I04 



Elementary Zoology. 



appears as if there were a bony procoracoid as well as a bony 

 coracoid; the distinctness of the anterior bony bar must be 

 borne in mind. The so-called sfermim of the frog consists of 

 an anterior bit, the omosternum, lying in front of the coracoids, 

 and formed by a forward growth of the epicoracoids. The 

 hinder part of the sternum (the xiphisternum) is formed in- 



P.o.a 



Fig. 46. — Hand of Frog. (After Howes and Ridewood.) 



K.u, fused radius and ulna : n, naviculare (centrale) ; l, lunare (radiale) ; 

 p, ulnare ; p.o.i, carpal of pollex ; v.0.2j metacarpal of poUex ; 2-4, 

 carpals of digits 2-4 ; 2-5, metacarpals. 



dependently of two pieces of cartilage, which fuse into a single 

 piece, and become partly ossified. We shall see later that this 

 part alone can be fairly termed sternum. 



The limb itself consists of a single bone, articulating with 

 the glenoid cavity, the htmierus ; of two bones lying side by 

 side and fused together, which articulate with this, the radius 



