CONTENTS. XV 



16. Canadian Kegion : New England 398 



17. Atlantic States 399 



18. American Hegion 400 



19. Oregon AND California 400 



20. Mexican Eegion 401 



21. Antilles 401 



23. Columbian Region : Galapagos 402 



23. Brazilian Eegion 403 



24. Peruvian Region 404 



25. Argentine Region 404 



26. Chilian Region : Juan Fernandez 405 



27. Patagonian Region : Fuegia, Palklands 406 



Estimate of Species in eacli Province 407 



CHAPTER III. 



Distribution of the Mollusca in Time. — Geological 

 Table ; distribution of Species in the Strata ; of Genera ; 

 table of Characteristic genera ; table shewing range of 

 genera ; range of families ; numerical development in 

 time. — Order of appearance of groups of shells ; order 

 of succession. — Migration of species and diffusion of 

 Geneva in former times. — Method of Geological inves- 

 tigation. — Tertiary Age. — Secondary Age. — Palaeozoic 

 Age 408 



CHAPTER IV, 

 On Collecting shells. — Land-shells ; elevation on 

 mountains. — Fresh- water shells. — Sea-shells, litoral spe- 

 cies ; floating mollusca : the towing-net ; trawling ; 

 kettle nets ; deep-sea fishery ; trapping whelks ; dredging 423 



Dredging papers, by M' Andrew and Barrett, Norway 431 



Dredging papers, by Forbes, ^gean 436 



Zones of depth : litoral ; laminarian ; coralline ; deep-sea 



coral zone 439 



Preservation of Molluscous animals for examination 441 



Aquaria 442 



