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Duncan has shown to what extent the Neozoic forms penetrate downward into the Carboniferous and Devonian rocks. Lithostrotion basaltiforme, Phil. sp. England, Ireland, Russia, Iowa, and westward of the Mississippi, United States. Lonsdaleia floriformis, Martin, sp., M. Edwards. Young specimen, with buds or corallites on the disk, illustrating calicular gemmation. b.
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