PULMONIFERA OR LAND SNAILS, ETC. 



415 



As already implied, most of the Pnlmonifera inhabit 

 the land, but some, as LimncBa, Planorbis, Pliywt, etc. 

 (Figs. 602, 601, 600), abound in fresh waters. Some 

 kinds have no operculum ; these are the Helicidse 

 (Helix, Succinca, Bulimus, Achatina, Piqw, Clausilia, 

 etc., Figs. 595, 598, 596, 597), the Limacidae (Limax, 

 etc., Fig. 599), the Oncidiadte (Oneidium, etc.) the Lim- 

 najidae (Limncea, Physa^ Planorbix, etc., Figs. 601-603), 

 and the Auriculidse (Auricula, etc.). 



FIG. 595. 



Helix albolabris, Say. United States. 

 FIG. 597. 



FIG. 598. 



FIG. 596. 



Pupa incana, Say. 

 Florida. 



Succinea nbliqtta, Say. 

 WestiTU States. 



FIG. 600. 



JJulimu* rxcelsus, Gould. Slug, or Limnx rnniftestris, 

 California. Now England. 



Helix albolabris, Say. 



