410 



LAND MAMMALS IN THE WESTERN HEMISPHERE 



fibula is lost, except the lower end, which is a 

 separate malleolar bone. There is always, in 

 both fore and hind feet, a cannon-bone, the 

 lower ends of which are 

 parallel, not divergent, as 

 they are in the Tylopoda, 

 and each articular surface 

 is encircled all around by a 

 prominent median keel, as 

 in the horses, which in the 

 other suborders, as in mam- 

 mals generally, is confined 

 to the posterior side and 

 not visible from the front. 

 (C/. Figs. 220 and 214, p. 

 401.) In no existing mem- 

 ber of the Pecora are there 

 complete lateral digits, and 

 in several modern genera 

 they have been completely 

 suppressed ; but in most 

 there is, behind the func- 

 tional pair of digits, a pair 

 of "dew-claws," the bones 

 ^ , of which are more or less 



Fig. 219. — Left manus 



of Patagonian Deer Completely reduced, often 

 (Hippocameius bisui- ^^ ^^^^ nodules. The 



cua). S., scaphoid. 



L., lunar. Py., py- stomach, wMch in the Tylo- 

 o^fied trapto^'and Poda and TraguUna is three- 

 magnum. Un., unci- chambered, is in the Pecora 



form. Mc. II and V, ^• • t ^ • . <■ ^• i_- i_ 



rudimentary second divided intO four dlStlUCt 



and fifth metacarpals. pa,rts. 



Mc. Ill and IV, can- , . , . , i , i 



non-bone. Ph. 1, s, As already intimated, the 

 first and second pha- subdivision of the Pecora 



langes. Ung., ungual 



phalanx. into Smaller groups is far 



M- ur. 



pft.l 



M. 1^ 



Fig. 220. — Left pes 

 of Patagonian 

 Deer. Cal., calcar 

 neum. As., astrag- 

 alus. JV.,C6., co- 

 ossified navicular 

 and cuboid. Ml. 

 Ill, IV, cannon- 

 bone. Other let- 

 ters as in Fig. 219. 



