The Land and Freshwater Shells of the British Isles

angulated animal apex obtuse B.C. Near Birmingham base beaks Birmingham bivalve body whorl occupying Bookseller at Home Britain brown brownish bulbs Church Stretton close-set colour compressed Conchology conical convex crawling Crown 8vo curved cylindrical dark Demy 8vo denticle dextral diverging Edition eggs elongated epidermis thin epiphragm fold foot genus globular glossy grey greyish Gwyn Jeffreys Helix Illustrations India indistinct inner lip keeled Lamaism last species line of growth lingual ribbon LINNÉ lower pair mantle molluscs moss MÜLLER narrow nearly oblique oblong operculum orifice outer lip outer lip thin oval ovoviviparous pale penultimate whorl periphery rounded peristome placed Planorbis posterior side Pupa rounded in front semitransparent shagreened shell Sherriff Tye slaty-grey slender smaller specimens spiral spire stones striæ striate suture suture deep suture deepish Swansea swollen tail teeth Tenby tentacles thick thickish tinged transparent transverse truncate tubercles umbilicus univalve upper pair usually valve whitish