﻿170 



FIRST BOOK OF ZOOLOGY. 



Fig. 151.— A Vertebra and a Pair of Ktbs, from a Cat — C S, Cavity for Cerebro-spinal 



Cord. 



152. If we compare the hind-leg of the salamander with 

 our own leg, we shall find essentially the same arrangement 

 of parts, namely : the leg bending at a joint in its middle, or 

 the knee-joint, and below this joint another one called the 

 ankle-joint. In that portion of the leg above the knee-joint 

 there is one long bone called foe femur which joins or articu- 

 lates with the pelvic arch. In the leg below the knee-joint 

 there are two long bones side by side, called the tibia and 

 fibula. In the ankle-joint there are a number of small 

 bones closely packed together; these are called the tarsal 

 bo?ies, and together form the tarsus. In the body of the 

 foot there are several bones upon which the toes rest, and 



