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Murchison and De Verneuil discovered this species dispersed in myriads through a white limestone of Upper Silurian age, on the banks of the Is, on the eastern flank of the Urals in Russia, and a similar species is frequent in Sweden. Lingula Lewisii, J. Sowb. Atrypa reticularis, Linn. Upper valve. b. Lower valve. c.
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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