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The conchologist's textbook Plate VIII . re ns Uniyalve ' LSr cirn dO PixbiislLea vJx FuILartou Glasgcnr Plate VIII Illustration biodiversitylibrary org title Brown Thomas Poe Edgar Allan Roper Clyde Scott Robert Biodiversity Heritage Library The conchologist's textbook Identification Mollusks Shells Smithsonian Institution