﻿500 
  MESSES. 
  E. 
  T. 
  NEWTON 
  AND 
  J. 
  J. 
  H. 
  TEALL 
  ON 
  [Dec. 
  1897? 
  

  

  4. 
  Windy 
  Gully. 
  

  

  The 
  next 
  exposure 
  of 
  rock 
  to 
  be 
  noticed 
  is 
  that 
  which 
  was 
  

   found 
  at 
  the 
  southern 
  end 
  of 
  Windy 
  Gully, 
  a 
  valley 
  north-east 
  of 
  

   Elmwood, 
  running 
  nearly 
  north 
  and 
  south. 
  Near 
  the 
  southern 
  

   end 
  of 
  this 
  valley 
  there 
  is 
  a 
  projecting 
  shoulder 
  of 
  rock, 
  and 
  on 
  

   this, 
  at 
  a 
  height 
  above 
  the 
  sea 
  of 
  about 
  300 
  feet, 
  1 
  a 
  number 
  

   of 
  fossils 
  were 
  obtained, 
  nearly 
  all 
  of 
  them 
  being 
  in 
  hard 
  

   concretions 
  or 
  in 
  phosphatic 
  nodules. 
  Dr. 
  Koettlitz 
  is 
  satisfied 
  that 
  

   they 
  were 
  in 
  situ 
  : 
  but 
  even 
  if 
  not 
  actually 
  in 
  place, 
  they 
  could 
  

   only 
  have 
  been 
  weathered 
  out 
  of 
  the 
  rock 
  on 
  which 
  they 
  rested. 
  

  

  These 
  beds 
  seem 
  to 
  be 
  lower 
  in 
  the 
  series 
  than 
  those 
  of 
  No. 
  3, 
  

   unless 
  the 
  strata 
  are 
  less 
  horizontal 
  than 
  we 
  understand 
  them 
  to 
  

   be, 
  and 
  they 
  have 
  yielded 
  a 
  different 
  set 
  of 
  fossils 
  ; 
  the 
  most 
  striking 
  

   of 
  these 
  are 
  some 
  ammonites 
  which 
  are 
  believed 
  to 
  be 
  varieties 
  of 
  

   A 
  . 
  Islimce, 
  a 
  species 
  described 
  by 
  Keyserling 
  from 
  Ishma 
  in 
  Petchora 
  

   Land. 
  

  

  Ammonites 
  (Macbocephalites) 
  Isidoe, 
  Keys., 
  var. 
  akcticus. 
  

   (PI. 
  XL.) 
  

  

  Several 
  examples 
  of 
  this 
  ammonite 
  were 
  found, 
  but 
  they 
  vary 
  

   somewhat 
  in 
  form. 
  The 
  most 
  typical 
  specimen 
  is 
  also 
  the 
  most 
  

   perfect 
  (PI. 
  XL, 
  fig. 
  1) 
  ; 
  it 
  is 
  about 
  2| 
  inches 
  in 
  diameter, 
  and 
  

   its 
  greatest 
  thickness 
  measures 
  1| 
  inch. 
  The 
  ribs, 
  which 
  are 
  

   sharply 
  defined, 
  pass 
  outwards, 
  with 
  a 
  distinct 
  inclination 
  forwards. 
  

   At 
  a 
  distance 
  from 
  the 
  umbilicus 
  of 
  about 
  one-third 
  the 
  height 
  of 
  

   the 
  whorl, 
  the 
  ribs 
  bifurcate, 
  and 
  then 
  pass 
  over 
  the 
  back. 
  Occa- 
  

   sionally 
  there 
  is 
  a 
  single 
  rib 
  interposed. 
  The 
  umbilicus 
  is 
  very 
  

   small, 
  less 
  indeed 
  than 
  is 
  usually 
  the 
  case 
  in 
  A. 
  macrocephalus, 
  

   although 
  it 
  is 
  equally 
  small 
  in 
  some 
  specimens 
  that 
  have 
  been 
  

   referred 
  to 
  the 
  latter 
  species. 
  In 
  nearly 
  all 
  the 
  above 
  points 
  our 
  

   specimen 
  resembles 
  A. 
  macrocephalus, 
  but 
  on 
  closer 
  examination 
  

   it 
  is 
  found 
  that 
  the 
  whorls 
  do 
  not 
  increase 
  so 
  rapidly, 
  and 
  as 
  at 
  

   the 
  same 
  time 
  they 
  are 
  more 
  involute, 
  the 
  outer 
  whorls 
  are 
  much 
  

   more 
  encroached 
  upon 
  by 
  the 
  whorl 
  which 
  precedes 
  it; 
  so 
  that 
  

   while 
  in 
  A. 
  macroceplialus 
  the 
  last 
  whorl 
  is 
  encroached 
  upon 
  for 
  

   less 
  than 
  half 
  its 
  height, 
  in 
  the 
  present 
  form 
  the 
  encroachment 
  is 
  

   always 
  more 
  than 
  half 
  the 
  height, 
  thus 
  indicating 
  a 
  different 
  mode 
  

   of 
  growth. 
  And 
  further, 
  the 
  sides 
  of 
  this 
  species 
  are 
  less 
  inflated 
  

   around 
  the 
  umbilicus, 
  and 
  more 
  so 
  towards 
  the 
  back, 
  so 
  that 
  the 
  

   entire 
  shell 
  has 
  a 
  different 
  aspect. 
  

  

  If 
  this 
  specimen 
  be 
  compared 
  with 
  Keyserling's 
  figure 
  of 
  

   A. 
  Islimce 
  from 
  Petchora 
  Land, 
  2 
  it 
  will 
  be 
  seen 
  that 
  in 
  most 
  of 
  

   those 
  points 
  in 
  which 
  our 
  specimen 
  differs 
  from 
  A. 
  macroceplialus 
  it 
  

   approaches 
  A, 
  Islimce 
  ; 
  but 
  at 
  the 
  same 
  time 
  the 
  inner 
  whorl 
  of 
  

   Islimce 
  does 
  not 
  encroach 
  so 
  much 
  upon 
  the 
  outer 
  one 
  as 
  is 
  the 
  

   case 
  in 
  the 
  Arctic 
  specimen. 
  This 
  encroachment 
  of 
  the 
  whorls, 
  

   involving, 
  as 
  it 
  does, 
  a 
  different 
  growth 
  of 
  the 
  shell, 
  may 
  perhaps 
  be 
  

   thought 
  sufficient 
  for 
  the 
  establishment 
  of 
  a 
  new 
  species, 
  and 
  if 
  so 
  

  

  1 
  [Dr. 
  Koettlitz 
  says 
  ' 
  over 
  400 
  feet.'] 
  

  

  2 
  ' 
  Eeise 
  in 
  das 
  Petschora-Land,' 
  1846, 
  p. 
  331, 
  pi. 
  xx. 
  figs. 
  8 
  & 
  9. 
  

  

  