The object of the present paper is to provide a short account of a group of rocks to which the general name of pyroxenite may be given, inasmuch as they are essentially non-felspathic plutonic rocks, free from olivine, and of igneous origin, and with a nearly colourless monoclinic pyroxene as the chief or only constituent of many of the most conspicuous varieties. The exposures are widely distributed in the Central, Ova, and Sabaragamuwa provinces, and probably throughout Ceylon, but are individually of very small extent. The rocks are composed of the minerals diopside, amphibole, phlogopite (or biotite), scapolite, pyrite, sphene, and sometimes felspar, calcite, and spinel; the dominant mineral is the pale green or grey granular diopside, colourless in thin sections: the rocks are often entirely, or almost entirely, composed of this mineral; next in importance are green amphibole (dark in hand-specimens, but very pale in thin sections), and a pale golden-brown phlogopite, which sometimes forms a large proportion of the rock, and in extreme cases the whole bulk of sills or dykes several feet in thickness.

The city of Nottingham is built upon the outerop of the Trias. Building and road-making operations consequent upon its rapid growth often lead to the laying bare of the underlying Bunter, Keuper Waterstones and Marls. Unfortunately the wort is usually carried on with such rapidity that good exposures are often missed. A temporary cessation of activities in one part of the Sherwood suburb, however, left a beautiful exposure of the Waterstones. A careful examination of this during the past few months has led to the discovery of footprints and fish-remains. The footprints are of a type which does not seem to fit into the generally used system of classification. In 1857 the Rev. A. Irving found a Cheirotheroid print in the railway cutting at Colwick. This is the only record of the previous discovery of footprints in this district.

I Quite agree with Mr. Goodchild's statement in the July Number of the Geol. Mag. that the stratigraphy of some of the areas in which the Coniston Limestone Series is developed “presents very considerable difficulties,” so much so that in the areas of Cross Fell and Settle portions of the “country might be described as consisting of a gigantic fault-breccia,” and that it is necessary “to go over a large part of this faulted area again and again” in order to interpret its structure. I do not know whether Mr. Goodchild would class me amongst the “less fortunate” ones who have not been over the ground again and again; possibly I have not devoted the amount of time which he has been able to give to the study of the rocks of the Cross Fell Inlier, but it must be remembered that Prof. Nicholson, with whom I had the pleasure of working at this inlier, has returned to the ground again and again during a long course of years, whilst more recently, he and I have devoted several vacations to its study, and we have carefully compared the beds and their fossils with those of adjoining and more distant areas.

In “Faunas Triassicas do Brasil”, by F. R. Cowper Reed (Monogr. Serv. Geol. Brasil, ix, 1929), there occurs on pp. 84, 85, a note by me on an obscure crinoid. This should have been accompanied by an illustration, but the drawing supplied was not reproduced. It has recently been returned to me by Dr. Cowper Reed, who concurs in my suggestion that it should now be published since the occurrence is certainly interesting and is liable to be overlooked among the wealth of lamellibranchs described by him, and beautifully figured on his plates by E. T. Talbot.