THE RABBIT. 281 



scaphoid and lunar bones (§ 87) : the ventral (posterior) 

 surface of the shaft is flattened, and fits against the 

 ulna. In the young animal both extremities consist of 

 epiphyses. 



86. The ulna, or longer bone of the fore-arm : it is 

 immovably articulated, though not ankylosed, to the radius, 

 in the position of pronation, its anterior surface being 

 flattened for the reception of that bone. At the proximal 

 end of the same surface is the sigmoid cavity for the 

 articulation of the humerus : beyond this the bone is pro- 

 duced into the olecranon or anconeal process. At its 

 distal end the ulna presents a convex surface for the 

 articulation of the cuneiform (§ 87). In the young animal 

 the whole distal end of the bone is formed of an epiphysis : 

 the proximal epiphysis is small, consisting of a nodule on 

 the olecranon. 



87. The carpus, consisting of a proximal and a distal 

 row of small nodular bones. The bones of the proximal 

 row, beginning from the pre-axial (inner) side, are sca- 

 phoid (radiale), and lunar (intermedium), articulating 

 with the radius, cuneiform (ulnare), articulating with the 

 ulna, and pisiform (a sesamoid), articulating with the 

 ventral (palmar) side of the cuneiform and with the ulna. 

 In the distal row are five bones, the central one of which 

 is distinctly proximal to the other four, and really con- 

 stitutes by itself a middle row ; this, is the centrale, 

 the others being trapezium (carpale i), on the pre-axial 

 side, then trapezoid (carpale 2), magnum (carpale 3) 

 situated immediately to the post-axial side of the centrale, 

 and unciform (carpalia 4 and 5) on the post-axial side. 



88. The metacarpus, consisting of the five meta- 

 carpal bones, of which that belonging to the first or pre- 

 axial digit (poUex) is the shortest, the fifth somewhat longer. 



