﻿ANNIVERSARY 
  ADDRESS 
  OP 
  THE 
  PRESIDENT. 
  1 
  95 
  

  

  species. 
  Those 
  in 
  the 
  intermediate 
  Forest 
  Marble 
  are 
  nearly 
  the 
  

   same 
  species. 
  To 
  the 
  Kellaways 
  Eock 
  there 
  pass 
  3 
  genera 
  and 
  

   7 
  species, 
  to 
  the 
  Oxford 
  Clay 
  2 
  genera 
  and 
  7 
  species, 
  and 
  to 
  the 
  

   Coral 
  Rag 
  2 
  genera 
  and 
  6 
  species 
  ; 
  these 
  latter 
  are 
  nearly 
  all 
  the 
  

   same 
  long-range 
  species. 
  

  

  Dimyaria. 
  — 
  40 
  genera 
  and 
  185 
  species 
  occuring 
  in 
  this 
  division 
  

   of 
  the 
  Bivalvia 
  (the 
  next 
  highest 
  in 
  the 
  Jurassic 
  rocks 
  to 
  the 
  Inferior 
  

   Oolite) 
  have 
  been 
  described. 
  The 
  chief 
  genera 
  are 
  : 
  — 
  

  

  Area 
  10 
  species. 
  

  

  Astarte 
  21 
  

  

  Cardium 
  10 
  

  

  Modiola 
  14 
  

  

  Pholadomya 
  13 
  

  

  Tancredia 
  9 
  

  

  Trigonia 
  13 
  

  

  These 
  are 
  the 
  only 
  7 
  out 
  of 
  the 
  40 
  possessing 
  9 
  or 
  more 
  species 
  ; 
  

   9 
  genera 
  yield 
  only 
  one 
  species 
  each, 
  8 
  have 
  only 
  2, 
  6 
  have 
  3, 
  &c, 
  

   &c, 
  thus 
  showing 
  that 
  well-determined 
  genera 
  are 
  of 
  high 
  signifi- 
  

   cance 
  although 
  only 
  feebly 
  represented. 
  Numbers 
  when 
  stated 
  alone 
  

   may 
  not 
  to 
  some 
  appear 
  to 
  have 
  value 
  ; 
  but 
  those 
  accustomed 
  to 
  study 
  

   any 
  given 
  fauna, 
  at 
  once 
  appreciate 
  the 
  value 
  of 
  genera 
  and 
  species 
  

   from 
  their 
  numerical 
  representation. 
  19 
  genera 
  and 
  36 
  species 
  

   pass 
  up 
  from 
  the 
  Puller's 
  Earth 
  to 
  the 
  Great 
  Oolite 
  ; 
  10 
  genera 
  and 
  

   16 
  species 
  range 
  into 
  the 
  Forest 
  Marble, 
  20 
  genera 
  and 
  44 
  species 
  to 
  

   the 
  Cornbrash, 
  and 
  10 
  genera 
  and 
  10 
  species 
  to 
  the 
  Corallian 
  beds. 
  

  

  Gasteropoda. 
  — 
  40 
  genera 
  and 
  247 
  species 
  enrich 
  this 
  division 
  of 
  

   the 
  Lower 
  Oolitic 
  rocks. 
  The 
  greater 
  number 
  of 
  these 
  species 
  have 
  

   been 
  critically 
  described 
  by 
  Messrs. 
  Lycett 
  and 
  Morris 
  in 
  their 
  mono- 
  

   graph 
  upon 
  ' 
  The 
  Great 
  Oolite 
  Mollusca 
  ' 
  from 
  Minchinhampton, 
  

   near 
  Stroud*. 
  The 
  Appendix 
  and 
  Supplement 
  by 
  Dr. 
  Lycett 
  in 
  

   1863 
  t 
  greatly 
  add 
  to 
  the 
  previously 
  known 
  species, 
  embracing, 
  in 
  

   addition 
  to 
  the 
  Great-Oolite 
  fauna, 
  descriptions 
  of 
  the 
  Mollusca 
  

   of 
  the 
  Stonesfield 
  Slate, 
  Forest 
  Marble, 
  and 
  Cornbrash. 
  In 
  this 
  

   great 
  work 
  the 
  authors 
  describe 
  265 
  species 
  of 
  Gasteropoda, 
  and 
  

   from 
  260 
  to 
  265 
  species 
  of 
  Lamellibranchiata. 
  The 
  Great-Oolite 
  

   fauna 
  of 
  the 
  Minchinhampton 
  beds 
  is 
  not 
  local 
  or 
  exceptional, 
  

   although 
  so 
  rich, 
  but 
  represents 
  a 
  characteristic 
  series 
  of 
  Mollusca 
  

   occurring 
  in 
  other 
  and 
  distant 
  localities 
  on 
  the 
  same 
  geological 
  

   horizon. 
  The 
  researches 
  of 
  Mr. 
  Whiteaves 
  in 
  Oxfordshire 
  have 
  

   shown 
  that 
  out 
  of 
  about 
  140 
  species 
  in 
  this 
  area 
  114 
  are 
  common 
  

   to 
  the 
  Minchinhampton 
  beds 
  ; 
  this 
  also 
  is 
  confirmed 
  in 
  Somerset- 
  

   shire 
  and 
  Wiltshire 
  through 
  the 
  collection 
  made 
  by 
  Mr. 
  Walton 
  : 
  

   these 
  latter 
  comparisons 
  refer 
  to 
  the 
  more 
  minute 
  fauna 
  of 
  both 
  

   areas. 
  We 
  look 
  to 
  France 
  and 
  the 
  researches 
  of 
  Buvignier 
  for 
  a 
  

   fauna 
  equal 
  in 
  richness 
  and 
  variety 
  to 
  that 
  of 
  the 
  classical 
  district 
  

  

  * 
  Palasontographical 
  Society's 
  memoirs 
  for 
  the 
  years 
  1850, 
  1853, 
  1854, 
  

   1861, 
  1863. 
  

  

  t 
  lb. 
  1863, 
  Sappl. 
  Monog. 
  on 
  the 
  Mollusca 
  from 
  the 
  Stonesfield 
  Slate, 
  Great 
  

   Oolite, 
  Forest 
  Marble, 
  and 
  Cornbrash. 
  

  

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