The collection of fossils belonging to the Geological Survey of Egypt which has been sent to England for description by Capt. H. G. Lyons, E.E., contains a series of forty specimens of corals, including representatives of nine genera and eleven species.

This note deals with a very simple matter, which is perhaps J_ familiar to many workers with the microscope. I believe, however, that it is not referred to in ordinary text-books, and a word or two in reference to it may be useful.

When reading through descriptions of hand-specimens of igneous rocks I have often found a difficulty in forming an exact mental picture of the appearance of the rocks because of the very meagre information usually given as to the coarseness or fineness of their texture. The following simple method would, I believe, to a great extent obviate the difficulty now experienced in giving such information.

Let us next turn to the postulated subglacial rivers. How can we conceive of tunnels of ice 100 miles long runninginone direction, 300 feet high, and only 20 or 30 paces wide? The difficulty about the provenance of the stones, again, is equally great or even greater, and more insurmountable in such a case than it would be in the case already cited.

In rearranging the Carboniferous fossils in the Woodwardian Museum, I met with a specimen labelled Aihyris, n.sp., which reminded me of the form described by De Koninck as Terebratula serpentina. On careful examination I am convinced that it belongs to this species, and the following is a description of our specimen:— Shell subovate, terebratuliform, widest at about one-third its length from its anterior edge. Valves moderately convex, slightly flattened anteriorly, and devoid of sinus and fold; margin entire and regular. Ventral valve a little less deep than dorsal valve, and furnished with a slightly recurved beak truncated by a large circular foramen, bordered in front by a pair of deltidial plates. Surface of both valves ornamented with straight, radiating, very faint ribs, 60 to 70 in number, arranged in a regular close series separated by weak narrow furrows. Some of the ribs bifurcate at about half their length, and those near the hinge-line curve gently backwards. Shell substance finely punctate. Concentric strife of growth are distinct on both valves. Length, 25 mm.; breadth, 22 mm.; dorsiventral diameter, 12 mm.

About five-and-twenty years ago a large boulder, lying in the garden of Wimpole Hall, near Koyston, was pointed out to the Rev. Osmond Fisher by the Lady Hardwicke of that period, and s-he informed him that it had been brought from near Old North Eoad Station when the hill there was lowered. As its dimensions and nature had not been determined, Mr. Fisher invited me to accompany him to Wimpole on April 22nd in order to examine it, having previously obtained permission from the present owner of the property, Lord Eobartes. After a brief search the boulder was discovered lying about 30 yards north-west of the conservatory and almost concealed under a dense growth of ivy. It measures approximately 8 ft. 10 in.inlength, 4 tt.inheight, and lft. 8 in.inbreadth, and consists of a greenish-grey tough sandstone. Mr. Fisher determined its S.G. to be 191 and its weight to amount to 3 tons 2cwt. Lithologically the rock is precisely similar to portions of the Spilsby Sandstone of Lincolnshire, and a specimen in the Woodwardian Museum from near Claxby is indistinguishable from it. By good luck a small Ammonite occurred in a fragment chipped off by the Kev. E. Conybeare, who met us at Wimpole; and Mr. G. C. Crick, of the British Museum, who has kindly examined it for us, writes that it ia “ not referable to any species which has hitherto been recorded from Great Britain, “but that it” is closely related to Olcosteyhanus (Craspedites) subdilus (Trautschold), which has been recorded from the Spilsby Sandstone of Lincolnshire (Pavlow and Lam pi ugh, ‘Argiles de Speetpn,’ etc., p. 116, pi. xiii (vi), figs. 5a, b, c).“