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Inferior or attached valve. Pecten Beaveri, Sowerby. Reduced to one-third diameter. Lower white chalk and chalk marl. Lima spinosa, Sowerby. Syn. Spondylus spinosus. Ostrea vesicularis. Syn. Gryphaea convexa. Inoceramus Lamarckii. Syn. Catillus Lamarckii. Radiolites Mortoni. Mantell. Houghton, Sussex. White chalk. Diameter one-seventh natural size. The upper or opercular valve is wanting.
Or, in the absence of these long-extinct forms, has a single spiral univalve, or species of Cretaceous Gasteropod, been found living? Or, to descend still lower in the scale, has some characteristic Cretaceous genus of Lamellibranchiate Bivalve, such as the Inoceramus, or Hippurite, foreign to the Tertiary seas, been proved to have survived down to our time?
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