that tlie specimen was a female, and 

 the occurrence of rather larger incisors showing distinct signs 

 of wear on the inner side of the tip supports this view, whicli 

 is of some importance in considering the possible association 

 with this species of other bones found in the same locality*. 

 The great stoutness of the roots of these incisors is noticeable ; 

 a separate specimen (fig. la, p. 714) showing signs of wear 

 measures : — 



cm. 

 From tip of tooth to end of the enamel outside .... 6-9 



Greatest width of the enamel at base 6-5 



Greatest width of root 6-6 



Length of root lOU 



In addition to the specimen described above are two frao-- 



* Pilgrim (Rec. Geol. Surv. India, vol. xxxvii. part 2, pi. iv.) has 

 figured and described two such teeth as the upper incisors of Btic/ti- 

 therium. 



