﻿ANNIVERSARY 
  ADDEESS 
  OE 
  THE 
  PRESIDENT. 
  2IQ, 
  

  

  British 
  Jurassic 
  rocks. 
  I 
  do 
  not 
  doubt 
  their 
  occurrence, 
  but 
  they 
  

   have 
  not 
  been 
  recorded. 
  

  

  Cgel 
  enter 
  ata. 
  — 
  As 
  in 
  the 
  Kellaways 
  and 
  Oxford 
  Clay, 
  or 
  Oxfor- 
  

   dian 
  strata, 
  so 
  in 
  the 
  Kimnieridge, 
  no 
  remains 
  whatever 
  of 
  Actinozoa 
  

   have 
  occurred 
  notwithstanding 
  all 
  the 
  research 
  into 
  these 
  three 
  

   horizons. 
  

  

  Echtnodermata. 
  — 
  Cidaris 
  baculifera, 
  C. 
  boloniensis, 
  C. 
  spinosus, 
  

   Hemipedina 
  Gunningtoni, 
  H. 
  corallina, 
  H. 
  Morrisii, 
  and 
  Pentacrinus 
  

   sigmaringensis, 
  or 
  3 
  genera 
  and 
  7 
  species, 
  compose 
  the 
  Echino- 
  

   dermal 
  fauna 
  of 
  the 
  Kimmeridge 
  Clay. 
  

  

  Annelida. 
  — 
  Only 
  3 
  species 
  known, 
  Serpida 
  Poyeri, 
  S. 
  variabilis, 
  

   and 
  Yermicidaria 
  contorta. 
  

  

  Crustacea. 
  — 
  Callianassa 
  isochela, 
  Eryma 
  Babeaui, 
  Glypliea 
  lepto- 
  

   mana, 
  G. 
  StricMandi, 
  Mecochirus 
  Peytoni, 
  Pollicipes 
  Hausmanni, 
  

   and 
  Scalpellum 
  reticulatum 
  all 
  occur. 
  The 
  species 
  of 
  Glypliea 
  are 
  

   also 
  in 
  the 
  Oxford 
  Clay. 
  

  

  Bryozoa. 
  — 
  None 
  known. 
  

  

  Brachiopoda. 
  — 
  Eour 
  species 
  of 
  Phynclwnella, 
  3 
  Discince, 
  1 
  liw- 
  

   gula, 
  and 
  2 
  species 
  of 
  Terebratida, 
  or 
  4 
  genera 
  and 
  10 
  species, 
  are 
  

   all 
  that 
  are 
  known 
  in 
  the 
  Kimmeridge 
  Clay. 
  Individuals 
  of 
  the 
  

   non-articulate 
  forms 
  Lingida 
  and 
  Discina 
  are 
  abundant. 
  Discina 
  

   Humphresiana 
  and 
  Lingida 
  ovalis 
  also 
  occur 
  in 
  the 
  Corallian 
  series. 
  

   The 
  4 
  Phynchonello3 
  are 
  P. 
  Sutherlandi, 
  P. 
  subvariabilis, 
  P. 
  incon- 
  

   stans, 
  and 
  P. 
  pinguis. 
  The 
  remainder 
  are 
  Terebratida 
  Gesneri 
  and 
  

   T. 
  Joassi. 
  

  

  Lamellibranchiata. 
  Mommy 
  aria. 
  — 
  11 
  genera 
  and 
  42 
  described 
  

   species 
  are 
  known 
  in 
  the 
  Kimmeridge 
  Clay. 
  Prof. 
  Blake's 
  re- 
  

   searches 
  have 
  added 
  many 
  new 
  forms 
  to 
  the 
  fauna 
  of 
  the 
  British 
  rocks, 
  

   both 
  in 
  this 
  group 
  and 
  the 
  Dimyaria. 
  No 
  less 
  than 
  23 
  species 
  

   in 
  this 
  group 
  are 
  confined 
  to 
  the 
  Kimmeridge 
  beds. 
  6 
  pass 
  to 
  

   the 
  Portland 
  ; 
  they 
  are 
  Eocogyra 
  nana, 
  E. 
  spiralis, 
  Ostrea 
  deltoidea 
  ?, 
  

   0. 
  expansa, 
  0. 
  solitaria, 
  and 
  Perna 
  mytiloides. 
  The 
  alliance 
  below 
  

   with 
  the 
  Corallian 
  rocks 
  is 
  through 
  15 
  species, 
  belonging 
  to 
  7 
  

   genera. 
  2 
  genera, 
  Ostrea 
  with 
  12 
  species, 
  and 
  Pecten 
  with 
  10, 
  are 
  

   largely 
  represented 
  ; 
  the 
  remaining 
  9, 
  except 
  Avicida 
  with 
  5 
  species, 
  

   do 
  not 
  average 
  two 
  to 
  each 
  genus. 
  

  

  Dimyaria. 
  — 
  26 
  genera 
  and 
  58 
  species 
  of 
  this 
  group 
  occur 
  in 
  

   the 
  Kimmeridge 
  Clay. 
  36 
  of 
  these 
  58 
  species 
  are 
  confined 
  

   to 
  this 
  horizon. 
  12 
  species 
  are 
  common 
  to 
  it 
  and 
  the 
  Corallian 
  

   beds 
  below 
  ; 
  these 
  passage 
  or 
  uniting 
  species 
  are 
  Astarte 
  ovata, 
  Car- 
  

   dium 
  striatidum, 
  Goniomya 
  minuta, 
  G, 
  v-scripta, 
  Homomya 
  gracilis, 
  

   Modiola 
  bipartita, 
  M. 
  pallida, 
  Myacites 
  oblatus, 
  Opis 
  corallina, 
  

   Pholadomya 
  paucicosta, 
  Thracia 
  depressa, 
  and 
  Trigonia 
  clavellata 
  ; 
  

   probably 
  Mactra 
  tenuissima 
  is 
  also 
  a 
  passage 
  form. 
  So 
  far 
  as 
  we 
  

   know, 
  7 
  genera 
  and 
  10 
  species 
  pass 
  to 
  the 
  Portland 
  beds. 
  I 
  deem 
  

   it 
  necessary 
  to 
  name 
  the 
  connecting 
  species 
  of 
  the 
  Kimmeridgian 
  

   and 
  Portlandian 
  rocks 
  ; 
  they 
  arc 
  Cardium 
  morinicum, 
  Modiola 
  pal- 
  

   lida, 
  Nucula 
  obliquata, 
  Pholadomya 
  rustica, 
  Pleuromya 
  cequi 
  striata, 
  

   Thracia 
  depressa, 
  'Trigonia 
  incurva, 
  T. 
  ManseP, 
  T. 
  muricata, 
  and 
  

   T. 
  Pellati. 
  

  

  