I regret that this short but important communication was too late for insertion in the December number of the Geological Magazine, as it was intended to announce the discovery of no less than four, if not five, new Genera of Amphibian Labyrinthodont Reptiles from the true Coal-beds of Jarrow Colliery, Kilkenny, Ireland.

Amongst the many objects of interest to the naturalist in that remarkable limb of the Western Highlands, variously written “Cantyre,” “Cantire,” or “Kintire,” are the raised beach and seaworn rocks which may be traced all along the coast under varying forms and aspects. This beach is the same as that which has been described by various writers as skirting the coast of Scotland from the Roman Wall northward, and winding through the innumerable fiords and sea-locks of the Firth of Clyde and the western coast; and to which attention was first called, I think, by Mr. Smith of Jordanhill, in 1836 and 1838, in papers read before the Geological and Wernerian Societies, and with other memoirs condensed into a small volume, in 1862. It is the last and by far the most strongly pronounced of all the raised beaches of Scotland—of which there are several—and is very graphically described by Mr. Geikie in his recent work. Now it is worthy of remark, that each of these authors draws opposite conclusions regarding the age of this raised beach from the same evidence; for Mr. Smith, of Jordanhill, considers the beach to be more ancient than the Roman period, and Mr. Geikie, on the contrary, more recent, both appealing to the position of the Roman Wall at its termination on the western and eastern coasts as evidence of the correctness of their views.

The beautiful crustacean, forming the subject of this paper, which is represented of the natural size in the accompanying plate, was obtained by Mr. J. W. Marder, from the Lower Lias of Lyme Regis, in Dorsetshire.

It is attempted in the accompanying diagram (Plate II.) to exhibit, as clearly as is possible in a single section, the local chronological arrangement and position of the more remarkable Cretaceous deposits between Folkestone and Guildford, and also their probable correlation with the same series in the Isle of Wight and the vicinity of Lyme Regis. The diagram therefore represents an ideal section of the Cretaceous series from Folkestone in Kent to Lyme Regis in Dorsetshire, exhibiting at a glance the relative positions of the strata in the order of their deposition, but without allowing for variation in thickness or possible want of conformity in stratification.