82 



The Alligator and Its Allies 



scapula. The coracoid is a flattened bone, wide 

 at cither end and narrow in the middle, so that in 

 a dorsal view it is shaped like an hourglass. It 

 is decidedly curved, with the convex side down. 



Its outer edge ar- 

 ticulates with the 

 scapula and is 

 thickened to form 

 the anterior border 

 of the glenoid cav- 

 ity. Its median 

 end is attached to 

 the sternum. Near 

 its scapular articu- 

 lation there is a 

 well-marked fora- 

 men that passes 

 entirely through 

 the bone. The 

 episternum (e) or 

 in tercla vicle was 

 described in con- 

 nection with the 

 sternum and ribs. 

 There is no clavicle nor other coracoid elements. 



The anterior limb consists of the usual parts, — 

 the upper arm, forearm, and manus. The hti- 

 merus (Fig. 27, h) is rather thick in proportion to 

 its length; it has an elongated articular surface at 

 its proximal end for articulation with the glenoid 



Fig. 27. Pectoral Girdle and 

 Anterior Limb, 



c, coracoid; ce, centrale; cl, claw; e, episternum; 

 h, humerus; m. metacarpals; p, pisiform; r, 

 radius; r', radiale; s, scapula; u, ulna; 

 u' , ulnare. 



