CMNOTUEBIIDM. 175 



M. 1410 C. Fragment of the right maxilla, containing the last five 

 cheek-teeth, not improbably belonging to the present 

 species ; from the Upper Eocene of Caylux. The length 

 of the space occupied by the five teeth is 0,019. 



Purchased, 1884. 



Csenotherium cadur cense (P. Gervais'). 

 Syn. Plesiomeryx cadurcensis, P. Gervais 2 . 



This species is smaller than G. commune; and has a distinct 

 diastema in both jaws, occurring between the first and second 

 premolars. 



Hob. Prance. 



M. 1988 d. The nearly complete cranium, showing all the dentition ; 

 from the Upper Eocene of Caylux (Tarn-et-Garonne), 

 Prance. The length of the space occupied by the last 

 six cheek-teeth in this specimen measures 0,0175, which 

 agrees very closely with the dimensions of the specimen 

 figured by Pilhol in the Ann. Sci. Geol. vol. viii. pi. xii. 

 fig. 271. Purchased, 1884. 



M. 1404 a, M. 1789, M. 1791. Four rami of the mandible; from 

 the Upper Eocene of Caylux. The length of the space 

 occupied by the last six teeth is 0,020 ; which is somewhat 

 less than in a specimen described by Pilhol in the Ann. 

 Sci. Geol. vol. viii. art. 1, p. 207 (0,0215). This may 

 indicate that C. gracile, Pomel, from St. Gerand-le-Puy, 

 which is only distinguished from O. cadurcense by its 

 inferior size, may really be only a small race of this 

 species. Purchased, 1884. 



M. 1402 "b. The left ramus of the mandible ; from the Upper Eocene 

 of Caylux. Purchased, 1884. 



Caenotherium quin que dent atum (Pilhol 3 ). 

 Syn. Plesiomeryx quinquedentata, Filhol 4 . 



This is a very small species, known only by the mandible. There 

 is a diastema between pm. 2 and p m . 3. 

 Hob. Prance. 



1 Journ. Zool. vol. ii. p. 369 (1873), Plesiomeryx. 2 Loc. cit. 



3 Ann. Sci. Geol. vol. viii. art. 1, p. 210 (1877), Plesiomeryx. 



4 Loc. cit. 



