﻿i 
  7 
  8 
  

  

  rKOCEEDIXGS 
  OP 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  of 
  England 
  are 
  rich 
  in 
  Isastrcece 
  and 
  Thamnastrcece. 
  The 
  Coral 
  

   fauna 
  of 
  the 
  Inferior 
  Oolite, 
  next 
  to 
  the 
  Lower 
  Lias, 
  is 
  the 
  

   richest 
  in 
  species 
  in 
  the 
  Jurassic 
  rocks. 
  The 
  Lower 
  Lias 
  has 
  yielded 
  

   13 
  genera 
  and 
  72 
  species, 
  and 
  the 
  Inferior 
  Oolite 
  19 
  genera 
  and 
  48 
  

   species, 
  and 
  not 
  one 
  in 
  common. 
  

  

  The 
  following 
  Table 
  (XXVIII.) 
  expresses 
  the 
  numerical 
  distribu- 
  

   tion 
  of 
  the 
  Jurassic 
  Actinozoa, 
  from 
  those 
  horizons 
  above 
  the 
  Lias. 
  

  

  Table 
  XXVIII. 
  

  

  

  

  

  

  

  

  

  

  

  £» 
  

  

  

  

  

  x, 
  

  

  

  CD 
  

  

  

  o 
  

  

  o 
  

  

  

  

  J5 
  

  

  5 
  

  

  J 
  

  

  

  'o 
  

  

  c5 
  

  

  £ 
  

  

  | 
  

  

  

  « 
  

  

  §> 
  

  

  o 
  

   O 
  

  

  bo 
  

  

  o 
  

  

  o 
  

  

  

  O 
  

   u 
  

  

  DD 
  

  

  o 
  

   O 
  

  

  CD 
  

  

  CO 
  

  

  a 
  

  

  1 
  

  

  t-i 
  

  

  «2 
  

  

  1 
  

  

  CD 
  

  

  a 
  

  

  R 
  

  

  T3 
  

  

  

  

  

  1—1 
  

  

  = 
  

  

  

  O 
  

  

  o 
  

  

  L^ 
  

  

  H 
  

  

  o 
  

  

  

  o 
  

  

  

  r 
  ^ 
  

  

  o 
  

  

  ^ 
  

  

  O 
  

  

  w 
  

  

  O 
  

  

  O 
  

  

  M 
  

  

  PM 
  

  

  Genera 
  

  

  19 
  

  

  48 
  

  

  2 
  

  

  4 
  

  

  15 
  

  

  38 
  

  

  1 
  

   1 
  

  

  1 
  

   1 
  

  

  

  

  10 
  

   14 
  

  

  

  1 
  

   1 
  

  

  Species 
  

  

  

  Echtnopeemata. 
  — 
  In 
  the 
  whole 
  of 
  the 
  Jurassic 
  rocks, 
  including 
  

   the 
  Lias, 
  there 
  are 
  47 
  genera 
  and 
  216 
  species. 
  The 
  Inferior 
  Oolite 
  

   contains 
  22 
  genera 
  and 
  51 
  species, 
  7 
  genera 
  and 
  10 
  species 
  of 
  

   which 
  pass 
  to 
  the 
  Fuller's 
  Earth, 
  8 
  genera 
  and 
  11 
  species 
  to 
  the 
  

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

   genera 
  and 
  5 
  species 
  to 
  the 
  Cornbrash. 
  The 
  whole 
  Jurassic 
  rocks 
  

   yield 
  9 
  genera 
  and 
  37 
  species 
  of 
  Crinoidea 
  ; 
  14 
  genera 
  and 
  35 
  species 
  

   of 
  Asteroidea; 
  of 
  the 
  Echinoidea, 
  group 
  Endocyclica 
  (or 
  Regular 
  

   Echinoidea), 
  12 
  gonera 
  and 
  92 
  species 
  ; 
  and 
  of 
  the 
  Exocyclica 
  (or 
  

   Irregular 
  Echinoidea) 
  7 
  genera 
  and 
  37 
  species. 
  

  

  Crinoidea. 
  — 
  Only 
  2 
  species 
  of 
  the 
  known 
  37 
  occur 
  in 
  the 
  Inferior 
  

   Oolite 
  ; 
  they 
  are 
  Pentacrinus 
  Milleri 
  and 
  P. 
  Austenii. 
  

  

  Asteroidea. 
  — 
  Astropecten 
  with 
  3 
  species, 
  Goniaster 
  with 
  2, 
  

   Solaster 
  and 
  Stellaster 
  each 
  with 
  one 
  species, 
  comprise 
  the 
  whole 
  of 
  

   the 
  Starfishes 
  of 
  the 
  Inferior 
  Oolite. 
  Thus 
  only 
  7 
  out 
  of 
  the 
  35 
  

   Jurassic 
  forms 
  have 
  been 
  found 
  in 
  this 
  horizon. 
  

  

  Echinoidea. 
  — 
  17 
  genera 
  and 
  40 
  species 
  out 
  of 
  the 
  129 
  known 
  

   Jurassic 
  species 
  occur 
  in 
  the 
  Inferior 
  Oolite. 
  11 
  of 
  the 
  genera 
  and 
  

   25 
  species 
  belong 
  to 
  the 
  group 
  Endocyclica, 
  and 
  6 
  genera 
  and 
  15 
  

   species 
  to 
  the 
  Exocyclica. 
  These 
  2 
  groups, 
  with 
  the 
  Crinoidea 
  and 
  

   Asteroidea, 
  are 
  extremely 
  important 
  stratigraphically 
  ; 
  their 
  ranges 
  

   are 
  restricted, 
  and 
  the 
  species 
  afford 
  the 
  safest 
  clue 
  for 
  the 
  purposes 
  

   of 
  stratigraphical 
  correlation. 
  The 
  accompanying 
  Table 
  (XXIX.) 
  

   shows 
  the 
  numerical 
  history 
  of 
  the 
  known 
  Echinodermal 
  fauna 
  

   from 
  the 
  Lower 
  Lias 
  to 
  the 
  close 
  of 
  the 
  Inferior 
  Oolite. 
  The 
  first 
  

   column 
  contains 
  the 
  genera, 
  and 
  the 
  second 
  column 
  the 
  number 
  of 
  

   species 
  in 
  the 
  Jurassic 
  rocks, 
  followed 
  by 
  their 
  value 
  in 
  the 
  Lower, 
  

   Middle, 
  and 
  Upper 
  Lias, 
  and 
  Inferior 
  Oolite. 
  

  

  