Along the coast of North Cardiganshire, between Aberystwyth and Borth, numerous rock surfaces bearing “curious marks” have been found during the last few months. One such surface from this region has already been described, but except for a solitary fragment of rock from Transbaikalia this was apparently the only occurrence known anywhere until quite recently. The coast and inland exposures in the neighbourhood of Aberystwyth were explored at the time of the original discovery, but nothing of the same kind was found except a few indefinite traces; however, a more intensive search has now shown that these curiously-marked surfaces are by no means uncommon here.