270 



INDEX. 



Confervoid vegetation, shells 



amongst, 52. 

 slug carried by a floating mass 



of, 170. 

 Congo, rafts of, 129. 

 Continental extensions, hypotheti- 

 cal, 118. 

 Continents, general permanence of, 



118. 

 Cooke, A. H., on Helix pisana in 



Guernsey, 190. 

 on Physa acuta at Kevv, 225. 

 Cooper, Thomas, on a shower of 



frogs, 44. 

 Cordeaux, J., shells not seen upon 



birds' feet, by 50. 

 shells noticed among duck- 

 weed by» 52. 

 on shells in birds' crops, 1 60, 



161-2. 

 on dispersal by thrushes, 



165. 

 Corixa, bivalves clinging to, 63. 

 Cormorant caught by an oyster, 61. 

 Cotton, supposed dispersal with, 



221. 

 Cox, C. S. B., on Helix terreitris 



in Britain, 232. 

 Crayfish, bivalves clinging to, 83, 



84. 

 Creation, centres of, i, 2. 

 Cresswell, F., on a tern caught by 



a mussel, 60. 

 Crick, W. D., on mussels clinging 



by closure, 58. 

 on a SphceHiim clinging to a 



water-beetle, 6^. 

 to a frog, 73. 

 Crops of birds, molluscs carried in, 



45, 159, 176. 

 Helix caperala alive in the crop 



of a pigeon, 161, 163. 

 living cockles in the crops of 



curlews, 161. 

 Crow caught by a mussel, 60. 

 Cucumber-house, Bulijtiics goodallii 



in, 231. 

 Cuming, Mr., on a Cyclas probably 



carried by a flood, 33. 

 Curlew sandpiper, cockle clinging 



to, 60. 



Curlews, living cockles in crops of, 



161. 

 Currents, fresh -water, dispersal by, 

 18, 21, 23, 30, 37, 124, 138, 

 169, 170, 224. 

 rate of, in Amazons, 125. 

 marine, dispersal by, y] ^ 120, 



163, 174, 177. 

 rate of, 121. 

 Curtis, J., on dispersal by water- 

 beetles, 67. 

 on tenacity of life in snails, 1 13, 

 114. 

 Cyclas probably carried by a flood, 



33- 



And see Sphcenicm. 

 Cyclones, 149. 

 Cyclophorus indicus, tenacity of life 



of, 114. 

 Cyclostoma (or Clausilia) clinging 



to a bee, 166. 

 Cyclostoma elegans, isolated colonies 



of, 95. 

 reviving after submersion in 



sea- water, 121. 

 Cyclostomas, tenacity of life of, 



113- 



D. 



Da Costa, E. M., on Helix poma- 

 tia in Britain, 235. 



Da Costa, S. J., on Helix ohvoluta 

 in Surrey, 248. 



Dalton, J., on the occurrence of 

 freshwater shells in unlikely 

 spots, 5. 

 on an isolated pond, 17. 

 on the spreading of Dreissena 

 polytnorpha, 220. 



Daniel, Mr., on snails falling from 

 trees with leaves, 147. 



Darbishire, R. D., on tenacity of 

 life in a land-snail, 105. 

 on colonization near Man- 

 chester, 185. 



Darwin, C, on single centres of 

 "creation," i. 

 on land as a barrier to fresh- 

 water shells, 3. 



