﻿axxiveesaey 
  addeess 
  of 
  the 
  peesidext. 
  1 
  89 
  

  

  § 
  5. 
  Fttllee's 
  Eaeth. 
  

  

  Only 
  51 
  genera 
  and 
  110 
  species 
  occur 
  in 
  this 
  division 
  of 
  the 
  

   Lower 
  Oolites. 
  Seeing 
  that 
  35 
  of 
  the 
  51 
  genera 
  and 
  6d 
  of 
  the 
  110 
  

   species 
  were 
  derived 
  from 
  the 
  Inferior 
  Oolite, 
  and 
  that 
  80 
  per 
  cent, 
  

   of 
  the 
  species 
  occurring 
  are 
  also 
  common 
  to 
  the 
  succeeding 
  Great 
  

   Oolite, 
  this 
  division 
  has 
  no 
  value, 
  save 
  on 
  physical 
  grounds, 
  and 
  this 
  

   only 
  over 
  a 
  very 
  limited 
  area 
  ; 
  for 
  the 
  Fuller's 
  Earth 
  is 
  by 
  no 
  means 
  

   universal 
  or 
  even 
  general 
  in 
  its 
  distribution. 
  No 
  Plantie, 
  Amorphozoa, 
  

   Crustacea, 
  Nautili, 
  Teuthidse, 
  or 
  Reptilia 
  occur, 
  *. 
  e. 
  9 
  of 
  the 
  19 
  

   classes 
  are 
  unrepresented 
  ; 
  only 
  4 
  species 
  of 
  Corals, 
  3 
  Bryozoa, 
  one 
  

   Gasteropod, 
  3 
  species 
  of 
  Belemnites, 
  and 
  5 
  species 
  of 
  Ammonites 
  are 
  

   known. 
  The 
  value, 
  therefore, 
  of 
  the 
  Fuller's 
  Earth 
  as 
  a 
  life-group 
  is 
  

   almost 
  nil 
  ; 
  it 
  is 
  only 
  through 
  the 
  Echinodermata 
  and 
  the 
  Lamelli- 
  

   branchiata 
  that 
  it 
  has 
  position 
  ; 
  and 
  50 
  per 
  cent, 
  of 
  these 
  came 
  from 
  

   the 
  Inferior 
  Oolite. 
  The 
  Fuller's 
  Earth 
  is 
  an 
  extremely 
  local 
  for- 
  

   mation, 
  the 
  Stroud 
  valley 
  near 
  Gloucester 
  and 
  Bath 
  being 
  the 
  only 
  

   places 
  where 
  it 
  is 
  extensively 
  developed 
  as 
  a 
  purely 
  argillaceous 
  

   deposit 
  ; 
  in 
  Somersetshire 
  it 
  merges 
  on 
  its 
  strike 
  into 
  a 
  calcareous 
  

   deposit 
  termed 
  the 
  " 
  Fullers-earth 
  Bock," 
  which, 
  however, 
  is 
  little 
  

   richer 
  in 
  fossils 
  than 
  the 
  argillaceous 
  type. 
  

  

  Plasty. 
  — 
  None. 
  

  

  Amoephozoa. 
  — 
  None. 
  

  

  Ccelenteeata. 
  — 
  Only 
  2 
  genera 
  and 
  4 
  species 
  known; 
  they 
  are 
  

   Anabacia 
  hemisplicerica 
  ', 
  Monilivaltia 
  Delabechei, 
  M. 
  tenuilamellosa. 
  

   and 
  M. 
  W 
  right 
  ii. 
  

  

  Echixodeezuata. 
  — 
  Out 
  of 
  the 
  8 
  genera 
  and 
  11 
  species 
  occurring, 
  

   7 
  genera 
  and 
  10 
  species 
  came 
  from 
  the 
  Inferior 
  Oolite, 
  leaving 
  only 
  

   one 
  genus 
  and 
  one 
  species 
  as 
  truly 
  belonging 
  to 
  the 
  Fuller's 
  Earth, 
  

   viz. 
  Py 
  gurus 
  Jlichelini, 
  which 
  ranges 
  up 
  to 
  the 
  Cornbrash. 
  Acrosa- 
  

   Jenia 
  spinosa, 
  Chjpeus 
  Prattii, 
  and 
  Py 
  gurus 
  Miclielini 
  pass 
  to 
  the 
  

   Great 
  Oolite, 
  the 
  same 
  3 
  species 
  to 
  the 
  Forest 
  Marble, 
  and 
  2 
  to 
  the 
  

   Cornbrash. 
  

  

  Axxelida. 
  — 
  Only 
  Serpula 
  triangulata, 
  S. 
  laevigata, 
  and 
  S. 
  trica- 
  

   rinata 
  occur 
  ; 
  the 
  first 
  two 
  pass 
  to 
  the 
  Great 
  Oolite. 
  

  

  Cetjst 
  acea. 
  — 
  None 
  . 
  

  

  Betozoa. 
  — 
  Diastopora 
  cricopora, 
  D. 
  oolitica,an& 
  Terehellaria 
  ramo- 
  

   sissima 
  constitute 
  the 
  Bryozoan 
  fauna. 
  These 
  same 
  species 
  pass 
  to 
  

   the 
  Great 
  Oolite, 
  in 
  which 
  division 
  there 
  are 
  16 
  genera 
  and 
  31 
  

   known 
  species 
  ; 
  few 
  are 
  known 
  or 
  described 
  above 
  the 
  Great 
  Oolite. 
  

   The 
  whole 
  known 
  Bryozoan 
  fauna 
  of 
  the 
  Jurassic 
  rocks 
  includes 
  

   19 
  genera 
  and 
  51 
  species. 
  

  

  Beachiopoda. 
  — 
  Only 
  4 
  genera 
  and 
  14 
  species 
  occur 
  in 
  this 
  argil- 
  

   laceous 
  deposit. 
  The 
  genus 
  Terebratula 
  has 
  yielded 
  5 
  species, 
  

   Waldheimia 
  4, 
  Rhynclionella 
  4, 
  and 
  Thecidium 
  one 
  ; 
  4 
  genera 
  and 
  

   7 
  species 
  pass 
  to 
  the 
  Great 
  Oolite. 
  

  

  Lamellibeaxchiata. 
  — 
  Monomyaria. 
  — 
  More 
  than 
  50 
  per 
  cent, 
  of 
  

   this 
  group 
  of 
  the 
  Bivalvia 
  pass 
  up 
  from 
  the 
  Inferior 
  Oolite 
  : 
  for 
  out 
  

   of 
  the 
  9 
  genera 
  and 
  15 
  species 
  occurring, 
  genera 
  and 
  8 
  species 
  

   are 
  common 
  to 
  the 
  two 
  formations 
  ; 
  and 
  a 
  large 
  series 
  pass 
  up 
  to 
  

   the 
  Great 
  Oolite 
  &c. 
  

  

  