148 



ANARTHROPODA 



FIG. 173. Forest snail show- 

 ing the two tentacles with 

 an eye on the end of each. 

 Photograph from life. 



FIG. 172. Pond snail and two of its egg 

 masses. The one on the right is entirely 

 withdrawn in its shell. Photograph from 

 life natural size. 



FIG. 174. Photograph of the big slug one half natural size. 



