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.MANUAL OK ZOOLOGY 



bearing teeth ; near the mouth are a pair of smaller aper- 

 tures — the nostrils or nasal apertures, and at the sides 

 of the head region are the pair of conspicuous eyes ; 

 while further back the pair of prominent auricles or pin- 

 nje, with the wide apertures at their bases, mark very 

 conspicuously the position of the auditory organs in the 





Fig. 207. — Lacerta viridis. (After Brehm.) 



rabbit, less clearly indicated in the lizard, and still less 

 in the dogfish. On the lower (ventral) surface, towards 

 the posterior end of the trunk, will be observed in all three 

 apertures which serve as the orifices through which the 

 intestine and the ducts of the urinary and genital organs 

 communicate with the exterior. A further resemblance 



