In the Geological Magazine, Vol. II. 1865, p. 401, some account was given of the curious gastric teeth of Ceratiocaris and Dithyrocaris, from the Upper-Ludlow and Carboniferous strata of Scotland and Ireland; and in the ArticleCrustacea, by the same author, in the “Encyclopasdia Britannica,” vol. vi. 1877, p. 639, fig. 13, the relationship of such internal masticatory organs to the stomach of the Crab and Lobster, in particular, was treated in detail.

In their great work upon the Palæozoic Corals (Polypiers Foss. des Terr. Pal. p. 252, pl. 17, figs. 3, 3a, 1851) Milne Edwards and Haime describe and figure, under the name of Michelinia geometrica, a remarkable little Coral from the Devonian rocks of France. By the kindness of Dr. Daniel Œhlert, of Laval, whose researches upon the stratigraphy and palasontology of the French Devonian rocks are well known, I have been enabled to examine some well-preserved examples of this interesting form, and have determined some new facts as to its internal structure. Investigation by means of thin sections has, in fact, shown that this Coral has in reality no close relationships with the genus Michelinia, but that its affinities are rather with Protarcea, E. & H. It differs, however, in important structural features from Protnræa, and appears to form the type of a new genus to which the name Cleistopora may be given.

Mr. Adolph Hoffmann has kindly sent me a large series of fossil plants from the Tertiary strata of Leoben containing a very rich fossil flora. On examining the latter, I discovered a fossil leaf, which I at once recognized as a Cycad.

Remains of that family of plants are extraordinarily rare in the Tertiary strata of Europe. They are limited almost entirely to the Eocene formation. The occurrence, therefore, of such a fossil in the Tertiary flora of Leoben, which belongs to the Miocene period, calls forth the greatest interest, and I shall not fail to give a preliminary notice on the subject to palaeontologists.

The Memoir of the Geological Survey on “The Geology of Part of East Lincolnshire,” by A. J. Jukes-Browne, lately reviewed in the GeologicalMagazine, proves so interesting that I am tempted to compare the classification of the Glacial deposits which he has adopted with that I have proposed for the Midland Counties. There are also some features in the distribution and lithological characters of the Boulder Clays to which I should like to draw attention.

The following important and interesting notes on avalanches and the dangerous wind-blasts they cause, appeared in the Pall Mall Gazette for February 28th, 1888. As we do not remember to have seen the geological effects of these phenomena described in any detail in our numerous geological text-books, we believe Mr. Symonds' notes on the subject will be of much interest to readers of the GeologicalMagazine.