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This latter group constitutes the larger part of the Carboniferous Mollusca, 157 species being known in Great Britain alone, and it will be found to increase in importance in the fauna of the primary rocks the lower we descend in the series. Terebratula hastata, Sowerby, with radiating bands of colour. Mountain Limestone. Aviculopecten sublobatus, Phill. Mountain Limestone.
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