208 



MOLLUSKS: GASTEROPODS. 



Fig. 409. — Helix. 



Fig. 413. — Succinea. 

 Western States. 



Fig. 411. — Chrysalis 

 Shell or Pupa. 



Florida. 



Fig. 410. — Bull- Fig. 412. — Slug, or Fig. 414. — Helix. North- 

 mus. California. Limax. N. England. em States. 



Fig. 416. — Planorbis. 

 United States. 



Fig. 415. — Physa. 

 United States. 



Fig. 417. — Limnsea. 

 United States 



they eagerly devour the green confervse that grow on 

 the sides of the glass. 



