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FIRST BOOK or ZOOLOGY. 



bubble of air, which may be seen escaping from the breathing- 

 orifice, as in Fig. 14, B. 



t e e t 



A view fi'om the back, 

 or dorsal vieio. 



aide view. 



ventral view. 

 1 1. Tentacles. 

 e. Eyes. 



/>, Breathing-orifice. 

 i«, Mouth. 



Fig. 13. — A Feesh-Watek Snail seen from above, fkom the Side, and from below. 



