﻿ANXIYERSAEY 
  ADDRESS 
  OF 
  THE 
  PRESIDENT. 
  

  

  215 
  

  

  full)* 
  referred 
  ; 
  the 
  last-named 
  species 
  is 
  said 
  to 
  have 
  occurred 
  in 
  

   the 
  Great 
  Oolite 
  ; 
  this 
  is 
  also 
  doubtful. 
  

  

  Amorphozoa. 
  — 
  Scyphia 
  cylindrical 
  and 
  Spongia 
  jloriceps 
  are 
  all 
  

   that 
  are 
  known 
  out 
  of 
  the 
  11 
  occurring 
  in 
  the 
  Jurassic 
  rocks 
  ; 
  only 
  

   one 
  species 
  occurs 
  in 
  the 
  Lower 
  Lias 
  (Grantia 
  antiqim), 
  9 
  in 
  the 
  Great 
  

   Oolite, 
  and 
  the 
  2 
  Corallian 
  species 
  now 
  recorded. 
  

  

  Rhizopoda. 
  — 
  jSTo 
  species 
  is 
  known 
  to 
  occur 
  in 
  the 
  Lower 
  Oolite, 
  

   and 
  only 
  3 
  in 
  the 
  Middle 
  ; 
  Dentalina 
  may 
  be 
  the 
  single 
  genus 
  in 
  

   the 
  Corallian 
  beds. 
  

  

  Ccelexterata. 
  — 
  Nearly 
  all 
  the 
  Actinozoa 
  of 
  the 
  Corallian 
  rocks 
  

   are 
  compound 
  or 
  branching 
  forms, 
  the 
  exceptions 
  being 
  Monili- 
  

   valtia 
  dispar 
  and 
  Protoseris 
  Waltoni. 
  10 
  genera 
  and 
  14 
  species 
  

   range 
  through 
  the 
  beds 
  composing 
  this 
  formation; 
  the 
  remaining 
  

   8 
  genera 
  and 
  12 
  species 
  are 
  — 
  Comoseris 
  irradians, 
  Goniocera 
  socialis, 
  

   Isastrcea 
  explanata, 
  I. 
  GreenougMi, 
  Rhabdophyllia 
  Phillipsii, 
  R. 
  

   Edwardsii, 
  Stylina 
  de 
  la 
  Bechei, 
  S. 
  tubidifera, 
  Thamnastrcea 
  arach- 
  

   noides, 
  T. 
  rotata, 
  Thecosmilia 
  annularis, 
  and 
  Calamophyllia 
  Stokesii. 
  

   All 
  are 
  confined 
  to 
  the 
  Coral 
  Rag, 
  except 
  one 
  species, 
  viz. 
  Tliamnastrcea 
  

   arachnoides, 
  which 
  is 
  also 
  Cornbrash. 
  Dorset 
  and 
  Wilts, 
  with 
  

   Malton, 
  Ayton, 
  Hackness, 
  and 
  Seamer, 
  in 
  Yorkshire, 
  are 
  the 
  chief 
  

   localities 
  known. 
  This 
  special 
  Coral 
  fauna 
  is 
  the 
  largest 
  since 
  

   the 
  deposition 
  of 
  the 
  Great 
  Oolite, 
  which 
  yields 
  * 
  § 
  species, 
  and 
  the 
  

   Inferior 
  Oolite 
  Jg. 
  We 
  have 
  seen 
  that 
  only 
  one 
  species 
  occurs 
  in 
  the 
  

   Forest 
  Marble 
  and 
  1 
  in 
  the 
  Cornbrash. 
  No 
  species 
  is 
  known 
  either 
  

   in 
  the 
  Kellaways 
  Rock 
  or 
  the 
  Oxford 
  Clay 
  ; 
  nor 
  do 
  we 
  know 
  any 
  

   species 
  in 
  the 
  Kimmeridge 
  Clay. 
  

  

  Echixodermata. 
  — 
  15 
  genera 
  and 
  28 
  species 
  occur, 
  and 
  of 
  these 
  

   26 
  are 
  entirely 
  confined 
  to 
  the 
  Corallian 
  beds. 
  Two 
  species, 
  Echino- 
  

   brissus 
  dimidiatus 
  and 
  E. 
  orbicularis, 
  are 
  also 
  Cornbrash. 
  Milleri- 
  

   crinus 
  echinatus 
  is 
  the 
  only 
  Crinoid, 
  and 
  Astropecten 
  rectus 
  the 
  only 
  

   Asteroid. 
  The 
  group 
  Echinoidea 
  Endocyclica 
  is 
  represented 
  by 
  6 
  

   genera 
  and 
  11 
  species, 
  and 
  the 
  Exocyclica 
  by 
  7 
  genera 
  and 
  15 
  

   species 
  • 
  they 
  are 
  : 
  — 
  

  

  . 
  f 
  Cidaris 
  2 
  species. 
  

  

  J 
  J 
  Glypticus 
  .... 
  1 
  

   1|i 
  Hemicidaris 
  . 
  . 
  1 
  

   I' 
  1 
  Hemipedina 
  . 
  . 
  2 
  

   r 
  § 
  I 
  Pseudodiadema 
  4 
  

   ^ 
  l^Stomechinus 
  . 
  . 
  1 
  

  

  '"Clypeus 
  .... 
  1 
  species. 
  

  

  Collyrites 
  . 
  . 
  1 
  

  

  Echinobrissus 
  5 
  

  

  -^ 
  Holectypus. 
  . 
  1 
  

  

  Hyboclypus 
  . 
  1 
  

  

  Pygaster 
  .... 
  1 
  

  

  l^Pygurus 
  .... 
  5 
  

  

  11 
  

  

  15 
  

  

  Compared 
  with 
  the 
  Inferior 
  and 
  Great 
  Oolite 
  the 
  Echinodermal 
  

   fauna 
  is 
  small; 
  the 
  former 
  yields 
  %\ 
  species, 
  and 
  the 
  latter 
  \\. 
  

  

  Axxelida. 
  — 
  Serpula 
  with 
  5 
  species, 
  and 
  Vermicular 
  -ia 
  with 
  2 
  ; 
  

   or 
  2 
  genera 
  and 
  7 
  species 
  comprise 
  all 
  the 
  known 
  Corallian 
  

   Annelida; 
  and, 
  except 
  the 
  Inferior 
  Oolite, 
  with 
  11 
  species, 
  no 
  

   other 
  horizon 
  in 
  the 
  Jurassic 
  rocks 
  has 
  yielded 
  so 
  many 
  forms. 
  

  

  