IV.] 



SKELETON OF UPPER LIMB. 



171 



The saddle-shaped surface for articulation with the first 

 metacarpal is not so well developed in any other form as it is 

 in man. 



The trapezium may be quite rudimentary, as in CJi<zropus, 





FIG. 145. BONES OF MANUS OF Chcerofitis castanotis. 



c, cuneiforme ; /, lunare ; m, magnum; R, radius; s, scaphoides; id, trape- 

 zoides ; tin, trapezium ; U, ulna, it, uncifonne ; //., ///., and IV., second, 

 third, and fourth digits. 



(From Flower's " Osteology"} 



or altogether wanting, as in the Horse, Sheep, Pig, Dolphin, 

 Salamander, &c. 



As to Birds, no distinct trapezium is distinguishable ; and 

 the same is the case with Crocodiles, but a trapezium exists 

 in many Lizards. As has been said, it may, as in the Three- 

 teed Sloth, coalesce with the scaphoides. 



The trapezoides is a more constant bone than is the pre- 

 ceding one, as it seems to exist in all Mammals which have 

 a carpus, though its existence is not to be made out in Birds, 

 or clearly so in Crocodiles. It may be relatively smaller or 



