Family ENDODONTIDAE 



Shells with low spire, thin lip; often dull or with color mark' 



ings; margin of foot grooved, sole ungrooved 



Common genera ■ — ■ Anguispira Punctum 



Discus Radiodiscus 



Helicodiscus 

 Family SUCCINEIDAE 



Very thin shells, with small spire and large body whorl and 



aperture 



Common genera — Succined Oxyloma 



Family STROBILOPSIDAE 



Minute; parietal wall with several entering lamellae; foot not 



grooved 



Common genus — Strohilops 

 Family PUPILLIDAE 



Small or minute; shell almost cylindrical; lip reflected; aperture 



contracted by teeth or lamellae; with one or two pairs of 



tentacles 



Common genera — Gastrocopta 'Vertigo 



Pupilla Ster\ia 



Pupoides Pubisoma 



Chaenaxis Columella 



Family VALLONIIDAE 



Minute; shells heliciform, with three or four whorls; foot not 



grooved 



Common genera — Vallonia Zoogenetes 



Planogyra 

 Family CIONELLIDAE (COCHLICOPIDAE) 



Small, slender shells, with thin lip and base of columella some- 



what twisted; foot not grooved 



Common genus — Cionella 

 Family PHILOMYCIDAE 



Slugs with no vestige of shell and with mantle covering most 



of the back; respiratory pore above margin of mantle 



Common genera — Philomycus Pallifera 



Family LIMACIDAE 



Slugs; no external shell, but sometimes with a vestige of one in 



the mantle; mantle exterior; foot smooth 



Common genera — Limax Milax 



Deroceras 

 Family ARIONIDAE 



Slugs; sometimes with vestige of shell; mantle anterior; foot 



with marginal furrows 



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