THE AGE OF GREAT MAMMALS. 
75 
been found that must have 
had all the appearance of 
an elephant, except the 
head, which suggests a rhi¬ 
noceros ; instead of one 
horn they had four on the 
nose and the frontal bone. 
It is called dinoceras, which 
means terrible horn. An¬ 
other much like it is the 
dinothere (terrible beast). 
Equus: 
Quaternary 
and Recent. 
Pliohippus: 
Pliocene. 
which had a short trunk Prytohippus; 
Lower 
and tusks that curved pliocene, 
downward. The paleo- 
there (ancient beast) had 
the characteristics of a 
horse and a tapir. Another Miohippus; 
beast was a mixture of a 
cow and bear, with teeth 
like a beaver. 
In these beds is found 
a very curious fossil. It is jfesobippus; 
an animal that resembles Lower 
our horse; indeed, it was 
the ancestor of the horse, 
but it had four toes on its 
front foot and three on 
the hind foot. It is named ’ 
Fig. 44.—Development of fore foot (a) and 
hind foot (&) of the horse during Ter¬ 
tiary times. 
