PERISSODACTYLA. 



699 



greater extent with the navicular than with the cuboid. 

 The last-named bone is of less importance than in the 



//"-.; I [ 



FIG. 254. Side view of 

 lower part of Pony's fore 

 leg. (From Edinburgh 

 Museum of Science and 

 Art.) 



h, Distal end of humerus; u, 

 olecranon process of ulna ; r, 

 radius ; sc, scaphoid ; /, lunar ; 

 c, cuneiform ; m, os magnum ; 

 un, unciform ; p, pisiform ; me. 4, 

 splint of fourth metacarpal ; me. 3, 

 third metacarpal ; s, sesamoid ; 

 i, 2, 3, phalanges of third digit. 



mt. J. 



ph 3. 



cub. 



FIG. 255. Side view of ankle 

 and foot of Horse. (From Edin- 

 burgh Museum of Science and 

 Art.) 



., Astragalus; c., calcaneum ; ., 

 navicular; e.c., external cuneiform; cub., 

 cuboid ; mt. 3, third metatarsal ; int. 4, 

 splint of fourth metatarsal ; s., sesamoid ; 

 ph. 1-3, phalanges of third digit. 



Artiodactyla. The calcaneum does not articulate with the 

 lower or distal extremity of the fibula. The femur has a 



