In parts of Rosedale and Farndale the Serpula Beds are exactly as in Fryup and Danby; they consist of very fine-grained sandstones or silts, blue, grey, green, yellow, or brown in colour, according to the degree of oxidation, and always full of worm tubes. In many specimens it is clear that practically the whole of the material has been passed through the bodies of worms, leading to a very confused structure. The worm tubes may be several inches long: they are only occasionally vertical or straight, but usually arranged in an irregular manner. Fossils, usually broken and badly preserved, are sporadic, but deter-minable ammonites of the striatulum and dispansum zones have been recorded in different parts of the area (Macmillan, 1932, and this paper).

It has recently been reaffirmed, on the basis of evidence derived from published maps, that in the Moine schists the south-easterly plunging lineation appears to increase in intensity as the Moine thrust area is approached. This statement is not in accordance with facts observable in the field and is a false premise on which to base the conclusion that thrusting and lineation are related. A further fact of vital significance in relation to such a conclusion is the widespread development of a similar lineation, plunging south-easterly and likewise expressive of a girdle fabric, in unmoved Lewisian rocks of the foreland.

Uraninite and monazite collected by Dr. H. Crookshank from pegmatites occurring respectively at Bisundni and Soniana (Rajputana) have been analysed for U, Th, and Pb by Mr. A. A. Srnales, and the isotopic constitution of the lead separated from each mineral has been determined by Dr. W. T. Leland and Prof. A. O. Nier. The three ages calculated from the uraninite ratios AcD/RaG, RaG/U and AcD/U are 740, 733, and 733 m.y. The monazite is considerably altered but the corresponding ratios indicate that its age lies between 700 and 865 m.y., which is consistent with the more reliable estimate determined from the uraninite. It is shown from tectonic evidence that the Delhi erogenic belt is younger than the Satpura belt (previously dated at about 900 m.y.) and that both are younger than the Aravalli and Dharwar belts.

Dr. Trotter's recent theory of devolatilization of coal seams is criticized on structural grounds and the “square law” suggested is shown to be no improvement on many other expressions of varied types. The data are best represented both for South Wales and the Kent Coalfield by Hilt's law. The influence of depth of burial on coal vegetation is discussed; loss of volatile matter is probably promoted by temperatures, but is almost certainly retarded by high pressures. The Hilt rate is controlled by the chemical-physical factors and may be influenced also by varying rates of sedimentation during the accumulation of the Coal Measures.

Four new species of Calymenidae distinctive of horizons of strati-graphical interest are described. Observations of two pairs of anterior pits in the axial furrows of Platycalymene éire sp. nov. and P. duplicata (Murchison), not corresponding with the first lateral furrows of the glabella, indicate a trisegmental origin of the frontal lobe. A possible correspondence of the trilobite hypostome with chelicerae of Arachnids is propounded.