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Hippopodium ponderosum, Sowerby. 1/4 diameter. Leptaena Moorei, Davidson. No less than eight or nine species of Spiriferina are enumerated by Mr. Davidson as belonging to the Lias. Palliobranchiate mollusca predominate greatly in strata older than the Trias; but, so far as we yet know, they did not survive the Liassic epoch. Ammonites Bucklandi, Sowerby. Ammonites bisulcatus, Brug.
One- eighth diameter of original. a. Side view. b. Front view, showing mouth and bisulcated keel. Ammonites planorbis, Sowerby. One-half diameter of original. Nautilus truncatus, Sowerby. Ammonites bifrons, Brug. Ammonites Walcotti, Sowerby. Ammonites margaritatus, Montf. Syn. Ammonites Stokesi, Sowerby.
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