72 



THE HOKSE 



from the rest of the group, and that the others are all 

 more nearly allied to each other than they are to it, and 

 that the zebras, though otherwise closely related to the 

 asses, are distinguished from them and associated together 

 by their style of colouring and geographical distribution, 

 it scarcely seems desirable that such distinctions should 

 be made the ground of difference of generic appellation, 

 and they will in this work all be spoken of as members 

 of the genus Equits. 



The Horse (JEquus caballus, Linn.) is distin- 

 guished from all the others by the long hairs of the tail 

 being more abundant and growing quite from the base 

 as well as the end and sides, and also by possessing a 

 small bare callosity on the inner side of the hind leg, 

 just below the 'hock' or heel-joint, in addition to the 

 one on the inner side of the forearm, above the wrist 

 or 'knee,' common to all the genus. The mane is 

 also longer and more flowing, the front part of it droop- 

 ing over the forehead, constituting the ' forelock ' ; and 

 the ears are shorter, the limbs longer, the feet broader, 

 and the head smaller. 



Though the existing horses are usually not marked 

 in any definite manner, or only irregularly dappled 

 (i.e. j marked with la,rge light spots surrounded by 

 a darker ring), many examples are met with showing 

 a dark streak -running along the centre of the back, like 

 that found in all other members of the genus, and even 



