Records of certain trilobites and brachiopods illustrated in Charlesworth's Geology of Ireland are critically discussed.

From an analysis of data concerning five breccias in the Billefjorden area, Central Vestspitsbergen, and from a consideration of explanations previously advanced of other breccias, it is concluded that the main breccias are due to collapse following solution within the underlying beds.

A new species of Palaeechinus, and the first certain member of that genus from North America, is described and several unusual features of its test noted. The apical disc of the specimen is extremely well preserved.

Monograptus scanicus is shown to possess thecae which terminate in a pair of laterally-placed, expanded lappets; these are elongateovoid in shape, set with their long axes at right-angles to the axis of the theca.

Daviesiella destinezi (Vaughan), a large concavo-convex brachiopod, is very common in some of the Lower Carboniferous limestones of North-West Ireland. It appears to be confined to the C2S1 subzone. Easily recognizable in the field, it is thus a useful index fossil of the subzone. As the previous descriptions of the species are far from complete, a detailed description of some unusually well-preserved specimens from Co. Fermanagh is given and an attempt is made to relate certain features of the morphology of the specimens to their environment.

The growth of the rhabdosome from the initial prosicula is described for two species of Monograptus. Sections of the metasicula have shown the nature of the “Stillstandsgürtel” first described by Kraft, and in both species evidence about the structure of the interthecal septum is given. It appears that there are two forms of Monograptus dubius which have the same external appearance but differ in the details of early development.

Mr. Blundell's account of earlier work by A. F. Hallimond and J. T. Whetton (Bull. Geol. Surv. No. 2., pp 1–17, 1939) is inaccurate in certain particulars and is liable to mislead.

The occurrence, very rare in Karroo rocks, of a gastropod species in the Lower Beaufort stage (Upper Permian) of Southern Rhodesia is recorded. It is a small form apparently related to species found in the Tartarian stage of the Russian Permian. These species have been described under extinct marine genera, but on account of their morphology and non-marine habitat this is thought to be inappropriate. The new species much resembles some representatives of the modern genus Hydrobia, not previously recognized in pre-Mesozoic rocks, and it has been decided to describe it as a new species, Hydrobia gondwanica.