THE PIGEON. 203 



98. The carpus, or proximal division of the manus, con- 

 sisting of two short bones, the smaller (radiale, Fig. 49, 

 cp.i) articulating with the radius, the larger (ulnare, cp.2) 

 with the ulna. 



99. The metacarpus or middle division of the manus, 

 consisting of (a) a large cylindrical bone, the second meta- 

 carpal (mcp.2); (b) a slender curved bone, the third 

 metacarpal (7^.3), on the post-axial side of the second, 

 to which it is ankylosed at its extremities, its shaft remaining 



Ta 



ill 





fk? 



FIG. 49. Columba livia. The left manus of a nestling (about four- 

 teen days old), viewed from the outer (dorsal) surface ( x 2). 



The cartilaginous parts are dotted. 



cp.i, radial, and cp.2., ulnar carpal : mcp.i, first, mcp.2, second, and 

 mcp.3, third, metacarpal : ph. I, phalanx of pollex : ph. 2, proximal, and 

 ph.2.', distal phalanx of second digit : ph. 3, phalanx of third digit : ra, 

 radius :'/, ulna. 



free; (c) the first metacarpal (mcp.i), forming merely a 

 projecting process on the pre-axial border of the proximal 

 end of the second. 



100. The phalanges, forming the distal division of 

 the manus: one pointed bone (ph.i), attached to the 



