LONDON Geological Society, May 25.—R. Etheridge, F.R.S., president, in the chair.—Rev. Tom Bullock Hardein, M.A., LL.M., was elected a Fellow of the Society.—The following communications were read:—On the discovery of some remains of plants at the base of the Denbighshire grits, near Corwen, North Wales, by Henry Hicks, M.D., F.G. S.; with an appendix by R. Etheridge, F.R.S., Pres. Geol. Soc. Traces of these fossils were first observed in 1875 by the author in Pen-y-glog quarry, about two miles, east of Corwen. Further research has resulted in the discovery of more satisfactory specimens, which have been examined by Messrs. Carruthers, Etheridge, and E. T. Newton. Among them are spherical bodies resembling the Pachytheca of Sir J. D. Hooker, from the bone-bed of the Ludlow series, supposed to be Lycopodiaceous spore-cases; also numerous minute bodies stated by Mr. Carruthers to be united in threes, and to agree with the forms of the microspores of Lycopodiacex, both recent and fossil; and some fragments, which may belong to these plants, and others, probably belonging to plants described by Dr. Dawson from the Devonian ot Canada under the name of Psilophyton. The above testify to the existence of a very rich land-flora at the time. Mixed up with these however are numerous carbonaceous fragments of a plant described also by Dr. Dawson from the Devonian of Canada, which he referred to the Coniferse, but which is, according to Mr. Carruthers, an anomalous form of Alga. The former called it Prototaxites; the latter renamed it Nematophycus. Numerous microscopical sections, showing the beautiful structure of this interesting plant from the specimens found at Pen-y-glog, have been examined by Mr. Etheridge and Mr. Newton, and their conclusions agree with those of Mr. Carruthers. The evidence seems to show that at this mid-Silurian period the immediate area where the plants are now discovered must have been under water, and that the mixture of marine and dry-land plants took place in consequence of floods on rapid marine denudation. The author indicated that the land-areas must have been to the south and west, chiefly islands, surrounded by a moderately deep sea, in which Graptolites occurred in abundance. The position of these beds may be stated to be about 2000 feet below the true Wenlock series, and about the horizon of the Upper Llandovery rocks.—Notes on a mammalian jaw from the Purbeck beds at Swanage, Dorset, by Edgar Willett. Communicated by the President.