The discussion by Professor Gregory in the February GeologicalMagazine of certain ridges of glacial deposits in various widely separated areas seems to call for some comment. I am not familiar with all the examples classified by Professor Gregory any more than he is, but a couple of examples visited by him, and that I have examined many times, may serve as tests of his trustworthiness as a field observer in Glacial Geology and his competence as a commentator upon the observations of others.

The genus Cheirurus offers an interesting study in evolution. Barrande, in his monumental work on the Silurian System of Bohemia, drew up a classification of the genus based principally on the character of the pleural grooves. Thus he divided the species into two sections—

Being prevented by other work from continuing at present my work on the Danian (Laramie) Dinosaurs of Transylvania, I wish briefly to draw attention to the fact that the Upper Cretaceous Titanosaurus, as known from the Montagne Noire in France and from the Cretaceous formation of Argentina, and perhaps also from East Africa (as already pointed out by Fraas), has nothing to do with the Sauropoda, but belongs to the Trachodontid Orthopods, as proved by the abundant Transylvanian material at my disposal.

Zonal arrangements in ancient ignimbrites have usually been interpreted as a reflection of variations in welding. Detailed study of two Lower Palaeozoic ignimbrites from Newfoundland demonstrates that crystallization zones can also be recognized and that in some cases it is these zones which are responsible for the gross features of the cooling unit.

The valuable paper by Professor Harkness on the Middle Drift deposits of Great Britain does not include a notice of their occurrence in Cheshire. About six years ago, a paper of mine on this subject was published in the Reports of the Geological Society of Manchester. I revert to it again, inasmuch as the only locality little dwelt on by Professor Harkness bears out so thoroughly the chief peculiarity about the beds in question.

New stratigraphic data for the Ordovician ectoproct Diplotrypa cf. D. westoni in the Shan Plateau region of Central Burma indicates correlation with the Trentonian of New York State.

In 1908 Dr. Rowe published an account of the Chalk of the Isle of Wight with a zonal map in which the zone of Belemnitella mucronata was shown as entirely absent at some points but generally present in substantial thickness. At the two ends of the island actual measurements were made, of 150 feet at Culver Down and 475 feet at the Needles. How much of the latter thickness was measured in the cliffs and how much is made up of somewhat less satisfactory measurements at low tide on weed-covered reefs is not clear, but at any rate there must be well over 300 feet in the cliffs. This figure is sufficient to show how great a ravining of the pre-Tertiary surface of the chalk would be required for the repeated disappearances of the zone as mapped. It seems justifiable to pay some critical attention to the evidence on which such a state of things is alleged.

Although British and American forms of this genus all bear points of resemblance to Temnocheilus ventro-concavus, only two small specimens from Eastern Europe, Nautilus dorso-armatus Abich, resemble it in their possession of a flattened concave venter and a whorl section of quasi-quadrilateral shape.

In the months of May, June, and October, 1855, and again in July, 1856, Stromboli was visited by M. C. Ste.-Claire Deville. He fully confirms the great variations in the intensity of the explosions of the volcano.

Last year, while on an excursion to Scotland, I visited the Ardnamurchan peninsula, which, as is well known, consists to a great extent of rocks belonging to the gabbro family. On the road leading from the little village of Kilhoan, opposite the Isle of Mull, on the north coast, a small quarry has been opened for road-metal, which shows an exquisite section of a granophyre dyke intrusive in a dark and almost black fine-grained rock, which the microscopic examination proved to be a gabbro. This is, therefore, a similar occurrence to that of Barnavave, Carlingford, Ireland, which has been admirably described by Professor Sollas, and also that of Strath in the Isle of Skye, of which Mr. Harker has given us a detailed account. As occurrences of this kind seem to be rather rare and, as far as I am aware, hitherto not known from Ardnamurchan, I may be excused for calling your attention to the following short description of these rocks, although there is but little to be added to the results attained by the skilful researches of the above-mentioned authors, and it only shows again that on Ardnamurchan we are to expect very nearly the same geological phenomena as in the adjacent islands, in particular in Skye and Rum.

On the 24th of June, 1885, a paper by me, entitled “Observations on some imperfectly known Madreporaria from the Cretaceous Formation of England,” was read at a meeting of the Geological Society which, encountering an adverse report from the referee, was with the consent of the Council, withdrawn by me, and published verbatim in the Geological Magazine of the same year (Dec. III, Vol. II, pp. 541–563, PI. XIV), 1885. The present communication is a continuation as well as a correction of the former one, which has become necessary from the acquisition of additional material.

The subject of denudation is so important that I propose giving a few instances of denudation and of the transport of material that have actually come under my own observation or that of my friends. Where one sees the same familiar crags and pinnacles year after year, apparently quite unchanged, one may perchance fancy that denudation is at a standstill; but anyone who, in scrambling across the screes that clothe many a steep hillside, finds them moving beneath his feet, or perhaps has clattering about his ears a shower of stones dislodged by some wandering sheep, will at once perceive that it is not so: for it is obvious that if the mere tread of such a small beast as a sheep, shepherd or other pedestrian, can set scree rolling downhill, it must be in a very unstable state, and may be expected to move in a conspicuous manner under more potent forces than the tread of animals. Observation shows that this is the case. Not a year passes without some conspicuous fall of scree or of solid rock, owing chiefly to great downpours of rain. Leaving general statements, I will now give actual instances of the fall of rock or movement of scree that have recently taken place in the Snowdon district.

I am indebted to Mr. C. S. Middlemiss, Superintendent of the Geological Survey of India, for a copy of his Memoir on the Geology of Hazara and the Black Mountain recently published. Mr. Middlemiss has embodied in his Memoir the results of an unfinished survey by Mr. A. B. Wynne, late of the Geological Survey of India, and by linking these with his own more recent work, has given us an interesting and valuable Memoir on the Geology of the Himalayan district of Hazara.