INDEX. 



^71 



Esparto-grass, possible dispersal 

 with, 254. 



Establishment of new colonies, 

 difficulties attending, 82, 96, 

 119, 122, 164, 175. 



European snails, exported as delica- 

 cies, 203. 

 carried by ships as part of pro- 

 visions, 203. 

 widely dispersed by man, 178. 



Faunas, insular, richness of, in- 

 creased by time, 123. 



Fewkes, J. W., on a bivalve cling- 

 ing to a duck, 80. 



Field-slug. See Limax agrestis. 



Fierke, F. W., on an isolated pond, 

 10. 



Finchley, isolated ponds at, 13. 



Fish, showers of, 43. 



dispersal of fry of Unionidce 



by, 48. 

 bivalves closing upon, 58. 

 possible dispersal with, by 

 human agency, 226. 



Fish-ova, dispersal with, 195. 



Fleming, J., on Dreissena poly- 

 morpha and Helix pomatia 

 in Britain, 213, 238. 



Floating of certain land-shells in 

 water, 140. 



Floating husks, dispersal by, 133, 



134- 

 Floating ice, dispersal by, 41, 123. 

 Floating islands, 129, 136, 137, 



174. 

 animals seen on, 130. 

 pumas landed by means of, 130. 

 Lyell on the landing of, 13 1, 



136, 174. 

 Floating molluscs, dispersal of, 35. 

 Floating pumice, 142, 139, 174. 

 Floating timber. See Timber, 



floating. 

 Flood-water, shells in, 33. 

 Floods. See Currents. 

 Flower-pots, dispersal in, 200. 



Food, dispersal of molluscs for, 



203, 235, 236, 240, 257. 

 Forbes, E., oceans bridged over by, 

 117. 

 on dispersal by means of canals, 



196. 

 on dispersal by man, 209. 

 on Helix pomatia in Britain, 



239. 

 Helix aperta found in Guern- 

 sey by, 256. 



Forbes and Hanley, on Dreisseiia 

 polymorpha and Helix po- 

 f/ialia in Britain, 213, 240. 



Ford, John, on dispersal with 

 bananas, 201. 



Ford, Mr. (Redhill),on a mussel 

 clinging to a sandpiper, 79. 



Fountains in Trafalgar Square, 

 shells in, 22. 



Fowler, Canon, on the flying habits 

 of water-beetles, 66. 



Foxes, mussel and oyster closing 

 upon the tongues of, 58. 

 snail-colonies probably exter- 

 minated by, 187. 



Frankfort, Helix acuta carried to, 

 200. 



Franklin, Dr., a whirlwind de- 

 scribed by, 149. 



French men-of-war, dispersal of 

 " escargots " by, 205, 206. 



French sailor, the Guernsey speci- 

 men of Helix aperta per- 

 haps dropped by a, 257. 



Fresh-water limpets. See Ancy- 

 liis. 



Fresh- water mussels. See Ano- 

 donta and Unio. 



Fresh-water organisms, derived from 

 the sea, 3. 

 destroyed by changes of level, 

 99. 



Fresh-water shells. See Molluscs. 



Fresh-waters, want of continuity of, 

 98. 



Frogs, showers of, 43, 44. 



living bivalves in stomachs of, 



45- . . 



bivalves clmgmg to, 72, 70. 

 wandering habits of, 75. 



