Except in containing small nodules of phosphate of lime, the Chalk shows no structural change where it terminates in the Ely section, but passes down almost imperceptibly into a dark greenish layer, and rests on it at an angle of about 35°. This greenish band, scarcely a foot thick, is full of nodules of phosphate of lime, and consists largely of glauconite. It is the Upper Green-sand, with Ammonites auritus, Terebratula biplicata, Dentalium ellipticum, and the usual local features. Nowhere can the passage of one rock into another be more marked than that of the Upper Greensand of this district into the Chalk. Conditions have changed a little with physical geography, but nothing suggests any break in time. About Cambridge the section is exactly the same; the Chalk just above is often flaggy, contains a few green grains, a little phosphate of lime, and the commoner Greensand fossils mixed with those of the Chalk. Sometimes, however, there are some 10 or 12 feet of dark greyish-green marls above the Upper Greensand. They are separated by sharp lines of bedding from the Chalk, are very local, and perhaps only indicate a trifling denudation of the Gault.

I obtained last summer, through the kindness of my venerable friend, Dr. Nils Nordenskiöld, of Helsingfors, a fine collection of Finnish focks and minerals, collected by his son, Professor Adolph Nordenskiöld, of the Academy of Science, Stockholm. Very little attention has been given in this country either to the rocks or mineral productions of this part of Northern Europe, although both are exceedingly remarkable. I propose, therefore, to introduce some of the more interesting in this article, giving at the same time a brief sketch of the general mineralogy of the land.

Since the publication by the palæontographical Society of the third part of my monograph of the ‘Eocene Mollusca’, containing descriptions of the several Eocene species of Cypræa then known, I have obtained from the beds in the New Forest, foeming parts of the Bracklesham Bay series, several additional species; and Mr. Wetherell has also been so fortunate as to obtain another remarkably fine species from the cutting lately made near Highgate for the Highgate and Edgeware Railway. I now forward descriptions of these new Cyprœœ for publication in ‘The Geological Magazine;’ and I avail myself of the same opportunity to correct an error committed by me in the same part of my monograph, in referring to Marginella pusilla, a species described by me from High Cliff, a small Marginella from Headon Hill, which I now propose to seperate under the specific name œstuarina.

In 1862 Mr. John E. Taylor (of Norwich), while surveying a newly-opened slate quarry at Dalby, on the western side of the Isle of Man, discovered three impressions of an oval form about nine inches long, and described them as resembling the tracks of Protichnites, figured in Owen's Plaæontology; the quarrymen told him that they were of frequent occurrence.

p. 184. line 14 from bottom, for John Young read James W. Young.

p. 188. line 12 from bottom, for Winch read Wiinsch.

p. 215. line 22 for of read and.

p. 219. bottom line, for tnberculosus read nodiferus.

p. 372. line 17 for Coptford read Copford.

p. 380. woodcut, for Pentre Glyn read Pentre Celyn.

p. 381. line 32 for Abbersley read Abberley.

p. 394. line 16 from bottom, for 5 a read 4 b.

p. 397. line 3 from bottom, for 4 b read 3 b.

p. 474. line 16, for to Clare read Co. Clare.