Apart from the Scandinavian crescentic flint sickles recently described by Dr. Grahame Clark (Proc. Preh. Soc. E. Anglia, vii, 67–81) we are not aware that any demonstrable flint sickle-blades have yet been observed in Britain. It is therefore all the more interesting that in the sand-pit at Selmeston, Sussex, where Dr. Clark has excavated mesolithic dwelling-pits later occupied by Peterborough folk (Antiq. Journ. xiv, 134), there has lately come to light a flint flake that has indubitably been used as a sickle.