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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.
Vegetation in those parts is in general but a fifth more speedy than in Europe, even taking as an example the Platanus occidentalis, the tulip tree, and the Cupressus disticha, which reach from nine to fifteen feet in diameter.
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