290 



THE MANUS. 



[CHAP. 



It is extremely broad and strong, its breadth being increased 

 by the great development of the radial sesamoid (rs), which, 

 being sickle-shaped, has received the special name of os 

 faldforme. The ungual phalanges are very large, and cleft 

 at their extremities 



FIG. 95. Bones of fore-arm and manus of Mole (Talpa europccd) X 2. R radius 

 U ulna ; s scaphoid ; / lunar ; c cuneiform ; p pisiform ; unciform ; m magnum : 

 id trapezoid ; tin trapezium ; ce central ; rs radial sesamoid (falciform) ; i v ihc 

 digits. 



In the CHIROPTERA, the hand is especially modified in a 

 totally different manner, constituting the organ of flight. 



In the carpus the scaphoid and lunar are united, and in 

 some genera (as Ptcropus) the cuneiform is joined with them, 

 so that the proximal row contains but a single bone. There 

 is no centrale. The pisiform is very small. 



