Abstract

On two occasions the author directed attention, in the Proceedings of the Royal Society (vol. xx. pp. 95 & 435), to the structure of some stems which appeared to him to belong to the well-known genus Asterophyllites , briefly pointing out at the same time their apparent relations to a strobilus of which he had previously published figures and description (Transactions of the Literary and Philosophical Society of Manchester, third series, vol. v. 1871) under the name of Volkmannia Dawsoni . In the present memoir he gives a detailed exposition of the various parts of the plant, including the roots, rootlets, stems, branches, leaves, and fruit, in different stages of their development. This is done chiefly in two modifications of the primary type—one from the Lower Coal-measures Oldham in Lancashire, the other from those of Burntisland.

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