On he Red Sandstone and Conglomerate, and the superposed Quartz-rocks, Limestones, and Gneiss of the Northwest coast of Scotland," Quart. Journ.

While tracing the various subdivisions of the Durness Series of quartzites and limestones from Sutherland southwards into Rossshire, careful attention has been paid to any indications of fossiliferous zones which might throw additional light on the age of the strata. During last season's campaign, certain sections in the Dundonnell Forest happily furnished the evidence which has been eagerly sought after. Physical Features of the Dundonnell Forest. Between Little Loeir Broom and Loeh Maree the members of this series traverse one of the wildest tracts in the west of Ross-shire. The Dundonnell Forest lies mainly to the south of the head of Little Loch Broom, stretching southwards by An Teallach (3483 ft.) to Loch an Nid and Creag Rainich (2646 ft.). The southern portion of the Forest is drained by the Loch an Nid river, which, finding its source in the loeh of that name, flows northwards for about three miles towards the shooting-lodge of Achneigie. The river is bounded on the east for part of this distance by a precipitous crag (1000 ft. high), and on the west by the long dip-slopes of quartzite and Torridon Sandstone of Sgurr Ban (3194 ft.) and Ben a Chlaidheimh. Near Achneigie the river bends towards the north-west, soon pouring its waters into Loch na Sheallag. From this loch issues the Gruinard river, discharging into Gruinard Bay. The sections from which the fragments of Olenelluz were obtained occur along the eastern slope of the valley drained by the Loch an Nid river, between Loch

By the permission of Professor A. C. Ramsay, LL.D., F.R.S., Director-General of the Geological Survey of Great Britain and Ireland, and Professor Geikie, LL.D., F.R.S., Director of the Geological Survey of Scotland, I have been permitted to describe several new Crustaceans which have come under my notice in my capacity of Acting Palæontologist to the Scotch Survey. They are from the cement-stone group of the Calciferous Sandstone series of the Scottish border, and, with a very few exceptions, were got from one locality on the river Esk, about four miles south of Langholm, in Dumfriesshire, and were almost all collected by A. Macconochie, Fossil Collector to the Geological Survey of Scotland. They belong to two orders, viz., Phyllopoda and Decapoda.

I. I ntroduction . O ne of the most interesting problems connected with glacial geology is the explanation of the glaciation of those group~ of islands which lie at some distance from the north-east corner of the mainland of Scotland. It is now almost universally admitted, by those who have carefully weighed the evidence, that during the maximum cold of the glacial period, Scotland, Ireland, and the greater part of England were buried underneath an ice-sheet, which moved off the high grounds towards the sea-level. This has been clearly proved by the careful mapping of the ice-markings indicating the trend of the old glaciers, as well as by a minute examination of the stones in the Boulder-clay which accumulated underneath the ice, and was rolled along with the onward motion of the mass. So far most geologists are agreed; but when the glaciation of the Orkney and Shetland Isles has been discussed, it has given rise to considerable difference of opinion. Doubtless this want of uniformity has been largely due to the imperfect evidence hitherto obtained from the isles regarding the direction of glaciation and the nature of the various superficial accumulations. There has been no systematic examination of Shetland, or even of Orkney, with a view to determine these questions ; and hence the absence of reliable observations has given scope for some latitude of opinion, and has likewise retarded the final settlement of the question. The group of islands to which this paper especially refers may be said to form a

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