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The animal of the recent Turritella communis partitions off in like manner as it advances in age a part of its spire, forming a shelly septum. Bellerophon costatus, Sowerby. The genus is not met with in strata of later date.
The Lower White Chalk, which is several hundred feet thick, without flints, has yielded 25 species of Ammonites, of which half are peculiar to it. The genera Baculite, Hamite, Scaphite, Turrilite, Nautilus, Belemnite, and Belemnitella, are also represented. Ammonites Rhotomagensis. Chalk marl. Turrilites costatus, Lam. Lower chalk and chalk marl. a. Scaphites aequalis.
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