THE FORE-LIMB. 329 



preaxial side of the wrist : it articulates with 

 the radiale, and supports the first metacarpal. 



ii. The second carpale, or trapezoid, articulates 

 with the radiale and centrale, and supports 

 the second metacarpal. 



iii. The third carpale, or os magnum, is very small : 

 it articulates with the intermedium, the cen- 

 trale, and the third metacarpal. 



iv. The fourth and fifth carpalia are fused to form 

 the unciform bone, which is much larger : 

 it articulates with the ulnare, and supports 

 the fourth and fifth metacarpals. 



d. The pisiform is a small bone on the posterior or 

 flexor surface of the carpus, and articulates with 

 the distal end of the ulna and with the ulnare. 



The hand in the rabbit has five digits, as in man : 

 the bones of each consist of a proximal metacarpal, 

 followed by the phalanges, the last of which, the 

 ungual phalanx, is conical and slightly curved, and 

 supports the claw. 



The pollex, or preaxial digit, corresponding 

 to the thumb in man, is much shorter than the 

 others, and has only two phalanges, while each of 

 the other digits has three. 



Sesamoid bones are developed in the tendons 



Fig. 62. Lepus cuniculus. Skeleton of the left hand, extensor sur- 

 face. The pisiform bone is not seen in this view. Natural size, 

 (c. H. H.) 



A, radius. B, epiphysis of radius. C, ulna. D, epiphysis of ulna. E, 

 radiale. F, intermedium, g, ulnare. H, centrale. K. 1, K. 2, K. 3, first 

 three carpalia. K. 4, unciform bone. M.1,M.2, M. 5, first, second, and fifth 

 metacarpals. PA, proximal phalanges of first and fifth digits. PB, PC, middle 

 and ungual phalanges of fifth digit. T, claw. 



Fig. C3. Lepus cuniculus. Skeleton of the left foot, extensor surface. 

 Natural size. (c. h. h.) 



E, astragalus. G, calcaneum. H, naviculare. K, process representing 

 first tarsale. K. 2, K- 3, second and tnird tarsalia. K- 4, cuboid. M. 1 , M- 2, 

 first (rudimentary) and second metatarsals fused together. M. 5, fifth meta- 

 tarsal. PA, PC. proximal and ungual phalanges of second toe. T, claw 

 enclosing ungual phalanx of fifth toe. 



