XII 



PHYLUM CHORDATA 



331 



digits, each of which is provided at its extremity with a 

 curved and pointed horny claw. Slight rhythmical move- 

 ments of dilatation and contraction of the anterior portion 

 of the trunk are the movements of respiration by means 

 of which air is alternately drawn into and expelled from the 

 lungs through the nostrils. 



In the Rabbit (Fig. 194) the place of the scales of the 

 Lizard is taken by the coating of hairs constituting the 



// JI 



FIG. 194. Rabbit. Lateral view of skeleton with outline of body. 



fur. The limbs present the same main divisions as in the 

 Lizard, though the proportions of the parts are very different, 

 and the hind foot has only four toes. Between the head and 

 trunk the neck-region is more sharply marked off than in the 

 Lizard. Arising from the posterior part of the head, behind 

 the eyes, are a pair of very prominent auditory pinnce or 

 auricles, at the base of each of which is the corresponding 

 ear-opening. Movements of respiration resembling those of 

 the Lizard, but much more marked, are to be detected in 

 the living animal. 



