The occurence of certain of the Lower Silurian Rocks of the Lake-district beneath the Scar Limestone of Yorkshire, on a line between Ingleton and Settle, has been long known, and has been noticed both by Professor Phillips (Trans. Geol. Soc. 2nd series, vol. iii. p.1), and by Professor Sedgwick (Quart. Journ. Geol. Soc. vol. viii. p. 35). More recently the rocks in question have been shortly descrobed in a paper by Mr. Hughes, of the Geological Survey (Geol. Mag. Vol. IV. p. 346). Having had the opportunity of visiting Ingleton in company with Professor HArkness, and subsequently alone, I have collected the following brief notes of the Silurian strata which are seen in that locality, and which belong to the Green Slates and Porphyroes of the Lake-district.

I Have long thought that the vallies of the Onny and the Teme, both above and below Ludlow, had once formed an estuary, and that the promontory on which the town stands had been thrown up by some convulsion blocking up the valley, and turning tha part above the town into a lake, which (by faults or otherwise) eventually caused an opening for the Teme between the Castle and Whitcliffe.

The object of the accompanying list of Fossil Fishes is merely to record, for future palæontologists, the depository of a few specimens which have furnished the materials for descriptions and figures of species recorded in the publications of the day. They are available for inspection to any one who may be interested in their examination, and I am only too happy when I can induce any geological or palæontological students to come and see them.

Having seen in the September Number of the Geological Magazine (p. 408), the Catalogue of Types of Fossil Fishes in the collection of my valued friend and fellow-worker Sir Philip de Malpas Grey Egerton, Bart,, M.P., with whom I have collected for so long a time, it occurred to me that the addition of the list of the type specimens of genera and species in my own collection would be a useful supplement to Sir Philip Egerton's carefully prepared catalogue, and might not be wholly unacceptable to the student in Palichthyology. I therefore beg to subjoin it, and, in doing so, to reecho the sentiment expressed by my friend, that my collection, like his own, although a private one, is always accessible to the student in Geology or Palæontology who may deem it of sufficient interest to visit Florence Court in order to study it.

The Unconformity between the Green and Skiddaw Slates, which I pointed out in the last number of the Geological Magazine, (see p. 56) as exhibited between Grange in Borrowdale and Dale Head will, I think, explain satisfactorily the Geology of Derwentwater

The little village of Crossby-Garrett, near Brough, appears to occupy the site of a Post-glacial lake. Lower Carboniferous strata compose the fell to the south, the lowest beds being yellow earthy limestones. Below this, in all the gorges, are deep red shales of the uppermost Old Red. and on the summits of some of the hills to the south are outliers of the New Red; the Drift lies in patches and contains mud, sandstone, and numerous blocks of Shap granite. The gullies coming down from Crossby fell converge at the gate of the village, and show excavation in Boulder drift. The bed of the torrent is dry during the greater part of the year, it receives only the surface water, which, as it falls swiftly down the valley through the Drift, makes rough work of its sides every freshet. Underneath the church hill, at the lower end of the village, the remains are visible of the dam which once enlaked the little valley. It has been clean cut through by the bursting of the Lake, and the banks of the exca- vation, and bottom of the old lake are now occupied by cottages and gardens. Another small lake existed near the village, in fields still called the tarn-fields, but whilst the former must have been drained, probably in pre-historic times (judging from the subsequent work of the torrent), the latter has disappeared by artificial drainage into the Smardale beck within a century.

Recent considerations of health having induced me to spend from five to six months on the continent, I beg to submit tothe readers of the Geological Magazine the result of my notesmade during my journey, which may perhaps prove not entirely uninteresting.

The collection of Mr. Baker, at Woodbridge, contains a tooth from the Suffolk Bone-bed, indicating a Mastodon of the section Trilophodon. The tooth appears to be the upper penultimate molar of the left side. Its chief peculiarities are its great breadth, approaching M. (Trilophodon) tapir oides; the shortness of the ridges, the cingulum well marked in parts; the absence of a posterior and presence of an anterior talon. It apparently belongs to Falconer's section, “Colliculi obtusi—valliculasque transversæ.” From a number of measurements and examinations of specimens of M. angustidens in the British Museum, of M. Borsoni and tapiroides in Paris (which I have to thank M. Lartet for very kindly showing to me), and M. Borsoni at Le Puy in the Haute Loire, I consider that this tooth, comes nearest to the corresponding tooth of the huge Pliocene Mastodon Borsoni, though the cingulum and talon (very variable parts of the tooth) are unusually marked in Mr. Baker's specimen.

During the past summer, I had the good fortune to detect Albite (Soda-feldspar) in some blocks of granite in the wall of the west pier at Kingstown, Co. Dublin. As the pier is built of rock from the Dalkey quarries, the mineral can be referred, with tolerable certainty, to its original locality. I was induced to look closely at the above-mentioned blocks, through noticing that they contained a mineral of a purple colour; this proved to be fluor, which occurs sparingly throughout the Leinster granite. Associated with the fluor was a pretty considerable quantity of a white mineral, occurring in aggregations of minute crystals; this appeared to me to be so like Albite that I considered it deserving a careful examination.

Professor Phillips remarks that “from the Inferior Oolite downwards through the Liassic series Belemnites are almost never absent from the section till we reach the zone of Ammonites Busklandi; only in the upper part of this zone have they been found—at Salford and at Lyme Regis,” But as the unique example—the subject of the present communication—was collected from thezone of Ammonites angulatus, it is the oldest known British Belemnite, and as such claims some attention.