XIII 



THE SKELETON 



239 



portion, the suprascapular which is composed of cartilage 

 which is more or less calcified at the base. The supra- 



FlG. 67. — Middle part of the shoulder girdle of the frog from below. Co, 

 coracoid ; Co', epicoracoid ; CI, clavicle; Ep, episternum ; G, glenoid 

 cavity; Fe, fenestra; AC, cartilage between scapula and clavicle; Kn, 

 xiphisternum ; m, junction of epicoracoids ; S, scapula; .S/, sternum. 

 (After Wiedersheim.) 



scapula articulates below with the long scapula, which is 

 oblong and constricted in the middle ; the posterior sfde of 

 the lower end forms part of the glenoid fossa, which receives 

 the head of the humerus. A notch occurs at the glenoid 

 fossa, dividing the lower end of the scapula into dorsal or 

 gle noid part from a ventral aero mial portion. 



From the lower end of the scapula two bars extend 

 toward the middle line. The anterior of these consists of 

 a bar of hyaline cartilage, the procoracoid, in front of, and 



