.irnNcI/csfrr yfrniflirs. Vol. hit. (19 13), No. 1. 25 



7. Hackney. O. 1875. M. M. 



A small flint of grayish colour, considerable pati nation and 

 no staining. 



Ventral surface flat, formed by the natural surface of the 

 flint, except for a minute chip under the beak. 



Dorsal surface with a pronounced median ridge, which is 

 rounded. 



Rii^ht surface formed by a single fracture, shewing no 

 primary bulb of percussion. 



Left surface formed by a single fracture, modified by three 

 subsidiary flakes, with bulbs of percussion at the lower edge. 



Beak formed by one small flake on the top side and a small 

 fracture on the dorsal surface. 



Point and edges battered. 



cf. Phi. Trans., B., vol. 202, p. 302, figs. 10, ir. 



^. Hackney. O. 1873. M. M. 



A large flint of grayish brown colour and considerable 

 polish. 



Ventral surface formed by an irregular natural surface pos- 

 teriorly, by two smooth flat fracture surfaces anteriorly. 



Dorsal surjace hugely formed by original crust, one large 

 flake in the middle and several posteriorly, a small flake across 

 the beak. 



Right sufface formed by two large flakes. 



Left su?face. One large fracture and a small anterior chip 

 forming the beak. 



Beak and all other edges rounded and battered. 



cf. Phil. Tians., 11, vol. 202, p. 308, figs. 20, 21. 



