part 3] A NATUJftAL ' EOLITH ' FACTORY. 245 



with the notch [' encoche '] forming a prominent feature in the 

 forms produced. 



(14) PI. XV. — Photograph of an unfinished rostro-carinate in 

 the making, shown from the under surface, with the series of flakes 

 removed. 107 x 67 X 48 mm., 80°. 



(15 b) P. 242. — Side view of carinate form, showing the details 

 of the flaking. (15c?) Basal view, showing the 'ventral plane,' 

 made hy one long clean flake-scar, from which the flaking along 

 the edge was subsequently removed. 112 x 57 X 90 mm., 90°. 



(16) P, 244. — Claw-like form ; the major flake from the notch 

 was found in place, while the basal plane was formed by a fracture 

 of earlier date. 142 x 91 x 71 mm., 85°. 



(17) Another good example of the same form, the basal plane 

 being formed of the natural cortex of the nodule. The apparent 

 intelligence in the flaking of the butt-end for the accommodation 

 of the hand-grip is particularly striking. 127 X 87 X 60 mm., 86°. 



(18) This is also a notable rostro-carinate, with double curva- 

 ture, and again some flaking at the butt-end for the apparent 

 accommodation of the hand-grip. 169 x 91 x 53 mm., 85°. 



(19&) Side view of a flint which closely resembles one of the sub- 

 Crag type-specimens preserved in the British Museum. (19 «) Out- 

 line, seen from above (scale 2 x i)i n being the notch shown in 

 the lateral view. There is no flaking in this case round the outer 

 curve r, but notable shaping at the butt-end for the apparent 

 accommodation of the hand-grip. The basal plane is remarkably 

 well ' prepared ' by clean fracturing. The largest flake with very 

 good pressure-bulb was recovered, but the smaller chips were too 

 severely crushed for useful preservation. 114 x 59 x 74 mm., 95°. 



(20) P. 246. — Straight carinate form, of triangular section, 

 resembling the inverted prow of a boat. 76 x 48 x 46 mm. 



(21) This belongs to the same group as 20, but it more nearly 

 resembles the celebrated sub-Crag ' test-specimen ' on a slightly 

 smaller scale. The basal plane is formed of a hinge-fracture. The 

 last flake removed, which truncates slightly more patinated facets, 

 was recovered ; but the earlier flakes appeared to have been carried 

 away by the movements of the soil, as careful search immediatelv 

 around the specimen failed to disclose them. The second drawing, 

 21 x, shows the specimen with this last flake replaced. 72 x 48 

 X 38 mm. 



(D) The Flakes. 



The best selected flakes from this bed are by far the finest 

 examples of mechanical, or non-human, flaking that I have ever- 

 seen : and, if they were mingled with flakes from a prehistoric 

 working-floor, they could never be separated again, unless it were 



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