FROM GRAYS, ESSEX. 113 Terrace gravels, which are without doubt of the same age as the gravels at St. Acheul. It also occurs in the still older Palaeoliths, the "Hill Group" of Sir Joseph Prestwich. Hence, in my opinion, this type cannot be considered to be in any sense dis- tinctive of a particular period. That there is a difference between the tools from Le Moustier and the High Terrace implements cannot be doubted, and judging from workmanship the latter are the older. In my opinion the implements from the Middle Terrace of the Thames are of the Mousterian age. To this period I would assign the LONGITUDINAL AND TRANSVERSE SECTIONS OF THE GRAYS IMPLEMENT, ALONG THE LINES INDICATED IN PLATE VI. Palaeolithic Floors at Grays, Crayford, and Stoke Newington, some of the implements from Ilford (several of the Palaeoliths from this locality are undoubtedly derived from the High Terrace), and many other localities outside the Thames area, as at Hoxne, Hitchin, Mildenhall, Caddington, etc. I have pleasure in presenting the implement above described, to the Essex Museum of Natural History, and I must not forget to thank Mr. F. W. Reader for excellent photographs of the stone. 1 A Guide to the Antiquities of the Stone Age in the Department of British and Mediaeval Antiquities, British Museum, 1902. Page 23. Two specimens from Suffolk are figured (figs. 20 and 21). H