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Thurmann has shown how remarkably this fact holds true in the Bernese Jura, although the argillaceous divisions, so conspicuous in England, are feebly represented there, and some entirely wanting. Terebratula digona, Sowerby. Natural size. Purpuroidea nodulata. One-fourth natural size. Cylindrites acutus. Sowb. Syn. Actaeon acutus. Patella rugosa, Sowerby. Nerita costulata, Desh.
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