290 



INDEX. 



on changes of level, 30. 

 on salt-water killing snails, 40. 

 on dispersal of eggs of fresh- 

 water shells, 46. 

 on dispersal by water-beetles, 



on the stocking of oceanic 



islands, 92, 164. 

 on the antiquity of land -shells, 



on voluntary migration, 116. 

 on hypothetical continents, 1 18. 

 on the want of evidence of 

 exact modes of diffusion, 118. 

 on dispersal by rivers and 



floods, 138. 

 by wind, 145, 152. 

 by birds, 159. 

 Ward, James, on tenacity of life in 



a snail, 107. 

 Ward, John, living shells found in a 



bird's crop by, 161, 163. 

 Wardian cases, dispersal in, 198, 



207. 

 Warren, Miss, on dispersal by cattle, 

 156. 

 on Bidiinus exilis in Ireland, 

 258. 

 \\ arren, R., on a cockle clinging to 



a dunlin, 59. 

 Wars, dispersal during, 203. 

 Water, dispersal with. See Currents. 



isolated. See Ponds. 

 Water-beetles. See Beetles. 

 Water-bugs. See Corixa, Nepa, 



and Notonecta. 

 Water-butt, shells in, 20. 

 Water-pipes, shells in, 18. 

 Water-rails caught by oysters, 60. 

 Water-scorpion. See Nepa. 

 Water-vole trapped by a mussel, 



Watson, R. B., on introduced 



molluscs in Madeira, 179. 

 Watson, W., on Physa aaita at 



Kew, C25. 

 Webb, C. J., whirlwind described 



by, 150. 

 Weir, J. J., on tenacity of life in the 



desert snail, 104. 

 Wells, Artesian, 22. 



Welton-le-wold, isolated pond at, 



9, 10. 

 Westgate, W. W., on dispersal with 



plants, 195. 

 Wheatears, earth on feet of, 159. 

 Whinchats, earth on feet of, 159. 

 Whirlwinds, 42, 149, 174. 

 White slug. See Li?nax agrestis. 

 Whitelegge, Mr., bivalves clinging 



to water-bugs, 63. 

 to water-beetles, 65. 

 Widgeon, probable dispersal by, 50. 

 Wildman, J. R., on Planorbis dila- 



tatus at Burnley, 224. 

 Wilson, G. F., on Btdimzn goodallii, 



231. 

 Wind, dispersal by, 42, 145, 174. 

 Wolds,isolated ponds of, in Lincoln- 

 shire, 9. 

 in Yorkshire, 10. 

 Wollaston, T. V., on the absence 



of fresh-water shells from St. 



Helena and the Azores, 93. 

 on tenacity of life in snails, 



109. 

 Wood, dispersal with. See Timber. 

 Woodcock, cake of earth on the leg 



of, 54, 158. 

 Woodlouse, a snail carried by, 155. 

 Wood-pigeon. See Pigeon. 

 Woodruffe- Peacock, E. A., on 



mussels clinging by closure, 



57. 

 Woodthorpe, E., shells collected 

 from an isolated pond by, 

 12. 

 frogs with shells attached ob- 

 served by, 74. 

 Woodward, S. P., on isolated colo- 

 nies of land-shells, 95. 

 on tenacity of life, 105, 106, 



113- 



on dispersal by sailors, 203. 



on Dreissena polymorpha and 

 Testacella maugei in Britain, 

 213, 229. 

 Worms, living, ejected from the 



crops of birds, 164. 

 Wotton, F. W., on Bulimus good- 

 allii, 231. 



on Helix carthaginiensisy 253. 



