and that from Bury St. Edmunds, Fig. 419a, have lain in brick-earth instead of gravel, so that the edges are uninjured, minute marks of wear, as if from scraping or cutting, may be seen on the edges, principally opposite to this flat spot.
Both these and the oval sharp-rimmed implements are, as a rule, thin in proportion to their size. Specimens of the latter form are shown in Figs. 421 and 466.
The typical almond-shaped implements are scarcer than either of the foregoing. They also occasionally exhibit the flat spot already described, on one of their sides. A remarkably symmetrical and short example of this form is shown in Fig. 435.
The heart-shaped sharp-rimmed implements are rare, and resemble the sub-triangular, with the exception of their having a slight curvature inwards at the base. One of these is shown in Fig. 432. Mr. Stevens considers, that if any of the drift implements were used as spear-heads, they were of this form.
The sub-triangular sharp-rimmed implements are much rarer than those of the tongue-shaped character, in which the base of the triangle is blunt. Fig. 471, however, belongs to this class, though it is much rounded at the point. Some of the cave-implements, like Fig. 386, are intermediate between this and the ovate form. Among the curious implements, apparently of Palæolithic age, which have been found in some abundance in parts of Poitou, the sharp-rimmed sub-triangular type is common. The form has also been found in the Department of the Aisne,[1] and in the cave of Hydrequent, in the Pas-de-Calais.
The lozenge-shaped implements of this class are pointed at each end, but the sides are never straight. Fig. 440 shows a thick specimen of this form. Some of the large flat implements from the valley of the Somme are more of the pointed oval or vesica piscis form, than lozenge-shaped.
The lunate and perch-backed implements having one side considerably more curved than the other are very scarce, but more have been found at Santon Downham than elsewhere. One of these is shown in Fig. 436, and another from Shrub Hill in Fig. 448. I have also met with the form among the implements from Barton Cliff, Hants. They are possibly mere accidental varieties of the oval or ovate form; and indeed it seems doubtful whether it is worth while to insist much on these subdivisions of form, many of which must, necessarily, have resulted from the manner
- ↑ Watelet, 1866.
