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554 gravels of the valley of the Somme. The magnificent implement from the gravel of Vaudricourt, near Béthune, which was exhibited at Paris in 1867, was also much of this type. Its length is 10 inches; that of the Thetford specimen being 8 inches. It would be an endless task to attempt to engrave all the varieties of form found at this place, but Mr. Trigg is correct in his remark as to the comparative absence of the flat oval form with a cutting edge all round. The most common type here is the ovate-lanceolate, like Pl. I., Fig. 5, rather thick towards the butt-end. Mr. Flower has figured a fine lanceolate specimen, and one of more ovate form from this place.

Fig. 429.—Redhill, Thetford.

The finely-wrought symmetrical specimens are rarer at Redhill than at Santon Downham; but here, as elsewhere in this district, implements are occasionally found of what has been aptly termed the shoe-shaped type, of which an example is shown in Fig. 429. The form is flat on one face, the other being brought to a central ridge rising towards the butt, which is usually rounded and obtusely truncated. In this specimen the greater part of the butt-end or heel of the shoe exhibits the original crust of the nodule of flint from which the