The Dispersal of Shells: An Inquiry Into the Means of Dispersal Possessed by Fresh-water and Land Mollusca

adhering alive Ancylus animals Anodonta aquatic aspersa attached Binney birds bivalves British Conchology Bulimus canal carried Clausilia clinging colony Conch Conchology creatures Darwin distances distribution doubt Dreissena polymorpha Edition eggs epiphragm fauna feet floating frequently Fresh-water Mollusks fresh-water shells garden Gray's Turton habitat Helix Helix aspersa Helix pomatia Helix vermiculata Hist indigenous inhabiting insects instance introduced islands J. G. Jeffreys Jeffreys Journ kinds Land and Fresh-water land-shells large numbers larvæ legs Limnæa peregra Lyell Manchester means of dispersal mentioned migration miles molluscs mussel Musson Naturalist Nature neighbourhood numbers observed occasionally occurred ocean operculum Origin perhaps Pisidia Pisidium Planorbis Planorbis carinatus plants pond possibly probably Proc quoted recorded remarked rivers S. P. Woodward Science Gossip seems seen slugs snails species Sphærium corneum Sphærium lacustre Standen stream Terrestrial air-breathing Mollusks Testacella tion toes Trans transportal trees Unio Wallace water-beetle Zoologist