XIII 



THE SKELETON 



239 



portion, the st/prascapiila, 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; KC, cartilage between scapula and clavicle; Kti, 

 xiphisternum ; m, junction of epicoracoids ; S, scapula; 6'^, sternum. 

 (After Wiedersheim.) 



scapula articulates below with the long scapula, which is 

 oblong and constricted in the middle ; the posterior side 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 

 glenoid i^TixX. from a ventral acromial -^oxXxow. 



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, ihQ procoracoid, in front of, and 



