﻿ANNIVERSARY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  213 
  

  

  Ammonites 
  collected 
  from 
  the 
  Oxford 
  Clay 
  of 
  Christian 
  Malford. 
  

   Acanthoteuthis 
  is 
  the 
  Belemnoteuthis 
  of 
  Pearce, 
  the 
  Lipoteuthis 
  of 
  

   Meyer, 
  and 
  the 
  Enoploteuthis 
  of 
  D'Orbigny. 
  Mantell 
  and 
  Owen 
  have 
  

   made 
  this 
  genus 
  classical 
  through 
  their 
  papers 
  in 
  the 
  Philosophical 
  

   Transactions 
  of 
  the 
  Eoyal 
  Society. 
  Besides 
  CoccoteutJtis 
  latipinnis, 
  

   from 
  the 
  Kimmeridge 
  Clay, 
  we 
  have 
  an 
  undescribed 
  form 
  of 
  the 
  

   same 
  genus 
  from 
  the 
  Oxford 
  Clay 
  of 
  Chippenham. 
  In 
  many 
  of 
  

   the 
  older 
  collections, 
  made 
  at 
  the 
  time 
  of 
  the 
  construction 
  of 
  the 
  

   Great 
  Western 
  Railway, 
  new 
  species, 
  I 
  doubt 
  not, 
  will 
  yet 
  be 
  found 
  

   on 
  careful 
  examination. 
  

  

  Pisces. 
  — 
  Aspidorhynchus 
  euodus, 
  Lepidotus 
  macrorhynchus, 
  Lepto- 
  

   lepis 
  costalis, 
  and 
  L. 
  macrophthalmus 
  are 
  all 
  the 
  known 
  fishes 
  in 
  the 
  

   Oxford 
  Clay, 
  neither 
  do 
  they 
  occur 
  out 
  of 
  it. 
  All 
  the 
  species 
  of 
  

   fish 
  occurring 
  in 
  the 
  Lias, 
  the 
  Lower 
  Oolite, 
  Middle 
  Oolite, 
  and 
  

   Upper 
  Oolite 
  are 
  totally 
  distinct 
  ; 
  no 
  species 
  unites 
  any 
  of 
  the 
  divi- 
  

   sions, 
  so 
  that 
  the 
  range 
  of 
  the 
  61 
  genera 
  and 
  219 
  species 
  occurring 
  

   in 
  the 
  Jurassic 
  rocks 
  is 
  definite, 
  and 
  of 
  great 
  significance 
  stratigra- 
  

   phically. 
  Only 
  2 
  species 
  out 
  of 
  106 
  are 
  common 
  to 
  the 
  Lower 
  

   and 
  Middle 
  Lias, 
  and 
  only 
  2 
  to 
  the 
  Lower 
  and 
  Upper 
  Lias, 
  and 
  none 
  

   pass 
  to 
  any 
  horizon 
  in 
  the 
  Oolitic 
  beds 
  above. 
  No 
  Lower-Oolite 
  

   species 
  pass 
  to 
  the 
  Middle 
  Oolite, 
  and 
  no 
  Middle-Oolite 
  species 
  to 
  

   the 
  Upper. 
  The 
  Great 
  Oolite 
  has 
  §g, 
  none 
  ranging 
  higher; 
  after 
  

   which 
  the 
  Kimmeridge 
  Clay 
  yields 
  15 
  species, 
  the 
  only 
  large 
  number. 
  

  

  Reptilia. 
  — 
  13 
  species 
  representing 
  7 
  genera 
  have 
  now 
  been 
  de- 
  

   scribed 
  from 
  the 
  Oxford 
  Cla} 
  T 
  , 
  namely 
  — 
  Ichthyosaurus 
  dilatatus, 
  

   I. 
  tliyreospondylus, 
  Megcdosaurus 
  BucJdandi, 
  Murcenosaurus 
  Leedsii, 
  

   Pleslosaurus 
  eurymerus, 
  P. 
  Leedsii, 
  P. 
  oxoniensis, 
  P. 
  plicatus, 
  P. 
  tro- 
  

   elianterius, 
  Pliosaums 
  cequalis, 
  P. 
  Evansi, 
  Streptospondylus 
  Cuvieri, 
  

   and 
  Priodontognathus 
  Phillipsii 
  ; 
  and 
  only 
  two 
  of 
  these 
  pass 
  to 
  the 
  

   Corallian 
  beds 
  (Pliosaurus 
  cequalis 
  and 
  Megalosawrus 
  BucJdandi), 
  

   and 
  5 
  species 
  to 
  the 
  Kimmeridge 
  Clay. 
  6 
  species 
  are 
  specially 
  

   Oxfordian, 
  viz. 
  Murcenosaurus 
  Leedsii, 
  Plesiosaurus 
  eurymerus, 
  

   P. 
  Leedsii, 
  P. 
  oxoniensis, 
  Pliosaurus 
  Evansi, 
  and 
  Priodontognathus 
  

   Phillipsii. 
  The 
  above 
  genera 
  illustrate 
  the 
  following 
  4 
  orders 
  — 
  the 
  

   Opisthoccelian 
  Crocodilia 
  through 
  Streptospondylus, 
  the 
  Sauro- 
  

   pterygia 
  through 
  Murcenosaurus, 
  Pliosaurus, 
  and 
  Plesiosaurus, 
  the 
  

   Ichthyopterygia 
  through 
  Ichthyosaurus, 
  and 
  the 
  Dinosauria 
  through 
  

   Megalosaurus 
  and 
  Pristodontoynathus. 
  

  

  Mammalia. 
  — 
  None 
  known. 
  

  

  [For 
  the 
  Analysis 
  of 
  the 
  Oxford-Clay 
  species 
  see 
  Table 
  XXXVII., 
  

   p. 
  214.] 
  

  

  