The Jurassic deposits of Western North America contain the remains of many gigantic Dinosaurs, and various skeletons of these have been obtained by the writer, who has described the more important forms. Restorations of the skeletons of three of the most interesting genera, Brontosaurus, Stegosaurus, and Ceratosaurus, have already been given in the American Journal of Science and in this Magazine, and another of these huge reptiles is thus represented on Plate VI.

“ It presents itself sometimes in the form of small rounded masses, or irregular nodules; or at other times as lobate or ramified masses of considerable dimensions. Viewed with a powerful magnifying-glass, it appears to be quite compact or obscurely fibrous” (Nicholson).

The internal structure is commonly much obscured, or even destroyed by crystallization.invertical section the cells are arranged in radiating fashion.

Having been honoured by an invitation to state to your Society the physical principles upon which my Theory of the Origin of Mountain Ranges is founded, I do so with the greater pleasure knowing that it will receive a searching criticism at your hands, from which I hope to derive considerable benefit. My audience hitherto having been mostly geological, the physical principles involved have been to some extent subordinated to geological conditions.

The occurrence of a fish generically identical with Eurycormus of the Bavarian Lithographic stone, in the Upper Jurassic of England, has already been indicated by the discovery of a well-preserved head with some anterior vertebras in the Kimmeridge Clay of Ely. Only one specimen, however, has hitherto been recognized; and during a recent search for further evidence of the fish among British fossils the present writer has thus been gratified to find two more examples in the collection of the British Museum.

I am much obliged to General McMahon for criticising my recent paper in the Geological Magazine (Dec. 1893, p. 535) on the “ Conversion of Chlorite into Biotite,” because I have been puzzled to know the exact nature of the opposition to my views on rock-inetarnorphism at Malvern, and I have been haunted by the fear that perhaps after all I might have overlooked something fundamental. Happily my curiosity is now gratified, and my fear is removed, so far as one important branch of the enquiry is concerned. As my critic is so good a chemist, I may conclude that the worst has been said that can be said from the chemical point of view.

While examining the dykes along the coast of Mourne in the company of Mr. R. Welch, I came across an additional example of intrusive variolite, the occurrence of which seems worth recording. The mass is,inthis case, a thin one, about 20 centimetresinwidth, narrowing and dying out as it is traced northwards; it runs in a somewhat sinuous course along the strike of the uptilted strata. Every other dyke that I have seen upon this richly favoured coast cuts across the Ordovician beds, and the present instance to the contrary may be only a lateral sheet-like offshoot from one of the familiar basalts.

For some time I have had under observation the sections of drift exposed in the cuttings of the Seacombe branch of the Wirral Railway, and hope to describe them on some future occasion when the sections are nearer completion.

However, Mr. Mellard Keade has forestalled me in the description of one part of the sections, and professes to have foundinthem evidence of “ an ancient glacial shore.” What does he produce in favour of the statement?

Having heard from my esteemed friend and colleague, Mr. J. W. Wetherell, that some years ago a brown crystalline substance had been found in a cave close to the sea, and situate between Porthcurnow and Porthchapel, I was impelled to make a search for the mineral. Last July I succeeded in finding a cave near Porthcurnow, the small opening into which was partially hidden by masses of fallen rock; here I found after a rough examination traces of the mineral for which I was looking.