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This atlas is the culmination of nearly forty years' work by members of the Conchological Society of Great Britain and Ireland. All 214 species of terrestrial and freshwater molluscs, whether native or introduced species that are naturalised in open habitats in the British Isles, are individually mapped based on 10-km square dot-distribution maps. Each species map is accompanied by notes on its habitat, British status and overseas distribution, and each map also includes a small black and white illustration of the species. Additional maps illustrate environmental factors affecting distribution. The book also contains an extensive bibliography.