HORSES 



8S3 



tapirs and some extinct forms by the fifth, digit. No 



mc ^ 



Fig. 505. — Side view of lower 

 part of pony's fore-leg. 



h.. Distal end of humerus ; «., 

 olecranon process of ulna ; r., 

 radius ; sc, scaphoid ; /., lunar ; 

 c, cuneiform ; m., os magnum ; 

 MM., unciform ; p., pisiform ; 

 mc.\, splint of fourth metacar- 

 pal : wic.3, third metacarpal ; 

 s., sesamoid ; i, 2, 3, phalanges 

 of third digit. 



int. 



tcb. 



ph 3 



Fig. 506.— Side view of ankle 

 and foot of horse. 



a.. Astragalus ; c, calcaneum ; 

 n., navicular ; e.c, external 

 cuneiform ; cub., cuboid ; mi.^, 

 third metatarsal ; W/.4, splint 

 of fourth metatarsal ; s., sesa- 

 moid ; ph. 1-3, phalanges of 

 third digit. 



modern forms have any trace of the first digit. The astra- 



