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75 referred to. In P. giganteus the corresponding plates of the body, it is true, are hid by spine impressions, hut there is, practically speaking, no room for similarly large structures, and on this ground their absence is conjectured. The oral plates are certainly very large, and quite different from the small node-like hones in P. Stutchburii. In all probability the adamhulacral plates will he found to he smaller than those of the last-named fossil, hut to possess larger and better developed tubercles. In fact, the latter have much the appearance of the primary tubercles of Arcliceocidaris. As regards the extent of the body, P. giganteus is even a larger species than P. Qlarhei, measuring no less than seven inches from the apex of one ray to that of another across the disc. Locality and Horizon.—Ravensfield Quarry, near Parley, Co. Northum berland (Mr. T. Browne) :—Lower Marine Series. Division—PELMATOZOA. Class—CRINOIDEA. Ohs.—The first Writer to chronicle the remains of this Class in the Permo-Carboniferous rocks of New South Wales was Sir P. McCoy, 1 who brought to notice the interesting, and apparently aberrant Tribrachioerinus, Clarkei. Later, the presence of the United States Exploring Expedition, under the orders of Commander Charles Wilkes, U.S.N., afforded Prof. J. D. Dana, Naturalist to the Expedition, the opportunity of examining some portions of the coast districts of New South Wales, resulting in the discovery of some very strange plates, to which he applied the generic name of Bentadia. 2 These will be referred to in detail later on. As the original collection of the late Rev. W. B. Clarke, E.R.S., afforded Prof. McCoy the first introduction to our Permo-Carboniferous Crinoids, so the second, accumulated by the same energetic Geologist, enabled the late Prof. L. G. de Koninck to advance our knowledge 3 by adding to the 1 Ann. Mag. Nat. Hist., 1847, XX, p. 228. 2 Wilkes’ U. S. Explor. Exped., 1849, X (Geology), p. 712. 3 Foss. Pal. Nouv.-Galles du Sud, Pt. 3, 1877, PP- 158-166.