150 TJNGULATA. 



from the Miocene of Nebraska, and is preserved in the 

 Museum of Natural Sciences at Philadelphia ; it is figured 

 in the Smith. Contrib. Know. vol. vi. pi. 1 (1854). 



Purchased, 1868. 



Family TKAGULID^. 



The fossil forms apparently indicate a transition from the typical 

 genus to the Cervidce (through Prodremotherium) on the one hand, 

 and on the other to the Dichodontidce, so that no exact definition of 

 the family can be given. In the typical form, the cheek-teeth in 

 front of pm- 4 are simply secant, and thereby differ from those of 

 the Cervidce ; Prodremotherium, however, is somewhat intermediate 

 in this respect. All the genera are unprovided with antlers. In 

 the recent forms the navicular and cuboid are united ; but the 

 median metapodials either unite very late, or remain separate 

 throughout life (Hyomoschus). The teeth are selenodont in struc- 

 ture, the upper true molars having four columns. 



Genus PRODREMOTHERIUM, Filhol 1 . 

 Eiitimeyer places this genus in the present family ; the penulti- 

 mate upper premolar is not, however, of the simply secant form 

 which is characteristic of the existing Tragulidas, but has an inner 

 expansion, foreshadowing the inner crescent of the Cervidce. The 

 bones referred to this genus by Filhol show that the metapodials are 

 fused into a cannon-bone. The dental formula is I. |, C. j, Pm. | 



m. !• 



Prodremotherium elongatum, Filhol 2 . 

 Hob. France. 



M. 1415. Fragment of the left maxilla, containing the last five 

 cheek-teeth ; from the Upper Eocene of Caylux (Tarn-et- 

 Garonne), France. This specimen agrees precisely with 

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

 pi. xi. fig. 268. The length of the space occupied by the 

 three true molars is 0,027, and the length of m. 3 0,010 

 and its width 0,011. Purchased, 1884. 



M. 1425. Fragment of the left maxilla, containing the last five 



1 Ann. Sci. Geol. vol. viii. art. 1, p. 228 (1877). 



2 Loc. cit. 



