208 



MOLLUSKS: GASTEROPODS. 



Fig. 409. Helix. 



Fig. 411. Chrysalis 

 Shell or Pupa. 



Florida. 



Fig. 410. Buli- Fig. 412. Sing, or 

 mus. California. Liinax. N. England. 



Fig.416. Planorbis. 

 United States. 



Fig. 415. Physa. 

 United States. 



Fig. 413. Succinea. 

 Western States. 



Fig. 414. Helix. North- 

 ern States. 



Fig. 417. Limnaea. 

 United States 



they eagerly devour the green confervas that grow on 

 the sides of the glass. 



