156 UNGTJLATA. 



M. 2158. Part of the right ramus of the mandible, containing the 

 last four cheek-teeth ; from the Upper Eocene of Caylux. 

 The length of the space occupied by the three true molars 

 is 0,025, and the length of m73 0,012. Purchased, 1885. 



M. 2150. Fragment of the left ramus of the mandible, containing 

 all the cheek-teeth except m73 ; from the Upper Eocene of 

 Caylux. The length of the space occupied by the three 

 premolars is 0,0195 ; it is highly probable that this spe- 

 cimen belongs to the same individual as the maxilla 

 No. M. 2153. Purchased, 1885. 



M. 1429. Part of the right ramus of the mandible, containing pm. 4, 

 mTT, mT5, and the first lobe of roTS ; from the Upper 

 Eocene of Caylux. This jaw agrees precisely with the 

 one figured by Filhol in the Ann. Sci. Geol. vol. viii. 

 pi. iii. fig. 257. Purchased, 1884. 



M. 1429 a. Two fragments of the hinder portion of the mandible ; 

 from the Upper Eocene of Caylux. Purchased, 1884. 



M. 1427. The nearly complete left ramus of the mandible of a young 



{Fig.) individual, containing all the cheek-teeth except mm. 2, of 



which the alveolus remains ; from the Upper Eocene of 



Caylux. This specimen, which is represented in the 



woodcut (fig. 16), agrees with the type mandibles in the 



Fig. 16. 



Bachitherium curtum. The left ramus of the mandible of a young individual 

 from the Upper Eocene of Caylux. \. 



form and size of the true molars, in the long diastema, 

 the slenderness of the ramus, and its straight inferior 

 border, and the presence of two mental foramina, one of 

 which is situated immediately behind the alveolus of the 

 canine, and the other x below mm. 2. The length of the 



1 Not shown in the woodcut. 



