170 



FIRST BOOK OF ZOOLOGY. 



152. If the legs of the salamander are now examined, the 

 following characteristics will be noticed : 



Fig. 151. — A Veetebba and a Path, of Ribs, from a Cat. — C >?, Cavity for Cerebro-eplnal 



Cord. 



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 joiat 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 \)asi 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 

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

 bones closely packed together; these are called the ta/rsal 

 hones, and together form the ta/rsus. In the body of the 

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



