2/2 



INDEX. 



of land genera sometimes wid e, 



92. 

 of British land and freshwater 

 shells, " Census " of, 219. 

 Donovan, on Helix pomatia in Bri- 

 tain, 237. 

 Doubleday, H., on wandering of 



frogs, 75. 

 Douglas, R. C, on a bivalve cling- 

 ing to a toad, 74. 

 Dover, Helix tej-restris near, 232, 

 Downs, isolated ponds of, 6. 

 Dragon-fly larva, Sphcerinui cling- 

 ing to, 61. 

 Bythinia clinging to, 85. 

 Drane, R., on a shower of fish, 43. 

 Dreissena polymorpha carried witli 

 water, 18. 

 found in London streets, 18. 

 in water-pipes, 18. 

 dispersal of fry of, 36, 49, 220. 

 sometimes attached to cray- 

 fishes, 84. 

 its rapid diffusion,. 181, 214, 



217, 219. 

 its British history, 210. 

 its tenacity of life, 211. 

 its occurrence in unnavigable 



water, 217. 

 in new water, 220. 

 its range in Britain, 219. 

 Dresser, H. E., shells not seen on 



birds' feet by, 49. 

 Drift-wood. See Timber, floating, 

 Drummond, T., on Testacella 

 ?naugeizxid.Btili}m{sgoodallii 

 in Bi-itain, 228, 230. 

 Dry-bulbs, dispersal with, 198. 

 Duck, a snail's eggs on the foot of, 



47>.i57- 

 experiment with the feet of, in 



an aquarium, 49. 

 a leech clinging to, 50. 

 caught by an otter's shell, 60. 

 by mussels, 77, 79, 80. 

 Ducklings, caught by Uniones, 



77- 

 Duckweed, dispersal with, 51. 

 Dumfriesshire, shower of leaves in, 



148, 153- 

 Dunlins, cockles clinging to, 59. 



Duprey, E., on Aucyhis adhering 



to water-beetles, 87. 

 Durham, Helix villosa and Helix 



lapicida in, 193. 

 Dye-woods, dispersal with, 201, 



202. 

 Dyer, Mrs., on Helix pisatia near 



Swansea, 189. 

 Dyson, Mr., on Dreissena poly- 



ino7-pha in water-pipes, 18. 

 Dytisais^ bivalves clingmg to, d^y 

 et seq. 

 the flying habits of, 66. 

 the carrying powers of, 67. 

 flying with shells attached, 68, 



87. 

 Ancylus adhering to, 86, ^T. 



Eagles, probable dispersal by 



means of, 160. 

 Earth, dispersal with : by birds, 54, 



157- 

 by floating trees, 129, 133, 136, 



169, 171, 174. 

 by cattle, 156. 



by man, 198, 200, 207, 250. 

 Eastbourne, snails in the gardens of 

 the martello towers near, 

 198. 

 Edible snail. See Helix poiiatia. 

 Edible snails, dispersal of, 203, 235, 



236, 240, 257. 

 Eggs, deposited by snails after dor- 

 mant periods, 104, 107, 109, 

 122. 

 oi Limax in a tree-trunk, 173. 

 dispersal of : of freshwater 

 molluscs, 36, 39, 41, 46, 

 124. 

 of land molluscs, 120, 123, 

 124, 126, 138,139, 145, 152, 

 153, 157, 158, 164, 169, 172, 

 173, 174, 200, 207. 

 Erie Canal, molluscs colonized in, 



184. 

 Esmark, Miss, molluscs colonized 

 by, 184, 187. 

 dispersal with ballast, 197. 



