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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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