A Remarkable Flint Implement from Selsey Bill. 



167 



In figs. 4 and 5 careful drawings are given of two hammer-stones — a larger 

 and a smaller — found in association with the Selsey rostrate and presenting 

 the same colouring and mineral condition of the flint which characterise that 

 implement. They have been flaked so as to furnish a prominent apex which 

 shows evidence of its use as the striking surface in the fact that it is more or 

 less comminuted. The smaller of the two hammer-stones is flaked so as to form 

 a four-sided pyramid and is similar in this respect to the four-sided pyramidal 

 hammer-stone from the Sub-crag detritus or nodule bed figured in my paper, 

 ' Phil. Trans./ B, vol. 202, p. 313. It is a fact of distinct importance tending 

 to associate the specimens from Selsey Bill with those of the Sub-crag deposit 

 of Suffolk, that a four-sided pyramidal hammer-stone is among the implements 

 discovered in both localities. 



EXPLANATION OF PLATES 8 to 11. 

 (Eeproduced from water-colour wash-drawings made by Miss Gertrude Woodward.) 



Plate 8. 



Fig. 1. — The large' Selsey rostrate flint implement ; dorsal surface. Drawn of the actual 

 size of the specimen. 

 A. Scar of very large conchoidal flake removed from the left side of the rostral 

 region. 



1 and 2. Scars of parallel ribbon-like flakes removed from the region to the 

 right of A. 



Cort. Portions of the original cortex of the nodule. 



Plate 9. 



Fig. 2. — The large Selsey rostrate ; ventral surface. Drawn of the actual size of the 

 specimen. 



Cort. Small area of cortex or original " bark " of the nodule. 



R, S, T, V, X, point to " conchoidal ripplings " of the fractured surface, each letter 

 pointing to the conchoidal fracture produced by a separate blow : some heavy, 

 some light. 



Plate 10. 



Fig. 3. — The large Selsey rostrate, right lateral surface. Drawn of the actual size of the 

 specimen. 



Cort. An area of cortex or original bark of the nodule (see fig. 1, right side, for 

 the same area). 



3, 3, J/.. Scars whence ribbon-like flakes have been struck, the scar 2 is seen in the 

 view of the dorsal surface given in fig. 1 ; scars 3 and 4 are noticeable for the 

 conchoidal transverse rippling of the flint. 



5 is the scar of a broader flake parallel to 2, 3, 4, which is truncated by the well- 

 marked conchoidal scar, 6, of another shaping-flake. 



