352 
Fig. 250.—PELVIC 
llium. 
CHORDATA. 
GIRDLE OF RANA. 
(Lateral view.) 
Fig. 251.—HINb-LimB oF Rana. 
({ Phalanges of 
Digits. 
Metatarsals, 
Prehallux. 
Calcaneum. 
Astragalus. 
Tibiofibula. 
Note elongation of tarsal bones, fusion of 
tibia and fibula and presence of six digits. 
Pubis. 
which meet in the mid-ventral 
line and there bear an omo- 
sternum in front and a xiphi- 
sternum behind. They meet 
laterally with the scapula or 
dorsal 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 chum 
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 “a 
and fibula are fused. In 
addition, the two proximal 
tarsal bones, the astragalus 
and calcaneum, are elongated 
into long bones. On _ the 
