THE TiOXES AND JOINTS. 



III. THE STEBNUM (Fig. 24 es, hs). 



Cuvier, I.e., p. 401, PI. XXiV, Fig. 31 ef. Duges, n. 27, 28. Parker 

 and Bettany, I.e., sternum. 



The bones of the sternum are in very close relationship with the 

 shoulder-girdle, and some difference of opinion exists as to the rela- 

 tions of the several .parts. 



The following parts must be regarded as undoubtedly- 

 belonging to the sternum : 



1. An anterior part, consisting of a bony and a carti- 

 laginous portion. 



a. The omosternum (Figs. 23, 24 e.s.) is a bony 

 rod, wider behind, narrower in front, and supports 



b. The episternum (Fig. 24 es"), a semicircular 

 plate of calcined cartilage, with a thin free border 

 of unchanged hyaline cartilage. 



2. A posterior part, which also consists of a bonv 

 and a cartilaginous portion. 



Fig. 24. e 



Shoulder-girdle and sternum of Rana nculenta, twice int. size 

 The scapula and suprascapula are turned outwards. 



c. Connecting cartilage. /* s. Sternum proper 



i-/. Clavicles and precoraooids. //*' Xiphisternum. 



co Coracoid. a Bone. 



c... Omosternum. "' Calcified cartilage. 



<' Episternum. ">. Srapula. 



/i Ilyaliiii- c'artila'.;.-. 1C 1 Suprascapula. 



