CUVIER’S CHGROPOTAMUS. 417 
comparison between the Chayropotamus and these species 
of the Hog tribe in this particular; but in the present 
specimen we see that the last molar of the lower Jaw (fig. 
164, 8, 7 3) presents the same additional posterior tubercles 
as in the Peceari, and confirms the view taken by Cuvier 
of the affinities of the ancient Pachyderms. 
This tooth offers, also, a miniature resemblance to the 
corresponding one in the Hippopotamus (see fig. 162, a 3). 
All the premolars were more simple in comparison with 
the true molars ; the last premolars of the upper jaw (fig. 
164, a, 3 and 4,) had each an external large and an inter- 
nal low and small tubercle, both enclosed by a basal ridge. 
The true molars are each like two premolars combined, and 
with the inner tubercles developed to equality with the 
outer ones; they have also the two small intermediate 
tubercles and a well-developed cingulum (ib. am 1 and im 
2): the last upper molar (m 8) resembles that of the 
Hyracothere. In the lower jaw the canine had much 
of the form and proportions of that of a Carnivore. There 
are three premolars in this Jaw; the one which answered 
to the first premolar above was not developed in the 
Cheropotamus : the first in place (ib. 8, p 2) had a com- 
pressed pointed crown and a small posterior talon, like that 
above; the second and third increase in breadth, but are 
narrower and more simple than those above. The true 
molars below are also narrower than the upper ones, but 
are quadricuspid with accessory tubercles, and a largely 
developed hinder talon in the last molar. 
Our fossil jaw fortunately yields a fact essential in 
characterizing the genus, and which the fragments in 
Cuvier’s possession were too imperfect to afford, viz., the 
exact number of molar teeth in the lower jaw, which is 
twelve. 
