﻿COXrESWOLD, 
  MIDFORD, 
  AND 
  YEOVIL 
  SANDS, 
  ETC. 
  

  

  461 
  

  

  the 
  French 
  localities 
  for 
  comparison. 
  The 
  only 
  observation 
  which 
  I 
  

   have 
  to 
  make 
  upon 
  this 
  Table 
  is 
  that 
  in 
  the 
  first 
  column 
  the 
  " 
  Calcaire 
  

   a 
  Amm. 
  jit 
  rensis" 
  placed 
  below 
  the 
  Bifrons- 
  and 
  Serpentinus-heds, 
  is 
  

   totally 
  at 
  variance 
  with 
  all 
  present 
  knowledge, 
  and 
  is 
  probably 
  an 
  

   error. 
  

  

  The 
  great 
  variation 
  in 
  the 
  lithology 
  of 
  the 
  different 
  localities 
  upon 
  

   the 
  same 
  horizon 
  should 
  be 
  noticed. 
  

  

  I 
  will 
  now 
  proceed 
  to 
  consider 
  the- 
  evidence 
  in 
  favour 
  of 
  the 
  pro- 
  

   posed 
  Toarcian 
  division 
  and 
  will 
  in 
  consequence 
  begin 
  with 
  the 
  

   palaeontological 
  aspects 
  of 
  the 
  case. 
  

  

  The 
  family 
  Hildoceratidse 
  dominate 
  this 
  period. 
  They 
  appear 
  

   suddenly 
  with 
  the 
  Falcife 
  rum-zone, 
  and 
  die 
  out 
  abruptly 
  with 
  the 
  

   exit 
  of 
  the 
  Concavum-be&s. 
  Prior 
  to 
  the 
  former, 
  or 
  subsequent 
  to 
  

   the 
  latter, 
  only 
  a 
  very 
  few 
  species 
  are 
  found. 
  The 
  annexed 
  Table 
  

   of 
  the 
  range 
  of 
  the 
  species 
  and 
  genera 
  of 
  the 
  family 
  Hildoceratidye 
  

   will 
  fully 
  bear 
  out 
  these 
  remarks. 
  

  

  Table 
  Il.f 
  

  

  Family 
  Hildoceratidje. 
  

  

  Hildoceras 
  

  

  bifrons 
  (Brug.) 
  

  

  Levisoni 
  (Simps.) 
  

  

  Frantzi 
  (Beynes) 
  

  

  Douvillei 
  (Haug) 
  

  

  Xiliani, 
  Haug 
  

  

  boreale 
  ( 
  Seebach) 
  

  

  serpentinum 
  (Beinecke) 
  .. 
  

   Lillia 
  

  

  comensis 
  (Buck) 
  

  

  tirolensis 
  (Hauer) 
  

  

  Lilli 
  (Hauer) 
  

  

  erbaensis 
  (Hauer) 
  

  

  fH 
  5! 
  

  

  i^ 
  

  

  C>Ri 
  

  

  * 
  * 
  * 
  

  

  x 
  

  

  t 
  For 
  information 
  concerning 
  the 
  position 
  of 
  many 
  of 
  these 
  species 
  (especi- 
  

   ally 
  those 
  of 
  older 
  authors), 
  I 
  must 
  acknowledge 
  myself 
  indebted 
  to 
  Dr. 
  Haug's 
  

   memoir 
  on 
  Harpoceras: 
  Neues 
  Jahrbuch 
  fur 
  Mineralogie 
  &c. 
  Beil. 
  Bd. 
  iii. 
  1885. 
  

  

  Many 
  of 
  Duinor 
  tier's 
  species 
  are 
  given 
  by 
  him 
  as 
  from 
  the 
  zone 
  of 
  Amm. 
  

   bifrons 
  (= 
  Commune- 
  and 
  Jurense-zones 
  above). 
  In 
  such 
  cases 
  I 
  have 
  referred 
  

   the 
  species 
  to 
  the 
  Commune-zone, 
  unless 
  I 
  had 
  knowledge 
  or 
  evidence 
  to 
  the 
  

   contrary. 
  

  

  The 
  zone 
  of 
  Amm. 
  Parkinsoni 
  does 
  not, 
  to 
  my 
  knowledge, 
  contain 
  any 
  

   species 
  belonging 
  to 
  this 
  family 
  ; 
  but 
  certain 
  members 
  thereof 
  (descendants 
  of 
  

   the 
  genus 
  Ludwigia) 
  occur 
  in 
  the 
  strata 
  above. 
  Other 
  species 
  in 
  the 
  same 
  

   horizon 
  perhaps 
  belong 
  to 
  this 
  family 
  ; 
  but 
  at 
  present 
  we 
  are 
  only 
  concerned 
  

   with 
  those 
  in 
  the 
  zones 
  here 
  given. 
  

  

  