Mr. G. M. STOCKLEY, F.G.S. in 1925 made the interesting discovery of fossils near the top of Blue Mountain Peak, the highest summit in Jamaica, at the considerable altitude of about 7,000 feet. Unfortunately the material he collected was lost on the way down by a horse slipping and throwing his fossils down a ravine. He told me, however, that he was almost sure there was a species of Inoceramus among them. Dr. C. A. Matley, F.G.S. collected some specimens at the same locality a year or two later. On looking over his collection, however, I could not find any fossils which might fix beyond doubt the age of the beds. During a recent visit to Blue Mountain Peak I was able to spend enough time at the locality to make a small collection of fossils which I now endeavour to describe.

The specimen to be described is from part of the McKenny Hughes Collection, preserved in the Sedgwick Museum, and was without any indication of horizon or locality. It is a slab of hard, light-grey, spotted shale, containing numerous examples of Dictyonema flabelliforme (Eichwald). The matrix is quite unlike any Dictyonema Shale known to the writer from extra-British localities, and from the general habit of the graptolites, supported by the lithology of the shale, the specimen is considered to be from some locality in Wales. In the view of Dr. G. L. Elles, who has examined the specimen, it may be part of a collection of D. flabelliforme made by McKenny Hughes from the Portmadoc district. A remarkable feature is shown in the proximal ends of three of the rhabdosomes, where the sicula terminates, not in a nema, but in a little tuft of root-like fibres.

DURING recent years considerable progress has been made in the study of the palaeontology of the Coal-measures. Attention has been directed to the flora, and to the marine and non-marine faunas. Although it is undesirable to attempt a complete revision of the classification of the Coal-measures until further work has been carried out, it may be useful to indicate certain conclusions which appear to be in accord with present knowledge.

The paucity of animal remains in the Coal-measures of Somerset has been recognized for many years. More recently Dr. H. Bolton has described fossils from various horizons in the coalfield, but his records relate chiefly to insects and marine fossils, while non-marine Lamellibranchs appear to be unusually rare at most horizons. A number of species of non-marine Lamellibranchs have been recorded by various authors, but in view of the wide interpretation formerly given to the various species, many of these records cannot be used for zonal purposes.

Lastly a reference must be made to the nu-delta structures which characterize the contact zone between the continent of Eastern Asia and the floor of the Pacific. in the Sakhalin-Yezo-Kuriles system we find, by experiment, that the northern part of the system was pressed towards the continent to a greater extent than the southern part of it. This is a consequence to be naturally expected. In the Kuriles we find a succession of fractures which prove, beyond any doubt, that the region to the west of those lines effected a southerly or south-westerly horizontal shear against the Pacific. Such a movement not being parallel to the continental border, would necessarily arouse a lateral compression between the continent and the ocean base. Now since the southern terminus of the triangular area covered by the system lies against the Inshan zone which behaved as a strengthening rib on the part of the continental mass against lateral pressure, it would be extremely difficult for the southern apex of the triangular area to shift westward. On the other hand the northern part of the area does not encounter such extraordinary resistance. Consequently the whole area suffers a counter-clockwise twisting movement with the result that the nu-delta system was generated. In this way we are able to understand how the Sakhalin-Yezo-Kuriles system was produced through a southward movement of Eastern Asia.