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Pleurotomaria granulata, Sowerby. Ferruginous Oolite, Normandy. Pleurotomaria ornata, Sowerby Sp. Ammonites Humphresianus, Sowerby. Ammonites Braikenridgii, Sowerby. Oolite, Scarborough. Ostrea Marshii. One-half natural size. The extinct genus Pleurotomaria is also a form very common in this division as well as in the Oolitic system generally.
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