58 ELEMENTS OF MAMMALIAN ANATOMY. 



radius, cuneiform, unciform, magnum, trapezoid, and tra- 

 pezium. The cuneiform articulates with the ulna, unci- 

 form, pisiform, and scapholunar. The pisiform is next to 

 the scapholunar in size. It projects prominently laterad 



\JJ 



FIG. 35. GENEALOGY OF THE HORSE. 



F, Forefoot; H, hindfoot; A, forearm; L, leg; I, Orohippus; //, 

 Mesohippus; III, Miohippus; IV, Protohippus; V, Pliohippus; VI, 

 Equus; 2, 3, 4, and 5 are the second, third, fourth, and fifth digits 

 respectively; me, metacarpus; mi, metatarsus; p, phalanges; u, 

 ulna; r, radius; t, tibia; f, fibula. (After Marsh.) 



