372 



CHORD AT A. 



front-limb is greatly developed, and in the caudal vertebrse 

 of the frog (urostyle), in which the hind-limbs are enlarged. 



Fig. 264. — Ventral View of Sternum of the Pigeon. 

 {Ad nat. ) 



Coracoid Groove. 

 Costal Ridge. 



Manubrium. 



Carina. 



Posterior Xiphoid' 

 Process. 



Fontanelle. 



Fig. 265.— The Pectoral Girdle of the Pigkon. 

 {Ad nat.) 



Left Clavicle, 

 Right Clavicle. - 



Episternuni. 



The shoulder-girdle is formed of three elements, the 

 clavicle, coracoid and scapula. Of these the clavicle is slender 

 and joined to its fellow by fusion with an epister?iuin. The 



