Transcriber's Note: Italic text is denoted by _underscores_ and bold text by =equal signs=. THE BRITISH WOODLICE. 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. THE BRITISH WOODLICE. BEING A MONOGRAPH OF THE TERRESTRIAL ISOPOD CRUSTACEA OCCURRING IN THE BRITISH ISLANDS. BY WILFRED MARK WEBB, F.L.S., _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." AND CHARLES SILLEM. WITH TWENTY-FIVE PLATES AND FIFTY-NINE FIGURES IN THE TEXT. LONDON: DUCKWORTH & CO., 3, HENRIETTA STREET, COVENT GARDEN. 1906. PREFACE. In Professor Sars' "Crustacea of Norway," quite a number of the British species of woodlice are figured in detail and described in English, but few copies of this fine work are to be met with in our country. The Rev. Canon Norman has from time to time published notes on the British species in "The Annals and Magazine of Natural History;" these are, however, scattered, and contain but few figures, while other literature that exists is out of date. Under these circumstances, we have thought that the following account and figures of all the British species would be useful to those anxious to work at the woodlice, and might also encourage others to pay attention to the distribution and habits of the interesting tribe to which they belong. The writers would welcome any corrections or additions in view of a second edition. W.M.W. C.S. ODSTOCK, HANWELL, _December, 1905_. CONTENTS. PAGE