Having been connected with, mining works in this district, the writer offers the following particulars in reference to its seams of Coal, and resources for supply of fuel.

Dithyrocaris ovalis. W. and E. (Pl. V. Fig. 1), Mems. Geol. Survey, Expl. Sheet 23, Scotland, 1873, p. 100.

This species most nearly resembles D. Colei in outline, but is little more than half its size, and is quite destitute of the strong median and lateral ridges which mark Portlock's species.

In many places in Ireland, but conspicuous in the S.E. portion, there is a Glacialoid drift (that is, a drift very similar in aspect to some of the typical Glacial drift). This drift will be found in places above the shelly drifts of Wicklow and Wexford, and has led Prof. Harkness, F.R.S., to believe that in those counties there is evidence for two distinct periods of glacial drifts, one below and the other above the shelly drift. His classification has been adopted by Mr. A. Bell and others; still there does not appear to be evidence in Ireland for two distinct ages of glacial drift, separated by an interval, represented by sub-aqueous accumulations (sand, gravel, marl-clay, &c.), and the reasons for this conclusion will be given in this paper.

“Shells having the general form, of Productus, but uniformly with a narrow area on each valve, a foramen or callosity on the ventral area, small teeth, and more or less distinct teeth-sockets. The reniform vascular impression, rising from between the anterior and posterior occlusor muscular impressions, curves gently outwards, and, following a curvature somewhat parallel with the margin of the shell to below the middle of its length, is abruptly re-curved, and the extremity, turned a little backwards, terminates about halfway between the margin and the anterior extremity of the mesial septum. The cardinal process, seen from the inner side, is bilobed, and from the exterior side each of these divisions is usually bilobed.

Observations by Mr. Scrope on the subject to which he has so long devoted his attention demand respectful attention, and that I should endeavour to assign my reasons for not agreeing with the strictures which he has made upon my paper, read to the Royal Society in June, 1872.

In the last Number, foot of p. 66, the Rev. O. Fisher ascribes Mr. J. Clifton Ward's paper on Coral Eeefs and the Glacial Period to “Popular Science Review” for April, 1873, whereas it appeared in the “Quarterly Journal of Science” for that date.—Edit. Geol. Mag.