﻿I98 
  PKOCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  are 
  scattered, 
  together 
  with 
  shells, 
  corals, 
  Echinoidea 
  &c, 
  over 
  the 
  

   surface 
  of 
  the 
  slates. 
  

  

  Sauropterygia, 
  Owen, 
  Plesiosauria, 
  Huxley 
  . 
  — 
  Only 
  one 
  species 
  (Ple- 
  

   siosaurus 
  serraticus) 
  known, 
  associated 
  with 
  the 
  Ichthyosauria 
  in 
  the 
  

   Stonesfield 
  Slate. 
  The 
  gigantic 
  Upper-Lias 
  forms 
  from 
  near 
  Whitby 
  

   surpass 
  in 
  size 
  those 
  of 
  any 
  other 
  locality 
  or 
  formation. 
  Although 
  

   45 
  species 
  are 
  known 
  in 
  Britain 
  only 
  the 
  one 
  species 
  named 
  occurs 
  

   in 
  the 
  Great 
  Oolite 
  ; 
  5 
  are 
  found 
  in 
  the 
  Corallian 
  beds, 
  12 
  in 
  the 
  

   Kimmeridge 
  Clay, 
  and 
  2 
  in 
  the 
  Portlandian 
  beds. 
  Pliosaurus 
  is 
  not 
  

   known 
  below 
  the 
  Oxford 
  Clay 
  and 
  Corallian 
  rocks. 
  

  

  Pterosauria 
  (Ornithosauria, 
  Seeley). 
  — 
  This 
  group 
  of 
  flying 
  Kep- 
  

   tilia 
  exclusively 
  belongs 
  to 
  the 
  Mesozoic 
  epoch. 
  The 
  genera 
  

   Pterodactylus, 
  Dimorphodon, 
  and 
  Rhamphorhynchus 
  all 
  occur 
  in 
  

   Britain 
  — 
  Dimorphodon 
  and 
  Pterodactylus 
  in 
  the 
  Lower 
  Lias, 
  and 
  

   Rhamphorhynchus 
  and 
  Pterodactylus 
  in 
  the 
  Great 
  Oolite 
  ; 
  the 
  former 
  

   represented 
  by 
  3 
  species 
  — 
  R. 
  Buc7clandi 
  % 
  R. 
  Prestwicliii, 
  and 
  R. 
  de- 
  

   pressirostris 
  ; 
  the 
  latter 
  by 
  3 
  species 
  — 
  P. 
  Aclandi, 
  P. 
  Duncani, 
  and 
  

   P. 
  Kiddii. 
  

  

  Dinosauria 
  (OrnitJioscelida, 
  Huxley). 
  — 
  The 
  whole 
  group 
  is 
  ex- 
  

   clusively 
  Mesozoic, 
  ranging 
  fiom 
  the 
  Triassic 
  to 
  the 
  Cretaceous 
  for- 
  

   mations. 
  The 
  most 
  important 
  genera 
  are 
  Iguanodon, 
  Hylceosaurus, 
  

   Megalosaurus, 
  Ceteosaurus, 
  and 
  Compsognathus. 
  This 
  order 
  under- 
  

   went 
  immense 
  development 
  in 
  the 
  Jurassic 
  and 
  Cretaceous 
  periods 
  ; 
  

   and 
  the 
  Cretaceous 
  genera 
  HypsilopJiodon, 
  Iguanodon, 
  Polacanthus, 
  

   Titanosaurus, 
  Acanthopholis, 
  &c. 
  attest 
  their 
  importance, 
  associated 
  

   as 
  they 
  are 
  zoologically 
  with 
  Megalosaurus 
  and 
  Ceteosaurus, 
  which 
  

   occur 
  in 
  the 
  Jurassic 
  rocks. 
  

  

  Megalosaurus. 
  — 
  The 
  great 
  carnivorous 
  Lizard 
  Megalosaurus 
  finds 
  

   its 
  true 
  home 
  in 
  the 
  Great 
  Oolite*. 
  Only 
  one 
  species 
  seems 
  to 
  have 
  

   been 
  named, 
  but 
  we 
  possess 
  evidence 
  of 
  two 
  more. 
  Megalosaurus 
  

   Bucklandi 
  possibly 
  ranges 
  from 
  the 
  Lower 
  Lias 
  to 
  the 
  Kimmeridge 
  

   Clay. 
  

  

  Ceteosaurus. 
  — 
  5 
  species 
  of 
  this 
  wonderful 
  Dinosaurian 
  genus 
  have 
  

   been 
  described 
  ; 
  the 
  grandest 
  form, 
  C. 
  oxoniensisf, 
  is 
  from 
  the 
  Great 
  

   Oolite 
  of 
  Enslow 
  Bridge 
  near 
  Oxford. 
  The 
  other 
  species 
  are 
  C. 
  

   glymptonensis, 
  C. 
  longus, 
  Owen, 
  C. 
  medius, 
  Owen, 
  and 
  a 
  new 
  species 
  

   described 
  by 
  Dr. 
  Hulke, 
  from 
  the 
  Kimmeridge 
  Clay. 
  C. 
  longus 
  is 
  

   of 
  Portland 
  age, 
  but 
  doubtful 
  in 
  the 
  Great 
  Oolite. 
  

  

  Oolithes. 
  — 
  Are 
  believed 
  to 
  be 
  ova 
  either 
  of 
  Chelonia 
  or 
  Crocodilia. 
  

   0. 
  hatlionica, 
  so 
  named 
  by 
  Professor 
  Buckman. 
  

  

  The 
  following 
  grouping 
  will 
  show 
  the 
  distribution 
  of 
  the 
  Great- 
  

   Oolite 
  Eeptilia, 
  and 
  the 
  numerical 
  value 
  of 
  the 
  species 
  : 
  — 
  

  

  * 
  Vide 
  Phillips, 
  'Geol. 
  of 
  Oxford 
  and 
  Valley 
  of 
  the 
  Thames,' 
  pp. 
  196-219, 
  

   for 
  the 
  complete 
  history 
  of 
  Megalosaurus. 
  

  

  t 
  Vide 
  ' 
  Geol. 
  of 
  Oxford 
  and 
  Valley 
  of 
  the 
  Thames,' 
  pp. 
  245-294. 
  

  

  