MAN AND APES. Ill 



lower Cebidce (from Cebus downwards), though, 

 with the exception of Arctocebus, it is constant 

 in the Half-apes. 



The little bones of the wrist are in man 

 only eight in number, arranged in two trans- 

 verse series. 



The bones of the upper, or proximal row, 

 are : (1) the scapjlioides (or scaphoid bone) ; 

 (2) the lunare (or semi-lunar bone); (3) the 

 cuneiform (or wedge-shaped bone) ; and (4) 

 the pisiform (or pea-shaped bone). 



The bones of the lower, or dictal row, are : 

 (1) the trapezium ; (2) the trapezoides ; (3) 

 the magnum ; (4) the unciform. 



The magnum is the largest bone of the 

 dictal series, while the unciform articulates 

 with and supports two metacarpals, namely, 

 the fourth and fifth. 



The trapezium presents a saddle-shaped 

 surface to the first long bone ((metacarpal) of 

 the thumb, being concave in one direction and 

 convex in another. 



In almost all the other Primates there are 



