﻿ANNIVERSARY 
  ADDEESS 
  OF 
  THE 
  PRESIDENT. 
  207 
  

  

  appears 
  to 
  be 
  the 
  same 
  form 
  that 
  also 
  ranges 
  into 
  the 
  Coral 
  Rag. 
  

   Out 
  of 
  64 
  Jurassic 
  species 
  it 
  is 
  the 
  only 
  long-lived 
  form. 
  33 
  species 
  

   occur 
  in 
  the 
  Lower 
  Lias, 
  all 
  restricted 
  ; 
  12 
  in 
  the 
  Upper 
  Lias, 
  all 
  

   equally 
  characteristic 
  ; 
  5 
  in 
  the 
  Great 
  Oolite 
  ; 
  and 
  3 
  in 
  the 
  Corn- 
  

   brash. 
  The 
  Oxford 
  and 
  Kimmeridge 
  Clays 
  only 
  have 
  2 
  species 
  in 
  

   common, 
  Glyphea 
  leptomana 
  and 
  G. 
  StricMandi. 
  

  

  Bryozoa. 
  — 
  None. 
  

  

  Brachiopoda. 
  — 
  Terebratula 
  coarctata, 
  T. 
  intermedia, 
  T. 
  obovata, 
  

   Waldheimia 
  ornithocephala, 
  W. 
  umbonella, 
  Rhynchonella 
  varians, 
  

   R. 
  socialis, 
  R. 
  yaxleyensis, 
  Lingula 
  Icevis, 
  and 
  Discina 
  centralis 
  

   comprise 
  all 
  the 
  species 
  known 
  in 
  the 
  Kellaways 
  Rock. 
  R. 
  varians 
  

   and 
  W. 
  ornithocephala 
  occur 
  also 
  in 
  the 
  Oxford 
  Clay, 
  and 
  W. 
  obovata 
  

   in 
  the 
  Corallian 
  beds. 
  

  

  Lamellibranchjata. 
  Monomyaria. 
  — 
  11 
  genera 
  and 
  28 
  species 
  

   occur, 
  ^ 
  of 
  which 
  appeared 
  in 
  and 
  came 
  from 
  the 
  Cornbrash, 
  

   jfg 
  pass 
  to 
  the 
  Oxford 
  Clay, 
  and 
  x 
  7 
  4 
  to 
  the 
  Corallian 
  rocks. 
  The 
  

   species 
  that 
  commence 
  in 
  the 
  Kellaways 
  Rock 
  are 
  Anomia 
  

   incequivalvis, 
  Avicula 
  ovcdis, 
  Eocogyra 
  nana, 
  Gryphcea 
  bilobata, 
  

   G. 
  dilatata, 
  Lima 
  notata, 
  L. 
  obscura, 
  Ostrea 
  archetypa, 
  0. 
  procerula, 
  

   0. 
  striata, 
  0. 
  undosa, 
  and 
  Pinna 
  mitis 
  ; 
  but 
  only 
  4 
  genera 
  and 
  8 
  of 
  

   the 
  above 
  species 
  are 
  essentially 
  Callovian, 
  viz. 
  Anomia 
  incequivalvis, 
  

   Gryphcea 
  bilobata, 
  Lima 
  notata, 
  L. 
  obscura, 
  Ostrea 
  archetypa, 
  0. 
  pro- 
  

   cerula, 
  0. 
  striata, 
  and 
  0. 
  undosa. 
  The 
  Kellaways 
  Rock 
  is 
  finely 
  

   developed 
  in 
  Yorkshire, 
  north 
  and 
  south 
  of 
  Scarborough, 
  in 
  the 
  

   Castle 
  Hill 
  and 
  near 
  North 
  Cave. 
  In 
  Lincolnshire 
  it 
  has 
  thinned 
  

   away 
  to 
  3 
  feet 
  ; 
  and 
  appears 
  no 
  more 
  until 
  recognized 
  in 
  its 
  original 
  

   area 
  in 
  Wiltshire, 
  where, 
  in 
  the 
  form 
  of 
  rock, 
  it 
  is 
  richly 
  fossili- 
  

   ferous, 
  individually 
  rather 
  than 
  specifically. 
  

  

  Dimyaria. 
  — 
  18 
  genera 
  and 
  57 
  species 
  form 
  the 
  Dimyarian 
  

   fauna 
  of 
  the 
  Kellaways 
  Rock 
  ; 
  \^ 
  are 
  also 
  Cornbrash 
  forms, 
  ^ 
  

   pass 
  up 
  to 
  the 
  Oxford 
  Clay, 
  and 
  x 
  7 
  4 
  to 
  the 
  Corallian 
  beds. 
  The 
  

   special 
  Callovian 
  forms 
  are 
  Anatina 
  versicostata, 
  Cardium 
  subdissi- 
  

   mile, 
  Corbis 
  Icevis, 
  Cucullcea 
  cemula, 
  C. 
  minima, 
  Isocardia 
  clarissima, 
  

   Lucina 
  lirata, 
  L. 
  pulchra, 
  Modiola 
  Morrisii, 
  Myacites 
  Alduini, 
  

   Nucula 
  ornata, 
  Solemya 
  Woodwardiana, 
  Trigonia 
  complanata, 
  T. 
  

   paucicostata, 
  T. 
  rupellensis, 
  and 
  T. 
  Williamsoni. 
  These 
  all 
  com- 
  

   mence 
  in 
  and 
  are 
  confined 
  to 
  the 
  Kellaways, 
  none 
  ranging 
  

   higher. 
  It 
  will 
  be 
  seen 
  that 
  9 
  of 
  these 
  genera 
  are 
  only 
  represented 
  

   by 
  1 
  species. 
  If 
  the 
  same 
  occurred 
  in 
  living 
  genera, 
  we 
  should 
  

   regard 
  them 
  as 
  extremely 
  rare; 
  and 
  there 
  are 
  examples 
  in 
  our 
  

   modern 
  seas 
  of 
  the 
  same 
  rarity 
  (e. 
  g. 
  Pholadomya). 
  It 
  is 
  only 
  

   negative 
  evidence 
  withal 
  that 
  we 
  possess 
  when 
  dealing 
  with 
  the 
  

   paucity 
  or 
  abundance 
  of 
  species 
  in 
  any 
  given 
  formation 
  ; 
  but 
  the 
  

   tabular 
  analysis 
  of 
  the 
  fauna 
  of 
  all 
  the 
  formations 
  (Table 
  XLIV. 
  

   p. 
  226) 
  faithfully 
  represents 
  the 
  present 
  aspect 
  and 
  value 
  of 
  the 
  

   work 
  done 
  by 
  British 
  palaeontologists 
  up 
  to 
  the 
  present 
  time. 
  Car- 
  

   dium 
  (6 
  species), 
  Myacites 
  (6), 
  Pholadomya 
  (7), 
  and 
  Trigonia 
  

   (6 
  species), 
  are 
  the 
  only 
  genera 
  fairly 
  well 
  represented. 
  

  

  Gasteropoda. 
  — 
  Very 
  few 
  of 
  the 
  genera 
  and 
  species 
  of 
  the 
  Kel- 
  

   laways 
  Gasteropoda 
  range 
  higher. 
  The 
  fauna, 
  too, 
  is 
  small, 
  only 
  } 
  g. 
  

  

  