In this review of the Downtonian Eurypterida of Perton, Here-fordshire, a new genus Salteropterus and a new family Hugh-milleriidae are proposed, and the family Pterygotidae accordingly emended. Hitherto unknown morphological details of the Perton Eurypterida are described and discussed.

The metamorphism of Pre-Cambrian dolerites in the Northwest Highlands is described and compared with that of basic rocks in the Southwest Highlands, Banffshire and other regions. The first products of metamorphism are not the same in every area. It is suggested that the trend of regional metamorphism differs according to the environment in which it took place, and that a sequence of changes established in one area cannot be used as a standard by which to judge the changes in other areas. In particular, rocks of high metamorphic grade have not invariably passed through stages characterized by low-grade minerals.

During the Permian the time involved in orogeny, erosion and deposition of continental and marine deposits, and the evolution of its characteristic faunas and floras, is comparable with that of other established Systems. The Permian in the Midlands has been for many years officially classed with the Carboniferous or Trias, in some cases with a query, separated by a great unconformity. It is now urged that it should be separately represented, and include all the deposits in the Midlands from the base of the Enville Beds to the top of the “Dune Sandstone”, now called Lower Mottled Sandstone of the Trias.

Erosion of headlands along the southern coast of Victoria results chiefly from the attack of storm waves, and is concentrated above a defined level, marked by certain level shore platforms, whose surfaces are at about high tide level. These platforms are initiated and maintained by storm wave erosion. Their surfaces undergo planation and lowering, chiefly by the scouring action of waves of translation, but increasingly by water-layer weathering as the platforms age and widen.

Study of profiles, perpendicular to the fold-axes, shows that the folding is disharmonic. Nearly every s−surface is one of décollement. In some exposures the quartzites are reduplicated by superposed recumbent-folds without infolds of other material. The contacts are tectonic and not stratigraphic. Incipient boudinage is frequent, and nearly all surfaces show well-developed b−lineation.

An epidiorite sill emplaced in quartzites becomes charged with xenoliths of quartzite and of an amphibole-rich rock possibly derived from underlying limestone horizons. The matrix of the xenolith-rich part of the sill is studied with large hornblende-biotite “crystals” that may represent small limestone xenoliths that have been basified and homogenized.

In the Arkaig district of Inverness-shire there is a well-defined suite of camptonite-monchiquite dykes, and several of them have been observed to be displaced laterally along sinistral faults. This provides direct evidence of transcurrent faulting in Permian or post-Permian times. Similar faulting may have occurred along the major northeasterly fracture lines of the Highlands.

Tertiary and Pleistocene sediments, largely calcareous, and certain metamorphosed limestones, are described from the Cape Verde Archipelago.