208 



MOLLUSKS: GASTEROPODS. 



Fig. 409. Helix. 



Fig. 413. Succinea. 

 Western States. 



Fig. 411. Chrysalis 

 Shell or Pupa. 



Florida. 



Fig. 410. Buli- Fig. 412. Slug, or Fig. 414. Helix. North- 

 mus. California. Limax. N. England. era States. 



Fig. 416. Planorbis. 

 United States. 



Fig.415.-Physa. 

 United States. 



Fig. 417. Lirrnuea. 

 United States 



they eagerly devour the green confervse that grow on 

 the sides of the glass. 



