CIIALICOTIIERIUM SIVALENSE. 217 



one corresponding in size and position with the posterior 

 ' fossette ' and the other separating the conical tubercle from 

 the rudiment of the anterior inner lobe. 



The upper back molars, more especially the two last, are 

 enormously large, in comparison with the other teeth or with 

 the dimensions of the head. If found isolated they would 

 seem suitable to an animal approaching the size of a Rhino- 

 ceros, whereas the anterior part of the lower jaw and the 

 muzzle do not reach the dimensions of the Indian Tapir. 



Upper Premolars. — The upper premolars in Ghalicotheriwm 

 are limited to the three last : the normal first being sup- 

 pressed. They differ more from the corresponding teeth of 

 Anoplotherium commune than do the true molars. In the 

 latter the premolars are compressed lengthwise, and their 

 outer surface retains the three-ridged division which is pre- 

 sented by the true raolars, while the conical tubercle, at the 

 inner side, is lost in a salient edge, which goes all round the 

 circuit of their oblong crown.' In Chalicotherium Sivalense, 

 on the contrary, the premolars are compressed in the trans- 

 verse direction, so as to make them somewhat cuneiform from 

 the outside inwards ; their outer surface loses the vertical 

 bulges of the back molars and becomes nearly flat, as in Rhi- 

 noceros ; while they retain the conical tubercle at the in- 

 side, as a well-marked distinct lobe throughout. Taken in 

 succession, from rear to front, they diminish very rapidly in 

 size, the vinited length of the three teeth not exceeding 

 much the width of the penultimate trtie molar; while in 

 Anoplotherium comm^une the proportion in length of the three 

 true molars to the three last premolars is nearly as 3 to 2. 

 The internal conical tubercle, as in the case of the back 

 molars, gives off in front and behind a low basal ridge, 

 bounding the teeth on their inner side. The form of the 

 outer surface of these teeth is well shown on the right side 

 of the Dadoopoor specimen. The antepenidtimate or first 

 (theoretically the second) has a cuneiform outline to the 

 outer edge of the crown, and is implanted by a double con- 

 nate fang. The second (p.m. 2) is of the same form but 

 broader. The last (p.m. 3) is still broader, and presents an 

 obscure indication vertically of a division into an anterior 

 and posterior lobe. The first true molar (m. 1) which follows, 

 is distinguished at once from the premolars by the saliency 

 of its projecting bulges. The form presented by the worn 

 grinding surface of the premolars is well exhibited by fig. 1 



' 'Leur earactere est d'avoir dans le tranehant.' — Cuvier, Oss. Foss., torn, iii, 

 genre una couronne oblongue, entoiiT(5e p. 19 (4to. edit.), 

 de touts parte d'lm rebord saillant et 



