
oo CARNIVORA. 
H. heberti, H. leptorhynchus) 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*, 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), 

Hyenodon (?) sp.—The third right lower true molar; from the Upper 
.Eocene of Bach. 2. 
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 Hyan- 
odon described by Filhol, and presents no resemblance to 
Proviverra, Pterodon, or Oxyena; 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. pl. ii. 
