﻿I96 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  of 
  Minchinhampton. 
  Only 
  one 
  genus 
  with 
  one 
  species 
  unites 
  the 
  

   Puller's 
  Earth 
  to 
  the 
  true 
  Great 
  Oolite, 
  and 
  only 
  16 
  genera 
  and 
  

   31 
  species 
  pass 
  to 
  the 
  Forest 
  Marble, 
  and 
  14 
  to 
  the 
  Cornbrash 
  out 
  

   of 
  the 
  247 
  ; 
  so 
  that 
  the 
  Great-Oolite 
  Univalve 
  fauna 
  is 
  distinctive 
  

   and 
  characteristic. 
  

  

  Cephalopoda. 
  Ammonites. 
  — 
  Seven 
  species 
  occur, 
  and 
  six 
  of 
  these 
  

   are 
  peculiar 
  ; 
  they 
  are 
  Am. 
  arbustigerus, 
  Am. 
  discus, 
  Am. 
  gracilis, 
  

   Am. 
  micromphalus, 
  Am. 
  Morrisii, 
  Am. 
  subcontractus, 
  and 
  Am. 
  Water- 
  

   housii 
  ; 
  all 
  but 
  Am. 
  discus, 
  which 
  passes 
  to 
  the 
  Cornbrash, 
  are 
  con- 
  

   fined 
  to 
  the 
  horizon 
  of 
  the 
  Great 
  Oolite. 
  

  

  Nautili. 
  — 
  N. 
  Baberi, 
  N. 
  dispansus, 
  andi\ 
  7 
  . 
  subcontractus 
  are 
  essen- 
  

   tially 
  Great 
  Oolite, 
  and 
  all 
  that 
  are 
  known. 
  

  

  Belemnites. 
  — 
  B. 
  aripistillum, 
  B. 
  Bessinus, 
  and 
  B. 
  spinatus 
  are 
  all 
  

   that 
  are 
  known; 
  the 
  two 
  first 
  named 
  are 
  confined 
  to 
  the 
  Great 
  

   Oolite. 
  

  

  Teuihidae. 
  — 
  None. 
  

  

  Pisces. 
  — 
  20 
  genera 
  and 
  58 
  species 
  occur, 
  and 
  all 
  except 
  two 
  are 
  

   peculiar. 
  The 
  exceptions 
  are 
  Strophodus 
  magnus 
  and 
  S. 
  tenuis, 
  

   which 
  occur 
  in 
  and 
  come 
  up 
  from 
  the 
  Inferior 
  Oolite 
  : 
  so 
  that 
  56 
  

   species 
  commence 
  in 
  and 
  are 
  confined 
  to 
  this 
  horizon. 
  I 
  give 
  the 
  

   genera 
  and 
  number 
  of 
  species 
  as 
  follows 
  : 
  — 
  

  

  Acrodus 
  2 
  species. 
  

  

  Amblyurus 
  1 
  „ 
  

  

  Aster 
  acanthus 
  2 
  „ 
  

  

  Belonostomus 
  2 
  „ 
  

  

  Caturus 
  1 
  „ 
  

  

  Ceratodus 
  1 
  „ 
  

  

  Ctenolepis 
  1 
  „ 
  

  

  Ganodus 
  10 
  ,, 
  

  

  Gyrodus 
  2 
  „ 
  

  

  Hybodus 
  8 
  „ 
  

  

  Lepidotus 
  2 
  „ 
  

  

  Leptacanthus 
  2 
  „ 
  

  

  Nemacanthus 
  2 
  „ 
  

  

  Pholidophorus 
  2 
  „ 
  

  

  Pristacanthus 
  1 
  ,, 
  

  

  Pycnodus 
  12 
  „ 
  

  

  Sauropsis 
  1 
  „ 
  

  

  Scaphodus 
  1 
  „ 
  

  

  Sphenonchus 
  1 
  „ 
  

  

  Strophodus 
  4 
  „ 
  

  

  58 
  „ 
  

  

  The 
  Hybodonts, 
  Pycnodonts, 
  and 
  Ganoidei 
  are 
  numerically 
  the 
  richest 
  

   in 
  genera. 
  The 
  only 
  known 
  species 
  occurring 
  in 
  the 
  Porest 
  Marble 
  

   is 
  Aster 
  acanthus 
  Stutchburii, 
  a 
  species 
  long 
  believed 
  to 
  belong 
  to 
  the 
  

   Lias. 
  I 
  am 
  not 
  aware 
  of 
  any 
  Pycnodonts, 
  Hybodonts, 
  or 
  Strophodonts 
  

   occurring 
  in 
  the 
  Porest 
  Marble. 
  The 
  Cornbrash 
  has 
  yielded 
  Astera- 
  

   canthus 
  acutus 
  and 
  Isodius 
  leptognatkus 
  ; 
  I 
  know 
  of 
  no 
  other 
  forms. 
  

  

  