﻿Hi 
  PKOCEEDLNGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  precise 
  percentages 
  of 
  the 
  forms 
  of 
  passage, 
  I 
  must, 
  for 
  want 
  of 
  timo, 
  

   content 
  myself 
  with 
  treating 
  the 
  Inferior 
  Oolite 
  as 
  a 
  whole. 
  

  

  Leaving 
  therefore 
  the 
  details 
  of 
  the 
  Inferior 
  Oolite, 
  I 
  shall 
  now 
  

   proceed 
  to 
  the 
  larger 
  subject 
  of 
  the 
  numerical 
  relations 
  to 
  each 
  other 
  

   of 
  the 
  fossils 
  of 
  the 
  different 
  formations 
  into 
  which 
  the 
  Oolitic 
  strata 
  

   have 
  been 
  divided, 
  by 
  the 
  help 
  of 
  Table 
  III., 
  in 
  which 
  the 
  numbers 
  

   marked 
  in 
  the 
  columns 
  devoted 
  to 
  the 
  "known, 
  new, 
  and 
  peculiar 
  

   species 
  represent 
  my 
  method 
  of 
  analyzing 
  a 
  series 
  of 
  other 
  tables 
  

   already 
  alluded 
  to 
  as 
  having 
  been 
  constructed 
  by 
  Mr. 
  Etheridge, 
  in 
  

   which 
  the 
  range 
  of 
  every 
  known 
  British 
  species 
  in 
  the 
  Oolitic 
  rocks 
  

   has 
  been 
  carefully 
  laid 
  down. 
  

  

  For 
  the 
  purpose 
  in 
  view 
  I 
  have 
  placed 
  the 
  different 
  formations 
  in 
  

   serial 
  order, 
  beginning 
  with 
  the 
  Inferior 
  Oolite 
  or 
  lowest 
  member 
  

   on 
  the 
  left. 
  I 
  have 
  then 
  assigned 
  to 
  each 
  formation 
  four 
  lines, 
  

   showing 
  the 
  number 
  of 
  peculiar, 
  new, 
  known, 
  and 
  inferred 
  species 
  of 
  

   Bracliiopoda, 
  Gasteropoda, 
  Cephalopoda, 
  and 
  so 
  on, 
  that 
  belong 
  to 
  

   each 
  British 
  formation, 
  together 
  with 
  columns 
  showing 
  the 
  num- 
  

   bers 
  of 
  new, 
  known, 
  and 
  inferred, 
  species 
  that 
  pass 
  upwards 
  and 
  down- 
  

   wards 
  from 
  one 
  formation 
  to 
  another. 
  By 
  inferred 
  species 
  I 
  strictly 
  

   mean 
  species 
  which, 
  though 
  they 
  have 
  not 
  been 
  observed 
  in 
  some 
  one 
  

   given 
  formation, 
  yet 
  must 
  have 
  lived 
  during 
  the 
  period 
  represented 
  by 
  

   that 
  formation 
  in 
  some 
  region 
  or 
  other, 
  because 
  they 
  are 
  found 
  in 
  for- 
  

   mations 
  both 
  below 
  and 
  above. 
  Thus 
  there 
  are 
  51 
  known 
  species 
  of 
  

   Echinodermata 
  occurring 
  in 
  the 
  Inferior 
  Oolite, 
  19 
  of 
  which 
  pass 
  

   upwards 
  into 
  higher 
  formations. 
  But 
  only 
  one 
  species 
  is 
  known 
  in 
  the 
  

   Fuller's 
  Earth 
  ; 
  and 
  the 
  remaining 
  18, 
  occurring 
  in 
  the 
  Great 
  Oolite 
  or 
  

   in 
  other 
  higher 
  formations, 
  must 
  have 
  lived 
  somewhere 
  or 
  other 
  

   during 
  the 
  deposition 
  of 
  the 
  Fuller's 
  Earth. 
  I 
  therefore 
  call 
  the 
  18 
  

   species 
  inferred, 
  and 
  add 
  to 
  the 
  actually 
  inferred 
  number 
  the 
  num- 
  

   ber 
  known 
  in 
  the 
  formation, 
  thus 
  getting 
  at 
  the 
  number 
  of 
  British 
  

   forms 
  known 
  to 
  have 
  lived 
  during 
  the 
  deposition 
  of 
  the 
  Fuller's 
  

   Earth 
  ; 
  and 
  for 
  the 
  sake 
  of 
  brevity 
  in 
  the 
  tables 
  the 
  inferred 
  number 
  

   added 
  to 
  the 
  new 
  species 
  are 
  included 
  in 
  one 
  of 
  the 
  lines 
  under 
  the 
  

   term 
  " 
  inferred." 
  A 
  little 
  reflection 
  will 
  show 
  that 
  this 
  method 
  is 
  

   necessary 
  in 
  order 
  to 
  prove 
  the 
  connexion 
  in 
  fossils 
  of 
  the 
  different 
  

   formations 
  with 
  each 
  other 
  as 
  a 
  whole, 
  while 
  at 
  the 
  same 
  time 
  every 
  

   other 
  detail 
  is 
  given 
  as 
  to 
  known, 
  new, 
  and 
  peculiar 
  species, 
  so 
  as 
  to 
  

   render 
  the 
  table 
  as 
  complete 
  as 
  possible. 
  In 
  a 
  subsequent 
  Table, 
  

   No. 
  IV., 
  a 
  summary 
  is 
  given 
  of 
  the 
  chief 
  results 
  that 
  may 
  be 
  inferred 
  

   from 
  the 
  data 
  supplied 
  in 
  No. 
  III. 
  

  

  From 
  the 
  data 
  given 
  in 
  the 
  Table, 
  the 
  first 
  point 
  that 
  strikes 
  us 
  is, 
  

   that, 
  eliminating 
  the 
  Plants, 
  there 
  are 
  known 
  at 
  present 
  in 
  all 
  the 
  

   Oolitic 
  formations 
  242 
  genera 
  and 
  1483 
  species. 
  Of 
  these, 
  1169 
  spe- 
  

   cies 
  (more 
  than 
  |ths 
  of 
  the 
  whole) 
  lie 
  in 
  the 
  lower 
  Oolites, 
  322 
  species 
  

   in 
  the 
  middle, 
  and 
  only 
  82 
  species 
  in 
  the 
  upper 
  formations. 
  Further, 
  

   beginning 
  in 
  the 
  Inferior 
  Oolite 
  with 
  472 
  species, 
  the 
  number 
  cul- 
  

   minates 
  in 
  the 
  Great 
  Oolite 
  to 
  718 
  species, 
  after 
  which 
  it 
  at 
  once 
  de- 
  

   clines, 
  and 
  ranges 
  in 
  the 
  different 
  formations 
  from 
  178 
  down 
  to 
  31 
  

   species. 
  Of 
  the 
  471 
  species 
  in 
  the 
  Inferior 
  Oolite 
  only 
  13 
  pass 
  up 
  

   from 
  the 
  Upper 
  Lias. 
  

  

  