﻿496 
  MESSRS. 
  E. 
  T. 
  NEWTON 
  AND 
  J. 
  J. 
  H. 
  TEALL 
  ON 
  [Dec. 
  1 
  89 
  7, 
  

  

  (i) 
  Black 
  shale 
  4 
  inches 
  thick, 
  from 
  just 
  below 
  the 
  basalt. 
  

   There 
  is 
  no 
  appearance 
  of 
  this 
  shale 
  having 
  been 
  heated 
  to 
  any 
  

   extent 
  by 
  contact 
  with 
  the 
  basalt. 
  

  

  (ii) 
  Black 
  material 
  like 
  the 
  preceding, 
  but 
  broken 
  into 
  fine 
  

   particles 
  and 
  powder, 
  1^ 
  inch 
  thick. 
  

  

  (iii) 
  Greenish-grey 
  shale, 
  3 
  inches 
  thick. 
  

  

  (iv) 
  A 
  lighter-coloured 
  brownish 
  clay-shale, 
  the 
  thickness 
  of 
  

   which 
  is 
  not 
  recorded. 
  

  

  3. 
  Elm 
  wood. 
  

  

  In 
  a 
  watercourse 
  at 
  the 
  back 
  of 
  Elmwood 
  the 
  rock 
  is 
  uncovered 
  

   at 
  a 
  point 
  about 
  50 
  feet 
  below 
  the 
  basalt, 
  and 
  from 
  this 
  exposure 
  of 
  

   ' 
  clay 
  sandstone 
  ' 
  a 
  small, 
  well-preserved 
  ammonite 
  was 
  obtained 
  

   (PL 
  XXXIX, 
  fig. 
  5). 
  

  

  Unfortunately 
  this 
  ammonite 
  is 
  the 
  only 
  specimen 
  which 
  was 
  

   found 
  in 
  place 
  at 
  this 
  spot, 
  but 
  in 
  the 
  same 
  watercourse 
  below 
  the 
  

   exposure 
  of 
  rock, 
  and 
  apparently 
  fallen 
  from 
  the 
  rocks 
  above, 
  a 
  

   number 
  of 
  other 
  specimens 
  were 
  collected, 
  chiefly 
  in 
  blocks 
  of 
  clay- 
  

   ironstone. 
  Among 
  these 
  are 
  ammonites 
  identical 
  with 
  that 
  found 
  in 
  

   place, 
  as 
  well 
  as 
  others 
  which 
  arc 
  referable 
  to 
  A. 
  macrocepltalus 
  

   and 
  A. 
  modiolaris. 
  

  

  The 
  number 
  of 
  species 
  found 
  at 
  this 
  locality 
  is 
  not 
  great, 
  and 
  they 
  

   will 
  now 
  be 
  considered 
  in 
  detail. 
  

  

  Ammonites 
  (Cai)oceras)Tchefkini 
  ?, 
  d'Orb. 
  (PI. 
  XXXIX, 
  figs. 
  4-6.) 
  

  

  To 
  this 
  species 
  is 
  referred 
  provisionally 
  the 
  one 
  ammonite 
  (fig. 
  5) 
  

   found 
  in 
  situ 
  50 
  feet 
  below 
  the 
  basalt 
  at 
  Elmwood, 
  as 
  well 
  as 
  several 
  

   other 
  specimens 
  found 
  in 
  the 
  watercourse 
  below 
  this 
  exposure 
  and 
  two 
  

   others 
  from 
  the 
  side 
  of 
  the 
  glacier 
  at 
  the 
  western 
  end 
  of 
  Cape 
  Flora. 
  

  

  The 
  ammonite 
  found 
  in 
  situ 
  is 
  about 
  22 
  mm. 
  in 
  diameter, 
  and 
  

   7 
  mm. 
  thick 
  ; 
  the 
  umbilicus 
  is 
  6 
  mm. 
  in 
  diameter. 
  The 
  ribs 
  are 
  

   sharply 
  defined 
  and 
  regular 
  in 
  thickness, 
  having 
  no 
  enlargements 
  or 
  

   tubercles 
  ; 
  they 
  pass 
  outwards 
  from 
  the 
  umbilicus, 
  and 
  in 
  most 
  cases 
  

   bifurcate 
  about 
  the 
  middle 
  of 
  the 
  side, 
  then 
  with 
  a 
  definite 
  flexure 
  

   forwards 
  pass 
  over 
  the 
  back, 
  which 
  is 
  narrow 
  but 
  not 
  sharp. 
  Most 
  

   of 
  the 
  other 
  specimens 
  above 
  noted 
  agree 
  so 
  closely 
  with 
  the 
  one 
  

   just 
  described 
  as 
  to 
  need 
  no 
  further 
  mention, 
  but 
  one 
  of 
  them 
  

   (fig. 
  4) 
  is 
  nearly 
  twice 
  the 
  size 
  (35 
  mm.) 
  and 
  shows 
  that 
  the 
  

   forward 
  flexure 
  of 
  the 
  ribs 
  becomes 
  less 
  marked 
  as 
  the 
  shell 
  grows 
  

   larger. 
  The 
  outer 
  part 
  of 
  this 
  specimen 
  is 
  crushed, 
  so 
  that 
  its 
  form 
  

   is 
  uncertain. 
  

  

  On 
  comparing 
  these 
  ammonites 
  with 
  young 
  examples 
  of 
  A. 
  Tehef- 
  

   Jiini 
  from 
  Russia 
  their 
  agreement 
  is 
  found 
  to 
  be 
  so 
  close 
  that, 
  tor 
  

   the 
  present, 
  they 
  are 
  referred 
  to 
  that 
  species 
  ; 
  but 
  at 
  the 
  same 
  

   time 
  there 
  are 
  small 
  points 
  of 
  difference 
  which 
  leave 
  some 
  doubt. 
  

   None 
  of 
  the 
  Eranz 
  Josef 
  Land 
  specimens 
  are 
  large 
  enough 
  to 
  show 
  

   signs 
  of 
  the 
  lateral 
  expansion 
  which 
  characterizes 
  the 
  adult 
  

   A. 
  Tchefkini, 
  but 
  the 
  largest 
  of 
  them 
  retains 
  the 
  same 
  character 
  

   of 
  the 
  ribs 
  on 
  the 
  outer 
  whorls 
  that 
  it 
  has 
  on 
  the 
  inner 
  whorls 
  — 
  that 
  

   is 
  to 
  say, 
  the 
  ribs 
  merely 
  bifurcate, 
  and 
  consequently 
  those 
  around 
  

  

  