No. of
Family. Genus. Species. Distribution.
27. Helix 1,600 }
Succinea 68 } World-wide--on land in moist places.
Bulimus 650 }
Achatina 120 World-wide--burrowing at roots and
bulbs.
Pupa 236 World-wide--amongst wet moss.
Clausilia 400 Europe and Asia--in moist spots.
28. Limax 22 Europe and Canaries--on land in damp
localities.
Testacella 3 S. Europe, Canaries, and Britain--
burrowing in gardens.
29. Oncidium 16 Britain, Red Sea, Mediterranean--on
rocks on the seashore.
30. Limnaea 50 Europe, Madeira, India, China, N.
America--in ponds, rivers, lakes, etc.
Physa 20 America, Europe, S. Africa, India,
Philippines--in ponds, rivers,
lakes, etc.
Ancylus 14 Europe, N. and S. America--in ponds,
rivers, lakes, etc.
Planorbis 145 Europe, N. America, India, China--in
ponds, rivers, lakes, etc.
31. Auricula 50 Tropical--in salt marshes.
Siphonaria 30 World-wide--between high and low water.