The author referred to the paper on the Elie Glacial Clay, with Shells, read by him on the 2d of March 1863. During the succeeding summer he learned from Dr M'Bain, that shells had been found in a brickfield near Errol, but so badly preserved, that none of the species had been determined. During the autumn, while staying in the neighbourhood of Perth, he took occasion to visit the Errol brickfield, and found that the shells, which occur in considerable abundance, are precisely the same group with those at Elie.