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Eschara disticha. White chalk. a. Natural size. b. Escharina oceani. a. Natural size. b. Part of the same magnified. A branching sponge in a flint, from the white chalk. From the collection of Mr. The general absence of univalve mollusca in the white chalk is very marked. Palatal tooth of Ptychodus decurrens. Lower white chalk. Cestracion Phillippi; recent. Port Jackson.
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