My friend and colleague, Mr. Goodchild, has contributed to the Geol. Mag. for July, August and October last, articles on Glacial Erosion in the Yorkshire Dale District, in order to evoke criticism; and as no one who knows the ground has come forward to reply in detail to his arguments, I am induced to offer some notes of my own on the subject.

Shell very elongated, angle less than 10°, composed of eighteen or possibly more elevated, squareish whorls, which slightly diminish in convexity in descending the spire; apex acuminate (Plate IV. Fig. 4); ribs ten or eleven, straight or slightly sinuous, linear near the apex, but becoming more prominent and obtuse with the growth of the shell, the intervening spaces nearly flat. The ribs, in common with those of other Cretaceous Scalidæ, are never so clean and sharp as in the recent species, but have more the appearance of folds. In some of the larger specimens the ribs disappear altogether on the last three or four whorls, and are represented only by more or less strongly marked lines (Plate IV. Fig. 1). The striæ are fine and numerous (Plate IV. Fig. 1a), fifty or sixty on each whorl. The sutures are very distinct, the margins of the whorls being usually raised into a roll-like collar. This collar appears on the last whorl in the form of a conspicuous spiral keel, against which the ribs terminate, leaving the base of the whorl, which is very flat, marked with striæ and lines of growth only. The aperture is oval or quadrate, and in the perfect state was probably terminated anteriorly in a sort of beak (Plate IV. Figs. 2 and 3); lips thin!; columella smooth. The cast of the shell generally preserves the rib marks, except near the apex, where the whorls are smooth and very rounded.

In a paper on the above subject, that appeared in the GeologicalMagazine for December, 1875 (p. 583), the author, Mr. S. Allport, F.G.S., objects to the introduction of additional rock names. With this observer I agree that there are many ingenite rock names which it would be satisfactory to get rid of; seeing many varieties and subvarieties of rocks to which names are given have no permanent characters; while in numerous cases the same rock is called by different names. Still, as a geologist, I would suggest, that in some cases new names are absolutely necessary, if we would impart our increasing knowledge to the general public; for instance, among the granitic rocks, the subject that has led to Mr. Allport's remarks.

There is a peculiar band, full of Annelid borings, in the Gault of Kent, which does not appear to have been recorded in the papers on the Gault of Folkestone, by Mr. De Rance, in the Geol. Mag. 1868, Vol. V. p. 170, etc., and Mr. Price, Quart. Journ. Geol. Soc. 1874, vol. xxx. p. 344, etc. It may possibly, however, be one of the “hard bands” noticed in their sections, but not described in detail. In 1866 I collected some specimens of this Annelid Bed in a Gault pit, dug for brick- and tile-making, at Westwell Leacon, a mile and a half S.W. of Charing, Kent. It was about two inches thick, continuous across the pit, red in colour, with bluish pipings throughout in every direction; it was much harder than the blue clay above and below, and relatively heavy. There seemed to be only one band of it; and its fragments were picked out and thrown aside by the clay-diggers, who called it “Harper.”

VI. Jura.—In all probability the strata which form the summit of the mountain north of Reindeer Valley in Saurie Hook belong to the Jurassic formation, which besides occupies a considerable extent on Spitzbergen, from the entrance of Ice Sound to Cape Agardh in Stor Fiord. To judge from the beds at the latter place, the only one that I know of which affords a comprehensive section of the different strata belonging to this formation, the Jurassic strata of Spitzbergen consist of—