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In Part IX. of this series of memoirs (Phil. Trans., Part II., 1878, pp. 319-322) I described, under the generic name ofAstromyelon , a series of stems, transverse sections of which might readily be, and for some time were, mistaken for sections of Calamites; hut I pointed out the differences which separate widely these two types of stem. Attention was directed to the almost universally decorticated condition in which theAstromyelons were found; the only exceptions being one or two examples (loc .cit . Plate 19, fig. 7,d ), in which the vascular zone was surrounded by a thin cellular layer. At the recent meeting of the British Association at York, Mr. Cash , of Halifax, and Mr. Hick, of Harrogate, described a remarkable stem, discovered by Mr. Binns in the Halifax beds, and to which they gave the name ofMyriophylloides Williamsonis .* I shortly afterwards suggested the desirableness of substituting the generic name ofHelophyton as preferable to that ofMyriophylloides , for reasons given in the note in which this suggestion was made.†

XI. On the organization of the fossil Plants of the coal-measures.—Part XII