The irregular, flat greenstone pebble, worn away at both ends, shown in Fig. 166, has on one face only a notch, apparently intended to receive the thumb. It was found at Scamridge, Yorkshire, and is in the Greenwell Collection. It will be observed that it is worn into a curved ridge at one end. In the same collection is an oval quartzite pebble (4 1∕2 inches), battered at both ends, and with a slight diagonal ridge at that most worn away. This was found in a barrow at Weaverthorpe,[948] with an unburnt body. I have a flat greenstone pebble from |247| Scamridge, Yorkshire, worn away at one end to a curved ridge somewhat oblique to the faces of the pebble, one of which is slightly polished as if by constant rubbing. There is in the Greenwell Collection a granite pebble (3 1∕2 inches), from the same place, battered at one end, and the other much worn away by use, which also has one face flat and slightly polished. In the camp at Little Solsbury Hill,[949] near Bath, I found two quartzite implements of rudely quadrangular prismatic form, each having one end worn away to a ridge. Another quartzite pebble, rubbed to an obtuse edge at one end, was found by General Pitt Rivers, F.R.S.,[950] within an ancient earthwork at Dorchester, Oxfordshire. A hammer-stone of close-grained grit, having a ridge all round the periphery, was found in Anglesea.[951] Others with ridged ends have occurred in crannogs at Lochlee,[952] Ayrshire, and in Wigtownshire.[953] Some of them seem to belong to the Iron Age. Among the specimens just described, there are three peculiarities which, though not occurring together on all, are worthy of notice—the notch on the face, the ridge at the end, and the polished face. There can be no doubt of the notch on the face being, like the cup-shaped depressions, merely intended as an aid in holding the stone. On the hammer-stones discovered by the late Mr. J. W. Flower, F.G.S., in a post-Roman kjökken-mödding, in the island of Herm,[954] there were usually one or two rough notches or indentations on each face, exactly adapted to receive the ends of the thumb and some of the fingers; and, curiously enough, I have a pebble notched in precisely the same manner from Delaware Water Gap, Pennsylvania, and no doubt intended for a hand-hammer or pounder. In the same kjökken-mödding at Herm were several[955] celt-like implements of porphyry and greenstone which, instead of an edge, had the end blunt, but with a ridge obliquely across it, as on these pebbles. Somewhat similar pounding-stones have been found by the late Hon. W. O. Stanley, at Pen-y-Bonc,[956] Holyhead, in some instances provided with a depression fitting the thumb or finger, and several having the ridge at the end.