TADPOLES AND FROGS. 
189 
limbs are attached to the axial skeleton through the 
pelvic girdle. The bones of the arm consist of the 
humerus , or forearm, the radio-ulna , corresponding to 
Fig. 146.—Various Stages of Tadpole. 
the two bones, the radius and idna in man, the carpal 
or wrist-bones, the metacarpal or hand-bones, and the 
fingers or phalanges. In the leg are the femur or 
thigh-bone, the shin-bone corresponding to the tibia 
Fig. 147.—Young Frogs. 
and fibida in man, the tarsal bones, two of which are 
much longer than the others, the metatarsal or ankle- 
bones and the phalanges (Fig. I 5 2 )- 
Controlling the organs of motion and extending into 
