I had hoped that ere this some one better acquainted than myself with Irish post-Tertiary Geology would have collected into one memoir the details scattered throughout the various scientific journals, thus enabling English geologists to compare the later deposits of Britain with those of the sister-kingdom. Since no one has done so, I venture to put some notes of my own upon the subject before the readers of the GeologicalMagazine, especially as, in some recent discussions upon the Irish drift, “Palæontological succession” has not received the consideration it may fairly claim.