﻿194 
  PROCEEDINGS 
  OE 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  The 
  Coinatulidce 
  stand 
  alone, 
  and 
  comprise 
  5 
  genera, 
  3 
  of 
  which 
  

   with 
  4 
  species 
  occur 
  in 
  the 
  Great 
  Oolite 
  — 
  Actinometra 
  with 
  2 
  species, 
  

   Antedon 
  and 
  Amphiura 
  each 
  with 
  one 
  species. 
  

  

  Crinoidea. 
  — 
  Apiocrinus, 
  Bourgueticrinus, 
  Millericrinus, 
  and 
  Pen- 
  

   tacrinus, 
  in 
  all 
  10 
  species, 
  range 
  through 
  the 
  Great 
  Oolite. 
  36 
  are 
  

   known 
  from 
  the 
  whole 
  Jurassic 
  group. 
  

  

  Annelida. 
  — 
  Only 
  2 
  genera 
  (Serpula 
  and 
  Vermilia) 
  and 
  7 
  species 
  

   occur 
  ; 
  the 
  former 
  genus 
  yields 
  6, 
  the 
  latter 
  1 
  species. 
  Serpula 
  

   intestinalis 
  and 
  S. 
  lacerata 
  range 
  from 
  the 
  Great 
  Oolite 
  to 
  the 
  Coral 
  

   Rag 
  inclusive, 
  and 
  the 
  only 
  other 
  species 
  (S. 
  tetragona) 
  to 
  the 
  Corn- 
  

   brash. 
  

  

  Crustacea. 
  — 
  Glyphea 
  rostrata, 
  Pagurus 
  platycheles, 
  Palceinachus 
  

   longipes, 
  Pollicipes 
  ooliticus, 
  and 
  Prosopon 
  mammillatum 
  comprise 
  

   the 
  whole 
  of 
  the 
  Great-Oolite 
  Crustacea. 
  Glyphea 
  rostrata 
  is 
  the 
  

   only 
  species 
  that 
  passes 
  to 
  higher 
  horizons, 
  ranging 
  up 
  to 
  the 
  Coral 
  

   Hag 
  ; 
  the 
  remaining 
  4 
  species 
  are 
  restricted. 
  More 
  than 
  half 
  the 
  

   known 
  Jurassic 
  species 
  (39) 
  are 
  Liassic 
  ; 
  24 
  genera 
  and 
  64 
  species 
  

   occur 
  in 
  the 
  Jurassic 
  rocks. 
  

  

  Bryozoa. 
  — 
  19 
  genera 
  and 
  51 
  species 
  (mostly 
  Inferior 
  and 
  Great 
  

   Oolite) 
  occur 
  through 
  the 
  whole 
  formation. 
  17 
  species 
  are 
  Inferior 
  

   Oolite, 
  and 
  31 
  Great 
  Oolite. 
  Only 
  6 
  are 
  common 
  to 
  the 
  two 
  hori- 
  

   zons, 
  viz. 
  Diastopora 
  cricopora, 
  D. 
  oolitica, 
  D. 
  lamellosa, 
  D. 
  scobinula, 
  

   Heteropora 
  conifera, 
  and 
  H. 
  pustulosa 
  ; 
  and 
  only 
  3 
  species 
  pass 
  to 
  

   higher 
  beds, 
  viz. 
  Berenicea 
  luciensis, 
  Stomatopora 
  dichotoma 
  (to 
  Corn- 
  

   brash), 
  and 
  Terebellaria 
  ramosissima 
  (occurs 
  in 
  the 
  Forest 
  Marble 
  and 
  

   Coral 
  Rag). 
  Out 
  of 
  the 
  19 
  genera 
  and 
  51 
  species 
  known, 
  16 
  genera 
  

   and 
  31 
  species 
  occur 
  in 
  this 
  horizon. 
  

  

  Brachiofoda. 
  — 
  9 
  genera 
  and 
  26 
  species 
  occur 
  in 
  the 
  Great 
  Oolite. 
  

   Numerically 
  Terebratula 
  is 
  the 
  richest 
  in 
  species 
  (7) 
  ; 
  Rhynchonella 
  

   has 
  5, 
  Waldheimia 
  4, 
  Terebratella 
  4, 
  and 
  Crania 
  2 
  ; 
  the 
  remaining 
  

   4 
  genera 
  only 
  possess 
  one 
  species 
  each. 
  4 
  genera 
  and 
  7 
  species 
  pass 
  

   from 
  the 
  Fuller's 
  Earth 
  to 
  the 
  Great 
  Oolite; 
  and 
  3 
  genera 
  and 
  11 
  

   species 
  are 
  common 
  to 
  the 
  Great 
  Oolite 
  and 
  Forest 
  Marble, 
  § 
  to 
  the 
  

   Cornbrash, 
  I 
  to 
  the 
  Kellaways, 
  and 
  } 
  to 
  the 
  Oxford 
  Clay. 
  No 
  

   Great-Oolite 
  form 
  passes 
  higher. 
  

  

  La.mellibra.ncri 
  ata. 
  — 
  95 
  genera 
  and 
  about 
  1360 
  species 
  in 
  both 
  

   groups 
  of 
  this 
  class 
  range 
  through 
  the 
  Jurassic 
  Rocks, 
  and 
  almost 
  

   culminate 
  in 
  the 
  Great 
  Oolite 
  ; 
  for 
  above 
  this 
  horizon 
  the 
  whole 
  

   class 
  of 
  the 
  Lamellibranchiata 
  becomes 
  greatly 
  diminished. 
  In 
  the 
  

   Forest 
  Marble 
  they 
  number 
  § 
  3, 
  or 
  about 
  2 
  species 
  to 
  a 
  genus 
  ; 
  in 
  the 
  

   Cornbrash 
  j 
  4 
  ^, 
  or 
  3| 
  to 
  a 
  genus 
  ; 
  in 
  the 
  Kellaways 
  §jj, 
  also 
  3 
  species 
  

   to 
  a 
  genus; 
  the 
  Oxford 
  Clay 
  fj, 
  or 
  2| 
  to 
  a 
  genus, 
  the 
  Corallian 
  

   beds 
  ^g 
  3 
  !, 
  the 
  Kimmeridge 
  ] 
  3 
  7 
  , 
  or 
  about 
  3 
  species 
  to 
  a 
  genus. 
  

  

  Monomyaria. 
  — 
  16 
  genera 
  and 
  80 
  species 
  occur 
  in 
  the 
  Great 
  Oolite. 
  

   The 
  genera 
  are 
  richer 
  in 
  species 
  in 
  the 
  Inferior 
  Oolite, 
  where 
  the 
  

   known 
  15 
  genera 
  contain 
  106 
  species. 
  6 
  genera 
  and 
  17 
  species 
  

   pass 
  to 
  the 
  Forest 
  Marble, 
  12 
  genera 
  and 
  33 
  species 
  to 
  the 
  Corn- 
  

   brash, 
  the 
  superior 
  limit 
  of 
  the 
  Lower 
  Oolite 
  ; 
  this 
  number 
  is 
  chiefly 
  

   made 
  up 
  of 
  species 
  of 
  Avicula 
  (5), 
  Gervillia 
  (3), 
  Lima 
  (5), 
  Ostrea 
  (5), 
  

   Paten 
  (8), 
  and 
  Placunopsis 
  (2), 
  all 
  genera 
  with 
  a 
  large 
  number 
  of 
  

  

  