As I have prepared descriptions of nearly all the fossils of Victoria collected by the Geological Survey under Mr. Selwyn for some years, I have been urged to make a preliminary publication in the Geological Magazine of some ofthe remarkable forms, and I now forward my descriptive note of the two Tertiary Trigoniœ, on account of Mr. Jenkins' paper in the May number of this Journal, in which one of them is referred to the recent T. Lamarckii. I feel assured that if Mr. Jenkins will look at the edge along the ribs, towards the beak of a recent specimen of T. Lamarckii and my T. acuticostata from the Tertiary beds, he will at once appreciate the distinctive form of the ribs which I point out and figure in the annexed woodcut.

The pages of the Geological Magazine have lately contained some interesting articles on denudation. I wish to add some further remarks on the subject, which I think will, if duly considered, add important elements to the discussion of that problem.

The Upper Llandeilo Rocks of the South of Scotland have long been known to yield graptolites in great profusion, few other forms of animal life being recognised as occuring in them. Having, this summer, had an opportunity of examining the graptolite-shales of Garple Linn, near Moffat, I was struck with the occurrence in them of numerous bodies, differing from the graptolites in form, though resembling them in mineral texture.

Lough Corrib is a long irregular lake of various widths, but having a general bearing of about N.W. and S.E. Its N.W. portion is in a granite and metamorphic rock country, while the rest of it overlies Carboniferous rocks, principally limestone. The northern portion is deep, the southern shallow, and through the whole of it are scattered numerous islands which, in the former part, are generally composed of Boulder-clay, while those in the latter portion are nearly always rock. Its known natural outlets are two, one being over the barrier of metamorphic rocks at Galway (U on Map, Pl. XIX), and the other subterranean passage south of Castlegar (T on Map, Pl. XIX). On all sides of the lake are rocks extending under it, or, to use Professor Ramsay's term, it lies in a “Rock-basin.” What excavated this Rock-basin? I propose in this paper to consider.

1. The brown Boulder-clay corresponds with the brown Clay of the Eastern counties, and is oldest.

2. Then the hill gravel, the blue Boulder-clay, and perhaps the shell bed of March corresponds to the contorted drift.

3. As elevation progressed, the Fenlands would become one great fiord, ramifying at the Cambridge end up the southern valleys in the Chalk. First the coarse gravels of low levels were formed, and finally, during a long period—for the flints are wonderfully worn—the fine gravel of the plains. After which the country was elevated, and the sea denuded the superficial beds and retired. This corresponds to the Upper Boulder-clay and coarse gravel of the Norfolk section.

4. Now rivers cut their channels, and there commenced luxuriant vegetable growth, which corresponds with the excavation of the Mundesley river and the Mundesley peat.

5. Then a depression, during which was formed the Buttery-clay the Fens. This corresponds with the Upper Sands and Gravel of Mundesley.

6. And, finally, comes the second peat and the present state of nature.

I believe this succession is true for a far larger area than the Fenlands, perhaps for all Great Britain.

The fashionable Belgian watering place, Spa, is situated 1000 feet above the sea, in the centre of a circle of hills called the High Moors (Lea Hautes Fauges), a wild and desolate tract covered with peat-bogs and heaths, themselves some 600 to 800 feet above the town. Immediately above Spa, and opposite to it, there are two other distinct hills, of lesser height, the limits of which are definitely marked out by streams or deep valleys, and these, together with the “High Moors” and their rock, constitute the leading geographical features of the immediate neighbourhood.