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Lingula, most persistent throughout all geological time, is abundant in the coal-shales, but not in the limestones. Aviculopecten is there abundant also. Fenestella retipora. Goniatites. We have evidence of the existence in the forests of a variety of centipede, specimens having been found in the erect stump of a hollow tree, although the fossil is an extremely rare one.
They are familiar to the miner as mussel-binds, and are as noticeable a feature of this long ago period, as are the aggregations of mussels on every coast at the present day. Aviculopecten papyraceus.
Such carbonic acid, meeting with the protoxide of iron in solution, would unite with it and form a carbonate of iron; and this mingling with fine mud, when the excess of carbonic acid was removed, might form beds or nodules of argillaceous ironstone. Natural size and magnified. b. Natural size and magnified. Goniatites Listeri, Martin. Aviculopecten papyraceus, Goldf.
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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