The succession in the Upper Dalradian is described. The author follows Anderson in correlating the Leny and Ben Ledi Grits. Way-up evidence indicates that the Leny Limestone does not occupy a syncline as previously supposed, but is a stratigraphical intercalation in the Leny Grits. It is shown from way-up evidence and structural analysis that the Aberfoyle Anticline closes downwards and is a synform.

This note records a unique instance of rhythmic layering which is likely to have an important bearing on the interpretation of such layering in general.

Material belonging to the genus Salterolithus has been examined from Trilobite Dingle, Welshpool, and it is found that S. caractaci and S. intermedius (Wade 1911) are conspecific, the older name taking priority. Trilobite Dingle is the type locality for S. intermedius and also for the restricted species caractaci. A new variety is established for the forms occurring slightly higher in the sequence than S. caractaci.

The north-eastern area of Dartmoor is traversed by a series of straight valleys which follow fault lines. One fault-system, which crosses the granite from near Lustleigh north-westwards to Stickle-path, is described in detail, and its relationships to structures in a wider area are briefly discussed.

The antipathetic relation between chloritoid and biotite in the lower metamorphic grades of the Barrovian zones and the genesis of the index minerals in the higher metamorphic grades are briefly discussed. The observed mineral assemblages of 13 new analyses of peltic schists are compared with the assemblage required by the mineralogical phase rule; good agreement exists provided allowance is made for magnesia acting as a separate component. Six new biotite analyses covering all of the Barrovian zones show an increase in the degree of replacement of Si**** by Al*** with increase in metamorphic grade. The ratio of FeO: MgO varies according to the associated ferromagnesian minerals and shows no regular relation to metamorphic grade.

Goniatite faunas characteristic of the principal Namurian stages are reported in many areas of the U.S.S.R. The faunas are listed, and a brief account of some recent systematic work is given.

The Fuller's Earth Clay of the Whatley district nowhere rests directly on the Palaeozoic rocks, but is always underlain by Inferior Oolite. The Fuller's Earth Rock of the district contains two distinctive and successive faunas, the upper of which bears a suite of ammonites hitherto unknown from rocks of this age. It is correlated with the Wattonensis Beds of the Dorset Fuller's Earth.

A new echinoid species, Eupholidocidaris belli, is described from the Upper Carboniferous of Texas.

Biotile is recognized as the dominant mineral of the arborescent, plumose, and scopulitic growths found in the Arran pitchstones. The chemical composition of the pitchstone group of glasses is briefly discussed in terms of the experimental data on the hydrous granite system.

Accessory structures on the brachial loops of certain brachiopods are considered to be initiated as supplementary calcification, and when persisting to the adult stage, to become part of the loop.

Re-examination of the contact between granophyre and arkose on Minishal, Isle of Rhum, shows it to be a tectonic junction in which the effects of crushing and shearing have been largely obscured by contact alteration.