4 



GREAT G4ME ANIMALS. 



Suborder PERISSODACTYLA. 



[Low^r 

 Ma nrnal 

 Gallery. 

 Cases 

 37 to 40, 

 and two 

 cases 

 in the 

 central 

 line.] 



In this group the middle, or third, toe of both fore and hind feet 

 (fig. 2) is larger than any of the others and symmetrical in itself, 

 its> centre constituting the middle line or axis of the whole foot. 

 This may be the only toe present, as in Horses (fig. 1), or the second 

 and fourth may be subequally developed on each side of it. In the 

 Tapirs the fifth toe is also present in the fore-foot, but no existing 

 species shows any trace of a first toe. This group at the 



Fig. 1. 



Fig. 2. 



Bones of the Left Fore-foot of a Horse (1) and a Rhinoceros (2). 

 r, radius; u, ulna ; c, carpus ; mc, metacarpus; ph, phalanges. 



present time consists of only three distinct families, the Tapirs, 

 Rhinoceroses, and Horses (including Asses and Zebras) ; all these 

 being poor in genera and species, and evidently, as shown by the 

 evidence of fossil remains, merely the surviving remnants of a very 

 extensive and varied assemblage of animals which flourished on the 

 earth during almost the whole of the Tertiary geological period. 

 The two domesticated species, the Horse and the Ass 5 have been 

 largely multiplied and widely dispersed over the surface of the 



