MAMMALIA. 



311 



nothing special ; and the radius and ulna are usually present in the 

 fore-arm, though they may be fused with one another, or the ulna 

 may be wanting. 



"ta 



Fig. 222.— A, Fore-leg of Ox {Bos taurtis). B, 

 Hind-leg of Stag (Cervits elaphns). ca, Carpus ; 

 ta Tarsus; c " Canon-bone," composed of the 

 united metacarpals or metatarsals of the third 

 and fourth digits. 



Fig. 223.— Fore-leg of Horse. 

 ca Carpus ; m Metacarjial 

 ofthe third digit: s "Splint- 

 bone," or rudimentary met- 

 acarpal ; 1, First phalanx 

 or "great pastern"; 3, 

 Second phalanx or "small 

 pasteni " ; 3 Third phalanx 

 or "coffin-bone." 



The fore-arm is succeeded by the small bones which compose the 

 wrist or " carpus." These are eight in number in Man, but vary in 

 different Mammals from five to eleven. 



The metacarpus in Man and in most Mammals consists of five 



