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122 regular curve and blunted. This also was given to me by the late Mr. C. Monkman, of Malton.

A curious variety of celt is shown in Fig. 66, the original of which was found at Whitwell, in the North Riding of Yorkshire, and forms part of the Greenwell Collection. It is made of a hard, shelly limestone, apparently of Oolitic age, the surface of which has been partially eroded. It is nearly flat on one face, and seems to have been intended for mounting as an adze. Other celts of similar material have been found in the same district, and Canon Greenwell has kindly presented me with one of much the same character as this, though far broader in pro- portion to its thickness. This specimen, which was found at Osgodby, closely resembles in section that from Truro, Fig. 84.

A specimen of the type of Fig. 66 (7 inches) is in the British Museum. It was found at Creekmoor, near Poole, Dorset.

Some of the large celts from the Shetland Isles present the same peculiarity of being flat on one face, but, as the sides are much rounded, I shall include them among those of Oval Section.

These, of oval section, form the third subdivision of polished celts, which I now proceed to describe.

It will be observed that implements of this character, formed of flint, are extremely rare. The reason for this appears to be, that from the method in which, in this country, flint celts were chipped out, the sides were in all cases originally sharp, and they had a pointed oval, or vesica piscis, section. In polishing, this form was to a great extent preserved, though the edges were, as has been seen, sometimes ground flat and sometimes rounded. It rarely happens, however, that the rounding is carried to so great an extent as to produce such a contour that it is impossible to say within a little where the faces end and the sides begin; though this is often the case with celts of greenstone and other materials, which were shaped out in a somewhat different manner, and in the formation of which grinding played a more important part. It is almost needless to say that I use the word oval in its popular sense, and not as significant of a mathematically true ellipse. At the part where the edge of the celts commences, the section is of course a vesica piscis.

The first specimen engraved. Fig. 67, is in my own collection, and was found in the Thames at London. It is of dark greenstone, and, owing to a defect in the piece of stone of which it was made, there is a hollow place in one of the faces. General Pitt Rivers has a similar but more symmetrical celt, of the same material, also found in the Thames. Another, smaller, from the same source, is in the British