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. 



IV 



HL 



Bones of fore foot of Horse and Rhinoceros, 

 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 



