Most geologists are aware that the Chalk of Antrim, although full of flints and fossils like those in the English Chalk, is a hard splintery limestone, known here as the “White Limestone.” Its induration is often attributed to the action of the basaltic covering which spreads over it, and the coincidence of the two things is certainly remarkable; but I think I can now show that they are not connected in the way of cause and effect.

In the Geological Magazine, 1864, Vol. I. p. 150, and 1865, Vol. II. p. 529, two papers of mine appeared upon the strata at Ely. In them, as briefly as might be, are given the sequence of the beds from the Chalk to the Kimmeridge-clay, and the relations of these beds to the Boulder-clay and Kimmeridge-clay on the other side of the pit, where, on all hands, it is allowed to be in situ.

In a former number of Geological Magazine I attempted to describe the old sea-beach which extends along the coast of Llandrillo Bay, and continues round the Great Orme's Head mountain. It is my purpose now to draw attention to the series of Drift-beds, belonging to both the Post Pliocene and recent periods, which are here so well defined within a short space, and it is the more desirable to do so, because the encroachments of the sea are annually producing great changes in this district.

The genus Pseudoglyphea was established in 1860 by the late Dr. Albert Oppel, of Munich, for certain remains of Crustacea occurring in the Oolite and Lias formations of Bavaria, &c., previously referred to the genus Glyphea, from which, however, he has separated them on account of the difference in the direction of the furrows which mark the regions of the cephalothorax. Whether these characters will be found to be supported by others, or, to be in themselves of sufficient importance to justify the retention of the genus, must be determined by more ample materials and a better acquaintance with the entire animals belonging to both genera than we are at present able to command.

The occurrence of invertebrate animal-remains in the Somersetshire Coal-field has not, I believe, been very frequently noticed. With the view of drawing attention to the subject, I send a brief notice of a few remains which I had the pleasure of collecting during a visit with Mr. J. Prestwich to this district, hoping that the local geologists, or members of the Natural History Societies, may be induced to record the observations they have made, or further prosecute enquiries into the occurrence of the animal-remains, either vertebrate or invertebrate, which may be associated with the rich and interesting flora of this Coal-field. Casts of bivalve mollusca (Anthracoptera?) were detected in the coal-shale at Twerton, near Bath, but I was not fortunate in finding any similar shales at the other coal-pits visited. Remains of Entomostraca were, however, tolerably abundant at one or two localities, and I have little doubt would yield a rich harvest to any local investigator.