CONEYS. 
89 
the Rodents, triangular in section, with one of the angles directed 
forwards, so that, by a somewhat similar mode of wearing as 
that described in Rodents, a sharp point is formed and preserved at 
this angle. The lower incisors are short, flattened, and rooted. 
The dental formula is: — I. J, C. §, Pm. |, M. |x 2 = 34. 
No extinct forms at all closely related to the Hyracoidea have 
been discovered. 
Suborder Perissodactyla. 
The Perissodactyla, or Odd-toed Ungulates, composed at the 
present time, as already noted, of the Rhinoceros, Tapirs, and 
Horses, are characterized by the central line of the foot passing 
Fig. 49. Fig. 50. 
m 
Bones of fore foot of Horse and Ebinoceros. 
c, carpus ; me, metacarpus. 
down the middle of the third toe, which is always the largest, the 
other toes being ranged in a receding series on each side of it 
(see fig. 50). Generally only one or three toes are present ; but the 
Tapirs possess a fourth outer toe on their fore feet, the third toe, 
however, still forming by itself the central and main axis of the 
foot. The Perissodactyla are further marked by having their 
