﻿346 
  

  

  Sir 
  E. 
  Ra) 
  r 
  Lankester. 
  On 
  some 
  

  

  areas 
  of 
  the 
  sculptured 
  surface 
  as 
  the 
  transposed 
  and 
  modified 
  representative 
  

   of 
  the 
  ventral 
  plane 
  and 
  the 
  dorsal 
  plane 
  of 
  a 
  fully 
  developed 
  rostro- 
  

   carinate. 
  

  

  Dr. 
  Peake 
  informs 
  me 
  that 
  the 
  bed 
  from 
  which 
  this 
  and 
  other 
  similar 
  

   flints 
  come 
  is 
  mapped 
  as 
  " 
  plateau-gravel 
  " 
  (Sonning 
  Common, 
  Oxon). 
  It 
  

   is 
  made 
  up 
  of 
  sand 
  and 
  gravel, 
  about 
  10 
  feet 
  thick, 
  resting 
  on 
  the 
  chalk. 
  

   Here 
  it 
  is 
  250 
  feet 
  above 
  sea-level. 
  Palaeolithic 
  implements 
  were 
  found 
  by 
  

   Dr. 
  Peake 
  on 
  the 
  surface 
  in 
  the 
  neighbourhood, 
  but 
  none 
  were 
  obtained 
  

   by 
  him 
  in 
  this 
  particular 
  bed 
  of 
  gravel. 
  

  

  Section 
  V. 
  — 
  The 
  Moir- 
  Martlesham 
  Jack-plane. 
  

  

  In 
  the 
  Oise 
  and 
  Burnham 
  specimens 
  we 
  have 
  seen 
  the 
  rostro-carinate 
  ideal 
  

   type 
  modified 
  by 
  the 
  removal 
  of 
  the 
  ventral 
  plane 
  to 
  a 
  lateral 
  position, 
  yet 
  

   still 
  recognisable. 
  In 
  the 
  Sonning 
  uncinate 
  not 
  only 
  has 
  the 
  area, 
  which 
  

   seems 
  to 
  correspond 
  to 
  what 
  was 
  " 
  the 
  ventral 
  plane," 
  moved 
  to 
  an 
  entirely 
  

   lateral 
  position, 
  but 
  the 
  dorsal 
  plane 
  is 
  not 
  certainly 
  recognisable. 
  The 
  

   rostrum 
  — 
  beak-like, 
  uncinate, 
  and 
  dominant 
  — 
  is 
  the 
  leading 
  feature 
  of 
  utility 
  

   and 
  permanence 
  in 
  those 
  specimens. 
  

  

  I 
  now 
  have 
  to 
  draw 
  attention 
  to 
  a 
  specimen 
  obtained 
  by 
  Mr. 
  Moir 
  from 
  the 
  

   sub-Crag 
  detritus 
  bed 
  at 
  Martlesham, 
  near 
  Woodbridge, 
  Suffolk,* 
  which 
  is 
  of 
  

   considerable 
  importance, 
  first 
  because 
  of 
  the 
  unchallenged 
  evidence 
  of 
  

   purposive 
  and 
  skilful 
  human 
  flaking 
  which 
  it 
  presents 
  ; 
  second, 
  because 
  of 
  its 
  

   undoubted 
  provenance 
  from 
  the 
  sub-Crag 
  bed 
  ; 
  and, 
  third, 
  because 
  it 
  presents 
  

   only 
  one 
  of 
  the 
  useful 
  features 
  of 
  the 
  rostro-carinate 
  type. 
  It 
  is 
  not 
  rostrate 
  

   and 
  it 
  is 
  not 
  carinate, 
  but 
  it 
  has 
  a 
  wonderful 
  smooth, 
  flat, 
  ventral 
  plane, 
  

   5-J- 
  inches 
  long 
  by 
  3^ 
  inches 
  broad 
  ; 
  the 
  mass 
  of 
  flint 
  surmounting 
  this 
  

   plane 
  surface 
  has 
  been 
  flaked 
  into 
  the 
  shape 
  of 
  a 
  pair 
  of 
  domes 
  or 
  promi- 
  

   nences, 
  the 
  hinder 
  of 
  which 
  gives 
  an 
  ideal 
  grip 
  for 
  the 
  right 
  hand 
  when 
  the 
  

   implement 
  is 
  used 
  as 
  a 
  "jack-plane." 
  One 
  margin 
  of 
  the 
  plane 
  retains 
  even 
  

   to 
  this 
  day 
  a 
  fine 
  cutting 
  edge 
  — 
  and 
  I 
  therefore 
  consider 
  this 
  as 
  the 
  anterior 
  

   border 
  — 
  that 
  which 
  was 
  moved 
  forward 
  when 
  the 
  implement 
  was 
  used 
  — 
  as 
  I 
  

   little 
  doubt 
  that 
  it 
  was 
  — 
  for 
  shaving 
  down 
  wood. 
  The 
  whole 
  " 
  balance 
  " 
  

   of 
  the 
  heavy 
  implement 
  suits 
  it 
  perfectly 
  for 
  use 
  in 
  this 
  way. 
  

  

  The 
  two 
  " 
  domes 
  " 
  are 
  separated 
  by 
  a 
  natural 
  valley 
  clothed 
  with 
  original 
  

   cortex. 
  It 
  is 
  marked 
  cort. 
  1 
  and 
  cort? 
  in 
  figs. 
  16 
  and 
  17. 
  Another 
  patch 
  of 
  

   cortex, 
  cort?, 
  is 
  seen 
  in 
  fig. 
  16. 
  A 
  whitish 
  calcareous 
  incrustation 
  covers 
  the 
  

   steep, 
  almost 
  vertical, 
  surface 
  of 
  fracture 
  {vert., 
  fig. 
  16) 
  which 
  rises 
  from 
  the 
  

  

  * 
  It 
  was 
  found 
  by 
  Mr. 
  Moir's 
  workman, 
  Baxter, 
  resting 
  upon 
  the 
  London 
  day 
  

   beneath 
  shelly 
  Eed 
  Crag 
  in 
  a 
  pit 
  in 
  the 
  nursery 
  garden 
  of 
  Mr. 
  R. 
  C. 
  Notcutt 
  at 
  

   Martlesham, 
  in 
  the 
  year 
  1912. 
  

  

  