﻿222 
  

  

  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  Of 
  the 
  above 
  45 
  species 
  only 
  5 
  also 
  occur 
  in 
  other 
  horizons, 
  or 
  40 
  

   are 
  confined 
  to 
  the 
  Kimmeridge 
  beds. 
  The 
  5 
  are 
  Ichthyosaurus 
  

   dilatatus, 
  I. 
  thyreospondylus, 
  Megcdosaurus 
  BucMandi, 
  Plesiosaurus 
  

   plicatus, 
  and 
  P. 
  trochanteric, 
  all 
  also 
  occurring 
  in 
  the 
  Oxford 
  Clay, 
  

   the 
  only 
  species 
  in 
  the 
  intermediate 
  Corallian 
  being 
  Megalosaurns 
  

   Bucklandi; 
  and 
  this 
  is 
  the 
  only 
  genus 
  of 
  Eeptilia 
  uniting 
  the 
  

   Kimmeridge 
  and 
  Portland 
  beds. 
  The 
  Reptilian 
  fauna 
  of 
  the 
  Port- 
  

   landian 
  stage 
  is 
  5 
  genera 
  and 
  species. 
  This 
  large 
  Eeptilian 
  

   fauna 
  of 
  the 
  Kimmeridge 
  Clay 
  suggests 
  a 
  numerical 
  analysis 
  of 
  the 
  

   class 
  from 
  the 
  Lias 
  to 
  the 
  Portland 
  inclusive, 
  to 
  show 
  the 
  varia- 
  

   bility 
  of 
  distribution 
  both 
  of 
  the 
  aquatic 
  and 
  terrestrial 
  genera. 
  

  

  Table 
  XXXIX. 
  

  

  Orders. 
  

  

  m 
  

  

  05 
  

  

  o 
  

  

  en 
  

  

  s 
  

  

  5 
  

   |3 
  

  

  i 
  

  

  O 
  

  

  u 
  

  

  .© 
  

  

  i— 
  i 
  

  

  *X3 
  

   u 
  

   A 
  

  

  03 
  

  

  U 
  

  

  'o 
  

  

  O 
  

  

  5 
  

  

  ,2 
  

  

  •s 
  

  

  GQ 
  

   g 
  

  

  c 
  

  

  o 
  

  

  o 
  

  

  n 
  

   S3 
  

  

  M 
  

  

  o 
  

  

  O 
  

  

  l 
  

   l 
  

  

  I 
  

  

  i 
  

  

  o 
  

  

  © 
  

  

  bo 
  

  

  'u 
  

  

  s 
  

   1 
  

  

  M 
  

  

  J 
  

   1 
  

  

  H 
  

  

  Chelonia 
  

  

  Crocodilia 
  

  

  Ichtbyopterygia 
  . 
  . 
  . 
  

  

  Sauropterygia 
  

  

  Pterosauria 
  

  

  ; 
  8 
  

  

  2 
  

   2 
  

  

  ... 
  

  

  1 
  

  

  1 
  

   4 
  

  

  1 
  

   1 
  

  

  2 
  

  

  i 
  

  

  

  2 
  

   2 
  

  

  2 
  

   5 
  

  

  1 
  

   2 
  

  

  1 
  

  

  2 
  

   C 
  

  

  2 
  

   2 
  

  

  1 
  

  

  7 
  

  

  

  2 
  

  

  3 
  

  

  8 
  

  

  j 
  

  

  2 
  

  

  2 
  

  

  4 
  

   1 
  1 
  

  

  2 
  

  

  7 
  

  

  1 
  7 
  

   2 
  

  

  C 
  

  

  G 
  

  

  i 
  

  

  2 
  

   3 
  

  

  2 
  

   2 
  

  

  6 
  

   C 
  

  

  1 
  2 
  

   24 
  

  

  7 
  

   2C 
  

  

  1 
  2 
  

  

  68 
  

  

  5 
  

   1 
  O 
  

  

  1 
  

  

  1 
  8 
  

   22 
  

  

  Lacertilia 
  

  

  •2 
  

  

  

  

  

  

  

  

  The 
  above 
  Table 
  (XXXIX.) 
  shows 
  the 
  genera 
  and 
  species 
  in 
  the 
  

   7 
  orders 
  of 
  Eeptilia 
  and 
  their 
  range 
  through 
  the 
  13 
  divisions 
  of 
  

   the 
  Jurassic 
  rocks, 
  also 
  the 
  total 
  numbers 
  of 
  genera 
  and 
  species 
  in 
  

   each 
  of 
  the 
  horizons, 
  ranging 
  from 
  the 
  Lower 
  Lias 
  to 
  the 
  Portland. 
  

  

  Mammalia. 
  — 
  Xone 
  known. 
  

  

  