This monograph first appeared in the "Essex Naturalist" (Volume XIV., 1905-6) and has been republished by special arrangement with the Council of the Essex Field Club. _Lecturer on Biology and Nature Study to the Surrey County Council, Honorary Secretary of the Selborne Society, Sometime, Senior Assistant Lecturer on Biology to the Essex County Council, and Editor of the Journal of Malacology, Joint Author of_ "Eton Nature Study and Observational Lessons."…
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