694 



MAMMALIA. 



cealed. At night they come on land and browse on grass and 

 herbage. The skin is extremel)' thick, with a few hairs restricted to 

 the snout, head, neck, and tail. There are four toes on each foot, 

 all reaching the ground. The rootless incisors continue growing ; 



2-3, 143 

 so do the large curved canines ; the dental formula is ■ 



1-3. 143 



The stomach has three chambers ; there is no ccecum. 



Suida; : — The Old \\'orld boars and pigs, characterised by the mobile 



snout and terminal nostrils. There are four well-developed digits 



on the narrow feet, Init the second and fifth do not reach the 



Fig. 249. — Foot of Ox. 



«., A.'^tragalus ; c, o.'^ c.ilcis ; 

 in.t., cannon bone (fused third 

 and fourth nietataivsals) ; //;., 

 phalanges. 



■» 3 



Fig. 250. — Fore leg of Tig. 



/;., Huiiierus ; r., radius; u., ulna; 

 .^., scapiioid ; /.. hni.ar ; c'., cuneiform ; 

 /., tr.apezoid ; in., os magnum; ;<., 

 unciform ; 2-5, die;its. 



ground m walking. The incisors are rooted, the upper canine 

 curves outw.ards or upwards. The stiniiacli is almost simple, but 

 has more or less of a cardiac pouch ; there is a cecum. 



F.Naniples :— 5//,s ---- ; Bahirusa 7 -• the male with remarkable 

 canines, the upper pair growing upwards from their base 



