32 CARNIVORA. 



H. heberti, H. leptorliynclius) the lower border of the enamel bends 

 upwards at the posterior extremity of the tooth in precisely the 

 same manner, although not quite to the same extent, as in the 

 Siwalik teeth. In none of the European or American species, how- 

 ever, is there the marked cingulum of the latter ; while in all the 

 larger forms the hinder lobe is relatively larger ; although in the 

 much smaller H, crucians, Leidy 1 , the two lobes are more nearly of 

 the same length. In all, the anterior lobe is much stouter than the 

 posterior ; and the wear of the summits of the lobes is similar to 

 that of the Indian teeth." The length of the complete Indian tooth 

 is 0,026. 



M. 1685. The third right lower true molar ; from the Upper Eocene 



(Fig.) of Bach, near Lalbenque (Lot), France. This tooth, 



which is represented in the accompanying woodcut (fig. 2), 



Fig. 2. 



Hy&nodon (?) sp. The third right lower true molar ; from the Upper 

 Eocene of Bach. }. 



has lost the anterior fang, and agrees precisely, with the 

 exception of its inferior size, with the Indian teeth noticed 

 above. Its length is 0,020, and it evidently belonged 

 to the same genus, if not to a smaller race of the same 

 species, as the Indian specimens. It is different from the 

 corresponding tooth of all the European species of Hycm- 

 odon described by Filhol, and presents no resemblance to 

 Proviverra, Pterodon, or Oxycena ; while the writer has 

 been unable to identify it with any of the allied genera 

 from the American Tertiaries. To whatever genus it 

 really belongs, the occurrence in the Lower Tertiaries of 



1 Journ. Ac. Nat. Sci. Philadel. vol. vii. pi. ii. 



