352 



CHORD AT A. 



Prehallux. 



Astragalus. I 



r Metatarsals. 



f Calcaneum. 



Fig. 250. — Pelvic Girdle of Rana. 



Ilium. (Lateral view.) 



Ischiu 



Pubis. • ■ 



Fig. 251.— Hind-Limb of Rana. which meet in the mid-ventral 

 l5 line and there bear an o7no- 



sternum in front and a xiphi- 

 I? ^ 1 sternum behind. They meet 



laterally with the scapula or 

 Phaia^^ges of ^^^^^^ element and form the 



glenoid cavity for articulation 

 of the limb. The scapula 

 carries on its dorsal border a 

 suprascapular cartilage. The 

 fore-limb has two peculiarities. 

 The radius and ulna are united 

 into one bone and there is no 

 pre-axial digit or thumb. 



The pelvic girdle has a very 

 long forwardly-directed ilium 

 articulating with the sacral 

 vertebra. The pubes and 

 ischia are welded into a disc- 

 shaped mass with a concavity 

 on each side, the acetabulum. 

 The frog's pelvic girdle is 

 peculiar in the great length 

 of the ilium and the solid 

 nature of the pelvis. The 

 hind-limb is greatly elongated. 

 As in the front-limb, the tibia 

 and fibula are fused. In 

 addition, the two proximal 

 tarsal bones, the astragalus 

 and calcaneum^ are elongated 



es, lusion or • . , i r\ l\^ 



of six digits, into long bones. On the 



Tibiofibula 



Femur. 



Note elongation of tarsal bones^, fusion of 

 tibia and fibula and presence 



