Abstract
THE Geological Magazine for June (No. 84) commences with some notes on Crinoids by Mr. John Rofe, relating rather to the zoological than to the geological aspects of that class of animals. Mr. Rofe describes some experiments made on recent Crinoids by treating them with solution of potash or muriatic acid, from which he arrives at the conclusion that their hard parts are invested by a membrane giving them a certain degree of flexibility, a general position which few naturalists will be inclined to dispute. But the details of structure described by Mr. Rofe will be found of much interest. In his concluding remarks he endeavours to show an approximation between the Crinoids and the Tunicata, which, to say the least of it, is very doubtful.—Mr. S. Allport publishes a note on the microscopic structure and composition of a rock from the “Wolf Rock” off the Land's End, which he identifies with phonolite, and justly protests against the system which gives different names to rocks identical in mineral composition because they happen to be of different geological ages.—Mr. D. Mackintosh describes the drifts of the west and south borders of the Lake district, with especial reference to their great granitic dispersions which he believes have taken place; and Messrs. C. and A. Bell discuss the divisions of the English Crags as indicated by their invertebrate fauna. They propose as the result of their investigations, to divide the Crag into Upper, Middle, and Lower; the Upper including the Norwich, and the upper part of the so-called Red Crag; the Middle, the remainder of the Red Crag; and the Lower, the Coralline Crag. The last paper consists of a comparison of the metamorphic rocks of Scotland and Gal way, by Mr. G. H. Kinahan. The first and last of these papers are illustrated with plates.
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Scientific Serials . Nature 4, 194–195 (1871). https://doi.org/10.1038/004194a0
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DOI: https://doi.org/10.1038/004194a0