CHAPTER XXVI. 



Ungulates, — continued. 



Tapirs, Rhinoceroses, and Horses. 



With the three groups of animals known as tapirs, rhinoceroses, and horses, we 

 come to an assemblage of Ungulates differing in many important respects from all 

 those described in the preceding chapters, and collectively constituting a distinct 

 primary division of the order to which they belong. The most obvious external 





SKELETON OF MALAYAN TAPIR. 



characteristics of this assemblage of animals are displayed by their feet, in which, as 

 we have already had occasion to mention (p. 153), the toe corresponding to the third 

 or middle finger of the human hand, or to the middle toe of the human foot, is always 

 larger than either of the others, and is symmetrical in itself. This peculiarity of 

 foot-structure is exhibited in the accompanying figure, and likewise in the smaller 

 figures on p. 455 ; and how essentially different it is from the type of foot obtaining 

 in the even-toed Ungulates will be apparent by contrasting these figures with the 

 illustration of the foot of the pig given on p. 422. In all the Even-toed Ungulates, 

 we may once again remind our readers, instead of the third toe being symmetrical 

 in itself and larger than either of the others, it is symmetrical to a line drawn 

 between itself and the fourth toe, and is equal in size to the latter, with which it 

 forms a pair. 



Although in the members of the present group the number of toes in the foot 

 is frequently three, it may be increased to four or diminished to one ; yet in all 



