In the Greenwell Collection is another nearly circular tool, about 2 inches in diameter, ground to an edge along most of the periphery, and found in Yorkshire. Another rather smaller disc, in the same collection, |342| and found at Huntow, near Bridlington, is partly ground on both faces, but not at the edge. A circular knife of the same kind was found at Trefeglwys,[1544] Montgomeryshire. It is 2 3∕4 inches in diameter and ground to an edge all round except at two places at opposite ends of one of its diameters, where for a short distance the edge is left as it was originally chipped out. It is now in the Powysland Museum. A circular knife from Mam Tor,[1545] Derbyshire, is in the Castleton Museum. [Illustration: Fig. 257.—Kintore. 1∕2] [Illustration: Fig. 258.—Newhaven, Derbyshire.] In the Greenwell Collection is an implement, about 2 inches in diameter, found at Sherburn Carr, Yorkshire, and in outline like a scraper, but with the greater part of the semicircular edge sharpened by grinding. In character it much resembles some instruments occasionally found both in Britain and Ireland, of which an example is given in Fig. 257. This is a horseshoe-shaped blade of flint, 3 inches over, with the rounded part of the circumference ground to a fine cutting edge, so that it was probably used as a knife. It is in the National Museum at Edinburgh, and was presumably found near Kintore, Aberdeenshire. In the same Museum is another instrument of the same kind, but somewhat kidney-shaped in outline, found in Lanarkshire. It is 3 3∕8 inches in length, and 2 5∕8 inches in extreme width. On a part of the hollowed side it shows the natural crust of the flint, but the rest of the periphery is ground to a sharp edge, and the projections on the faces have been removed by grinding. Others were found at Pitlochrie,[1546] Kincardineshire, and Turriff,[1547] Aberdeenshire. Mr. C. Monkman, of Malton, had a knife much like Fig. 257, 2 3∕4 inches across, which was found at Huntow, near Bridlington. I have an Irish specimen from near Ballymena almost like that from Kintore, as well as one of longer horseshoe shape found at Swan Brake, North Stow, Bury St. Edmunds, another large |343| one more subtriangular (3 8∕10 by 3 1∕2 inches) found near Wallingford, and a broad hatchet-shaped one from the Cambridge Fens.