264 



bulletin: museum of comparative zoology. 



from it. The hoofs of digits iii and iv are united posteriorly by means 

 of a horny pad. 



The carpus (Fig. F) consists of two rows of four bones each ; in the 

 proximal row occur in succession, passing from the radial to the ulnar 

 side, the scaphoid, lunar, cuneiform, and pisiform. In tlie distal row, 

 which chiefly concerns us, the trapezium is most radial in position ; next 



cun. 



III. 



FiQ. F. — Left normal manus of pig, showing carpals and metacarpals, ii-v, meta- 

 carpals; cun., cuneiform; lun., lunar; os mag., os magnum; jns., pisiform; scph., scaphoid; 

 trz. trapezium; <r2(/., trapezoid; m»., unciform, to natural size, 



come in order the trapezoid, os magnum, and unciform. The trapezium 

 (Fig. F, trz.) is rudimentary ; it articulates with the postero-lateral sur- 

 face of the trapezoid and ends distally in a free, pointed process, which 

 projects distad of the proximal extremity of metacarpal ii. The trape- 

 zoid {trzd.) is functional but small. It articulates proximally with the 

 scaphoid, distally with metacarpals ii and in. Its distal extremity is 



