THE 



EQUIDJ3 IN GENERAL. 



IN the structure of the whole family, we find, 

 among fossil remains, only slight differences in size 

 and relative proportions ; and the teeth, from those 

 of a large horse (which are exceedingly rare) vary, 

 to some, with the crown obviously narrower than 

 in the domestic races. Turning to the existing spe- 

 cies, all have similar viscera, the same form of 

 stomach, not adapted for rumination; they have, 

 with perhaps one exception, the same number and 

 structure of teeth; that is, six incisors both above 

 and below, one cuspidate on each side in both jaws, 

 six molars above and the same number below on 

 each side, making forty teeth in all. In the fe- 

 males the cuspidates are not commonly observed. 

 One species (the hemionus) is reported to have only 

 thirty-four teeth, and another (the female dauw) 

 may be furnished with a kind of udder and four 

 mammae. * The whole family is distinguished from 

 all other mammalia by the bones at the extremity 

 * Capt. Harris's Sporting Expedition in South Africa. 



