Having been for the last twelve months engaged in a careful study of the post-Tertiary geology of the eastern part of Shrop-shire, I have at length arrived at the conclusion that the denudation of the New Red Sandstone in this neighbourhood, and consequent excavation of the Tern basin, has been effected partly by glacial and partly by marine agency; the grounds upon which this conclusion is based being:—(1) An attentive consideration of the general form and outline of the basin; (2) A particular examination of the drift beds contained therein.

The announcement of the discovery of a Hyæna-den, near Laugharne, may possibly be of some interest to those of your readers who may be inclined to visit the bone caverns of South Wales during the approaching summer. In the autumn to last year J. R. Allen, Esq., of Albert Terrace, Regent's Park, London, was good enough to send me word that, during a few days' stay at Laugharne, he had discovered some fragments of bones in a limestone cavern known as the “Coygan cave;” adding, at the same time, that it was not known in the district that any one had hitherto found bones there, or that it had ever been explored for that purpose.

Any observations which can throw light on the systematic position of the Graptolitidœ are of great importance. That these anomalous fossils are Zoophytes, in the wide sense of the term, is almost universally conceded; the diffculty is in determining whether they are cœlenterate or molluscoid. Those who have described the members of the family have almost invariably considered them to be hydrozoa, and it must be allowed that in general aspect they very much resemble Plumularia and Sertularia. But when their structure is examined it will be found that they widely differ from any known hydrozoon, and especially in that the entire polypidom is composed of the different polype-cells, without any distinct common canal. Sometimes the polypes rise from a common substance which extends along the whole of the celluliferous portion of the organism, but there is no constriction or septum at the base of the cells, cutting off this common substance from the individual polypes. This is the structure of Graptolitus priodon, Bronn. In other species the walls of each cell seem to be continued to the solid axis, as is the case most probably in Graptolitus sagittarius, L. and certainly in some the species with a double series of cells, as Diplograpsus folium, His. D. pristis, His. and D. cometa, Gein. The mouths of the cells are frequently furnished with one or more long spines, as in some species of Bastrites, and in Diplograpsus pristis, His. In these characters the graptolites show a greater affinity with the polyzoa. Compare the genera Scruparia and Bicellaria. But there are some peculiarities which do not well agree with the living forms of either section zoophytes. Among these may be mentioned first the prolongation of the solid axis in both the unilateral and bilateral forms beyond the celluliferous portion in the newer part of the polypidom, and then their free polypidoms, for neither the spines which terminate the older portion of some species of Diplograpsus nor the slender base of Dendrograptus linearis, Car., could be radicles, and the species of the genus Graptolitus have no indications of a hydrorhiza from the older extremity.

The principal object of a paper which I read at the British Association was to point out the connection between an ancient river running on the Continent, in the direction of the Rhine, and the estuarine deposit of the Forest bed, on the eastern coast of this country. Many geologists have maintained that such a river ran from south to north, which would be in the direction of the Straits of Dover. In proof of the correctness of this supposition, I mentioned that numerous vertebræ of whales had been found in the estuary, which indicated an opening to the sea, and also arctic shells, which indicated a northerly direction; at the same time that the immigration of elephants and other animals proved the junction of this country with the Continent.

On the evening before I left Cambridge last term, I was informed by a man who brings me fossils, that some new coprolite diggings had been opened in the Fens. I was unfortunately unable to visit the workings then, but since my return to Cambridge, I have explored them in company with Mr. Moore, of St.Catherine's College. The workings are situate about a mile from Upware, which lies about twelve miles from Cambridge, and seven from Ely.