286 SKELETON OF THE EABBIT 



ventral surface to form the shallow glenoid 

 cavity, with which the head of the humerus 

 articulates. 



Of the three borders, the anterior or 

 coracoid border is nearly straight; the pos- 

 terior or glenoid is sHghtly concave ; . and the 

 dorsal or suprascapular, which is the shortest 

 of the three, is convex and supports the car- 

 tilaginous snprascapula. 



The spine is a prominent ridge running 

 along the outer surface of the scapida, nearly 

 parallel to and a short distance behind the 

 coracoid border. It is continued ventrally 

 into a free, downwardly directed process, the 

 acromion, from the posterior border of which 

 the long metacromion projects backwards. 



The coracoid border is continuous below 

 with the coracoid process, which overhangs 

 the glenoid cavity, and is produced inwards 

 into a blunt hook. This is the sole represen- 

 tative of the coracoid portion of the pectoral 

 girdle, and is a distinct bone in the young 

 rabbit, 

 ii. The clavicle is a slender curved membrane-bone, 

 rather less than an inch in length, and formed 

 by ossification in the ligament running from 

 the scapula to the sternum. 



B. The Fore-Limb. 



The fore-limb of the rabbit corresponds to the arm of 

 man, and may be divided, Uke this, into arm, forearm, wrist 

 and hand. The relative positions of these several divisions 

 are considerably altered from the primitive condition, and are 

 best understood by comparing them with the human arm in 

 the following manner. 



Extend the right arm horizontally outwards from the 

 shoulder, with the palm of the hand vertical and the thumb 

 upwards : there may now be distinguished a ventral or flexor 



