Fres., 1912. MAMMALS OF ILLINOIS AND Wisconsin — Cory. 17 
Hind foot of Rabbit. Hind foot of Opossum. 
Bear. Panther. Horse. 
Plantigrade type of foot. Digitigrade type of foot. 
(Practically whole sole of foot (Only toes touching the ground.) 
touching the ground.) 
hoofs, which have been developed by modification and thickening 
of the cuticle. The number of digits normally vary from 1 to 5 in 
different animals. In the Deer the first is absent, the 3d and 4th 
support functional hoofs, and the 2d and 5th appear as small, eleva- 
ted lateral hoofs or ‘‘false hoofs.”’ In the Horse the foot structure 
consists of a single digit (the 3d), the others having been lost.* 
ANATOMICAL AND PHYSIOLOGICAL CHARACTERS IN 
GENERAL. 
Having gained some slight knowledge of the bony framework, it is 
essential that the student should know something more about their 
*Palzontologists have been able to trace the evolution of the foot of the Horse 
from its four-toed Eocene ancestor, showing the gradual lessening in the number of 
digits. Prof. Cope believed the five-toed Coryphodon to represent a group, from 
which all Ungulates have sprung. 
