24 SUTCLIFFE, Tendencies in Prehistoric Anthropology. 



DESCRIPTION OF PLATES. 



Description of four flints similar to those described by Sir 

 E. Ray Lankesteras Rostro-carinate implements. All are derived 

 from the High Level gravels of Hackney Down, North London, 

 and are associated with implements of exactly similar material 

 and patination of ordinary Chellian type. 



u. Hacknev Gravkls. O. 1872. Manchester Museum. 



A large flint partly honey-coloured and translucent, the lower 

 surface stained a bright yellow orange, flne lustrous patina. 



Ventral surface formed by one large conchoidal fracture with 

 the anterior part removed by another conchoidal surface less 

 stained and patinated and hence a later date. The left edge is 

 removed by a narrow longitudinal flake. 



Dorsal surface with a high keel running posteriorly into a 

 patch of original surface. 



Right side formed by one large flat fracture surface cut into 

 by a conchoidal fracture starting from the lower edge. 



Left side also formed by a single surface, the lower ed 

 being removed by the flake described above. 



Beak rounded and formed by five small flakes. 



x'\ll edges and angles battered. 



Flint terminated behind by one fracture surface. 



Compare with Phil. Trans., B., vol. 202, p. 303, figs. 12 

 and 13. 

 /i Hackney Gravkls. O. 1874. Vl. I\L 



A medium-sized ocherous flint. 



Ventral surface flat, not formed by any definite fractures, 

 but not original crust. 



Dorsal surface vaulted, with a keel anteriorly ; left posterior 

 region formed by natural crust, the rest by indefinite fractures. 



Right side near the beak formed by one small conchoidal 

 fracture. 



Left side formed by two conchoidal fractures and numerous 

 secondary flakes. 



All edges and corners much battered. 



