In January last we referred to the celebrations in honour of this important event.1 We have now the pleasure to call attention to the “History of the Geological Society of London,”2 a work which has been written by Mr. Horace B. Woodward, F.K.S., F.G.S., in commemoration of the Centenary. Mr. Woodward has had the help of Mr. H. W. Monckton, Treasurer, who has described the Medals of the Society, Mr. E. S. Herries, M.A., V.P., who supplies a correct version of the Charter, and Professor E. J. Garwood, M.A., Secretary, who undertook to deal with illustrations. Sir A. Geikie, K.C.B., President, Professor Watts, F.K.S., Secretary, Professor Bonney, F.R.S., and Dr. H. Woodward have assisted by reading the proofs, but they are “not responsible for any individual statements” except where expressly acknowledged. These and other persons are duly thanked for the help afforded.

The result of Mr. Woodward' laborious researches has been the production of a book of the greatest possible interest, and one which should be read, not merely by the Fellows of the Geological Society, but by all geologists interested in the history of their science. It is a record of first-class importance, and is, on the whole, a fair and accurate account of the events which have occurred in theGeological Society up to 1860, for the later years are perhaps too fresh in the memories of many to allow of that pleasing view obtained by distance.

Opening with a rapid sketch of the histories of academies and learned societies before 1800 and a note on early geological researches in England, the author refers to the Askesian Society, which, founded in 1796, became the parent of the British Mineralogical Society in 1799.

The present note relates to two specimens. One was obtained by Mr. G. E. Dibley, F.G.S., from the Micrazter cor-anguinum zone of the Chalk at Gravesend, and now forms part of the British Museum collection (register number C. 10576); the other is in the collection of Dr. H. P. Blackmore, F.G.S., of Salisbury (to whom I am indebted for the loan of the fossil), and was obtained from West Harnham, near Salisbury, at the base of the zone of Actinocamax quadratus. Being the more nearly perfect, the Salisbuiy specimen is described first.

It is rarely the ease that we find complete individuals of any species of Lichas, especially in the Ordovician rocks, but several entire specimens belonging to a new British species have been recently collected by Mr. V. II. Turnbull from the Dufton Shales near Melmerby, and detached head shields, pygidia, and hypostomes from the same locality and horizon are not uncommon. Since most species of Lichas have been founded on detached and isolated portions of the body, it is desirable to give a somewhat full description of this new form, which belongs to a group of the genus not previously recognised with certainty in the British Isles.

Pygocephalus Cooperi was first described by Professor Huxley from the Coal-measures of Paisley in 1857 (Quart. Journ. Geol. Soe., vol. xiii, pp. 363–369, pi. xiii), and a second specimen by the same author in 1862 (op. cit., vol. xviii, pp. 420–422, text-figure). Some additional specimens came into my hands for exami-nation, and were communicated to the Glasgow Geological Society, in 1866 (Trans. Geol. Soc. Glasgow, vol. ii, pp. 234–247, pi. iii, figs. 1–3). In that paper I described a second species, which I named Pygocephalus Huxleyi (text-figure, p. 244, op. cit.). The specimens referred to above were obtained from the Coal-measures of Paisley, from Kilmaurs, and from near ilanchester. Since then the late Mr. Henry Johnson, F.G.S., formerly of Dudley, obtained

many examples of Pi/gocephalus from the Clay-ironstone nodules of Coal-measure age at Coseley, near Dudley, now in the Geological Department of the British Museum (Natural History Branch), Cromwell Itond, S.VV. These specimens are preserved in great perfection, and I had fully intended to figure them some years ago, but the pressure of other work caused them to be set aside for a time. Last year I received an example of Pygocephalm from Mr. Walter Baldwin, P.G.S., obtained from the Clay-ironstone of the Middle Coal-measures at Sparth. Rochdale (for description see Fig. 1, p. 405). I have also received through Mr. H. A. Allen, F.G.S., of the Geological Survey Museum, Jermyn Street, by the kindness of their owner, Mr. Herbert Hughes, Assoc. E.S.M., F.G.S., of Horseley House, Volverhampton Street, Dudley, four most interesting specimens of Pygocepkalus collected by him, two of which prove to be females, a point of extreme interest not heretofore observed.

Geologists who are familiar with the Dolomites of South Tyrol will know the transverse sections of Langkofl and Plattkofl Dolomite given by Geh. von Mojsisovics (“Dolomit-Kiffe,” 1879, pp. 191–204). Mojsisovics describes the Schlern Dolomite of Langkofl as resting conformably upon south-dipping Lower Musehelkalk and Werfen strata, and concludes that the Schlern Dolomite here represents a dolomitic facies of all the Mid-Triassic geological horizons—viz., the Mendola, Buchenstein, Wengen and Cassian horizons. The Lower Musehelkalk and Werfen strata then bend northward with a steep flexure and, according to Mojsisovics, conformably underlie the same Mid-Triassic series of Mendola, Buchenstein, Wengen, and Cassian horizons, but the Buchenstein horizon is here present in the nodular limestone facies, and the Wengen and Cassian horizons in their tufaceous facies.