﻿202 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  this 
  horizon, 
  mostly 
  from 
  the 
  counties 
  of 
  Gloucester, 
  Somerset, 
  and 
  

   Dorset. 
  16 
  genera 
  and 
  31 
  species 
  pass 
  from 
  the 
  Great 
  Oolite 
  and 
  

   unite 
  the 
  two 
  subformations 
  ; 
  but 
  only 
  2 
  species, 
  Patella 
  cingulata 
  

   and 
  Actceonina 
  Luidii, 
  pass 
  to 
  the 
  succeeding 
  Cornbrash 
  ; 
  none 
  to 
  

   the 
  Kellaways 
  Bock. 
  41 
  species 
  of 
  the 
  Gasteropoda, 
  therefore, 
  do 
  

   not 
  range 
  beyond 
  the 
  Forest 
  Marble 
  ; 
  overlapping 
  forms 
  from 
  the 
  

   Great 
  Oolite 
  to 
  the 
  Cornbrash, 
  and 
  not 
  appearing 
  in 
  the 
  Forest 
  

   Marble, 
  number 
  9 
  genera 
  and 
  14 
  species. 
  No 
  genus 
  out 
  of 
  the 
  

  

  19 
  occurring 
  in 
  this 
  group 
  possesses 
  more 
  than 
  4 
  species, 
  and 
  10 
  

   only 
  1. 
  The 
  same 
  paucity 
  occurs 
  in 
  the 
  Lamellibranchiata. 
  

  

  Cephalopoda. 
  Ammonites. 
  — 
  Ammonites 
  Herveyi 
  is 
  the 
  only 
  species 
  

   really 
  known 
  in 
  the 
  Forest 
  Marble, 
  and 
  this 
  species 
  also 
  occurs 
  in 
  

   the 
  Cornbrash. 
  Am. 
  radisensis, 
  D'Orb., 
  is 
  doubtfully 
  referred 
  to 
  the 
  

   Forest 
  Marble. 
  

  

  Nautili. 
  — 
  None 
  known. 
  

  

  Belemnites. 
  — 
  None 
  known. 
  

  

  Pisces. 
  — 
  Asteracanthus 
  Stutchburii, 
  erroneously 
  placed 
  for 
  many 
  

   years 
  in 
  the 
  Lower 
  Lias. 
  

  

  Reptilia. 
  — 
  Bothriospondylus 
  robustus 
  and 
  remains 
  of 
  Strepto- 
  

   spondylus, 
  belonging 
  to 
  the 
  Crocodilia, 
  and 
  the 
  Dinosaur 
  Megalo- 
  

   saurus 
  BucMandi 
  comprise 
  all 
  we 
  know 
  of 
  the 
  Eeptilia 
  in 
  the 
  

   Forest 
  Marble. 
  

  

  Mammalia. 
  — 
  None 
  known. 
  

  

  For 
  the 
  Analysis 
  of 
  the 
  Forest-Marble 
  species, 
  see 
  Table 
  XXXIV. 
  

   page 
  203. 
  

  

  § 
  8. 
  Cornbrash. 
  

  

  This 
  uppermost 
  horizon 
  of 
  the 
  Lower 
  Oolite 
  is 
  rich 
  only 
  in 
  the 
  

   Echinodermata, 
  Lamellibranchiata, 
  and 
  Gasteropoda. 
  

  

  Plantje. 
  — 
  None 
  known. 
  

  

  Amorphozoa. 
  — 
  None 
  known. 
  

  

  Cgslenterata. 
  — 
  Anabacia 
  orbulites, 
  one 
  of 
  the 
  Fungidae, 
  is 
  the 
  

   only 
  species 
  known 
  to 
  occur 
  in 
  the 
  Cornbrash. 
  This 
  species 
  ranges 
  

   from 
  the 
  Inferior 
  Oolite 
  direct 
  to 
  the 
  Cornbrash. 
  

  

  Echinodermata. 
  — 
  12 
  genera 
  and 
  23 
  species 
  may 
  be 
  said 
  to 
  range 
  

   through 
  England, 
  the 
  persistency 
  of 
  the 
  Cornbrash 
  from 
  Dorsetshire 
  

   to 
  Yorkshire 
  being 
  such 
  as 
  to 
  render 
  it 
  a 
  continuous 
  band, 
  never 
  

   many 
  feet 
  in 
  thickness 
  anywhere. 
  The 
  12 
  genera 
  are 
  sparingly 
  repre- 
  

   sented. 
  With 
  the 
  exception 
  of 
  the 
  Asteroid 
  Ophiurella 
  Griesbachii, 
  

   the 
  whole 
  of 
  the 
  class 
  belong 
  to 
  the 
  Echinoidea. 
  4 
  genera 
  — 
  Echi- 
  

   nobrissus 
  3 
  species, 
  Holectypus 
  1, 
  Pygaster 
  2, 
  and 
  Py 
  gurus 
  1 
  — 
  

   represent 
  the 
  group 
  Exocyclica 
  ; 
  and 
  Acrosalenia 
  4 
  species, 
  Hemi- 
  

   cidaris 
  1, 
  Hemipedina 
  2, 
  Pedina 
  2, 
  Polyeyphus 
  1, 
  Pseudodiadema 
  4, 
  

   and 
  Stomechinus 
  1 
  species, 
  belong 
  to 
  the 
  Endocyclica. 
  No 
  Crinoidal 
  

   remains 
  have 
  hitherto 
  been 
  recorded. 
  One 
  species 
  (Acrosalenia 
  

   spinosa) 
  passes 
  up 
  from 
  the 
  Forest 
  Marble 
  ; 
  and 
  2 
  species 
  (Echino- 
  

   brissus 
  orbicularis 
  and 
  E. 
  dimidiatus) 
  pass 
  to 
  the 
  Coral 
  Hag. 
  Thus 
  

  

  20 
  species 
  are 
  restricted 
  to 
  this 
  uppermost 
  member 
  of 
  the 
  Lower 
  

   Oolite. 
  

  

  