U. Umbilicated shells, 45. Umbo of shells, 11. Unio margaritiferus, 26; pearls of, 28; pearl fisheries of, 29. pictorum, 26. tumidus, 26. Unionidæ, character of the family, 25; genera of, ib. tinct species of, ib. Univalve shells, 44. Utility of classification, 7. ; ex- V. VALVATA CRISTATA, 59; gills of, 60. piscinalis, 58; lingual ribbon of, ib. Valves, 10. Varieties of species, 6. Velletia, 205. lacustris, 208. Ventral region, 10. Vertebrate animals, 2. Vertigo, characters of, synoptical list of species of, 158. alpestris, 161. antivertigo, 161. angustior, 163. edentula, 159. minutissima, 159. Moulinsiana, 162. palustris, 161. pusilla, 163. pygmæa, 160. substriata, 162. Vitrina, characters of the genus, 100. pellucida, 100; voracity of, 101. W. WATER SNAILS, characters of, 181; habits and reproduction Water-breathing snails, 44. Whorl snails, 158. Z. ZEBRA MUSSEL, description of, 20; foot, byssus, and apertures Zua lubrica, 151; distinction of from Zua lubricoidea, ib. THE END. COX AND WYMAN, PRINTERS, GREAT QUEEN STREET, W.C. In Monthly parts, at 58. To be completed in about 66 parts. Sowerby's English Botany: Containing a Description and Life-Size Drawing of every British The Distinctive Characteristics of this edition are, 1. A life-size drawing of every British plant, arranged according to the Natural System of De Candolle. 2. Where necessary, the plates are accompanied by illustrations of the structure of the various organs of the plant, especially of those structures discovered within the last few years by the use of the microscope. 3. All the illustrations are full-coloured, instead of half-coloured, and the utmost care is taken to adhere as closely as possible to nature. "Under the editorship of T. 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