﻿AKNTTEESAEY 
  ADDEESS 
  OE 
  THE 
  PEESEDENT. 
  IO3 
  

  

  special 
  faunas. 
  Everywhere 
  in 
  this 
  area 
  Ostrea 
  Marshii, 
  Echino- 
  

   brissus 
  cluniadaris, 
  Avicula 
  echinata, 
  Gervillia 
  avicidoides, 
  Tere- 
  

   br 
  alula 
  obovata, 
  T. 
  ornitJiocephala, 
  Ammonites 
  macrocej)halus, 
  A. 
  

   Herveyi, 
  and 
  A. 
  discus 
  characterize 
  the 
  Cornbrash. 
  The 
  Great- 
  

   Oolite 
  forms 
  are 
  equally 
  distinct 
  and 
  important 
  — 
  Ostrea 
  Soiverbyi, 
  

   0. 
  subrugulosa, 
  Clypeus 
  Midleri, 
  Terebratida 
  maocillata, 
  Rhyncho- 
  

   nella 
  concinna, 
  Homomya 
  gibbosa, 
  Nautilus 
  Baberi, 
  N. 
  lieocagonus, 
  

   and 
  N. 
  subtruncatus 
  being 
  in 
  this 
  group 
  the 
  dominant 
  forms. 
  

  

  Uppee 
  Esttjaeixe 
  Sebies. 
  — 
  Nothing 
  in 
  the 
  south 
  and 
  south-west 
  

   of 
  England 
  resembles 
  these 
  beds: 
  they 
  show 
  an 
  alternation 
  of 
  

   marine 
  and 
  freshwater 
  conditions, 
  such 
  as 
  would 
  now 
  take 
  place 
  

   under 
  elevation 
  or 
  depression 
  in 
  the 
  estuaries 
  of 
  rivers 
  ; 
  but 
  few 
  

   fossils 
  accompany 
  these 
  clays 
  and 
  sands; 
  they 
  cover 
  but 
  small 
  

   areas, 
  and 
  often 
  occur 
  in 
  pipes 
  let 
  down 
  into 
  the 
  underlying 
  strata*. 
  

   We 
  are 
  indebted 
  to 
  Prof. 
  Morris 
  f 
  for 
  first 
  determining 
  the 
  estuarine 
  

   character 
  of 
  the 
  beds 
  above 
  the 
  Lincolnshire 
  Limestone. 
  Morris 
  

   identified 
  Cyrena 
  ((7. 
  Cunninghami), 
  Unio, 
  and 
  Paludina. 
  

  

  Geeat-Oolite 
  Limestone. 
  — 
  The 
  upper 
  zone 
  of 
  the 
  Great 
  Oolite, 
  

   here 
  as 
  elsewhere 
  in 
  England, 
  is 
  remarkably 
  uniform 
  in 
  character 
  

   in 
  its 
  range 
  from 
  Gloucestershire 
  to 
  Mid-Lincolnshire 
  ; 
  in 
  the 
  latter 
  

   area 
  it 
  thins 
  out, 
  and 
  finally 
  disappears 
  before 
  reaching 
  the 
  

   Hurnber. 
  A 
  considerable 
  proportion 
  of 
  the 
  species 
  also 
  occur 
  

   in 
  the 
  Cornbrash, 
  no 
  less 
  than 
  119 
  species 
  uniting 
  the 
  Cornbrash 
  

   proper 
  with 
  the 
  Great 
  Oolite 
  of 
  the 
  Midland 
  district. 
  The 
  chief 
  

   fossil 
  localities 
  noticed 
  in 
  the 
  Rutland 
  memoir 
  are 
  of 
  necessity 
  

   those 
  in 
  which 
  the 
  type 
  forms 
  exist 
  ; 
  the 
  present 
  agreement 
  of 
  the 
  

   species 
  from 
  each 
  locality 
  is 
  a 
  coincidence 
  not 
  to 
  be 
  overlooked; 
  

   and 
  it 
  will 
  be 
  seen, 
  on 
  consulting 
  Table 
  XI 
  V., 
  that 
  only 
  the 
  Lamel- 
  

   libranchiata 
  form 
  a 
  large 
  and 
  characteristic 
  fauna. 
  All 
  the 
  other 
  

   groups 
  are 
  represented 
  by 
  one, 
  two, 
  or 
  three 
  species 
  each 
  ; 
  throughout 
  

   the 
  whole 
  of 
  the 
  10 
  localities 
  (5 
  Great 
  Oolite 
  and 
  5 
  Cornbrash), 
  only 
  a 
  

   single 
  Coral, 
  Anabacia 
  orbulites. 
  seems 
  to 
  have 
  been 
  recorded 
  in 
  any 
  

   Great-Oolite 
  or 
  Cornbrash 
  locality 
  : 
  with 
  the 
  exception 
  of 
  Rushden, 
  

   none 
  of 
  the 
  localities 
  have 
  yielded 
  any. 
  The 
  Echinodermata 
  

   found 
  in 
  the 
  Great 
  Oolite 
  are 
  only 
  Echinobrissus 
  clunicularis, 
  E. 
  

   sinuatus, 
  and 
  Pygaster 
  semisulcatus 
  ; 
  no 
  Crustacea, 
  Bryozoa, 
  Am- 
  

   monites, 
  or 
  Belemnites 
  have 
  been 
  recorded, 
  and 
  only 
  one 
  Nautilus 
  

   (N. 
  Babeii). 
  On 
  the 
  other 
  hand 
  the 
  Bivalve 
  Molluscan 
  fauna 
  is 
  large. 
  

   The 
  five 
  Great-Oolite 
  areas 
  yield 
  a 
  recurrent 
  fauna 
  of 
  75 
  genera, 
  or 
  a 
  

   mean 
  of 
  15 
  for 
  each 
  locality 
  ; 
  the 
  species 
  190, 
  or 
  40 
  for 
  each 
  of 
  the 
  

   five 
  localities. 
  This 
  shows 
  that 
  the 
  species 
  have 
  not 
  been 
  rigorously 
  

   searched 
  for. 
  We 
  may 
  say 
  that 
  the 
  Gasteropoda 
  are 
  hardly 
  repre- 
  

   sented 
  ; 
  for 
  we 
  know 
  of 
  only 
  5 
  species, 
  Natica 
  neritoidea, 
  N. 
  globosa, 
  

   Nerincea 
  funiculus, 
  N. 
  Voltzii, 
  and 
  a 
  Monodonta, 
  for 
  the 
  whole 
  5 
  

   localities. 
  The 
  Brachiopoda 
  are 
  individually 
  numerous, 
  but 
  the 
  species 
  

   few 
  : 
  the 
  two 
  genera 
  are 
  Terebratida 
  and 
  Bliynclionella 
  ; 
  8 
  species 
  

   are 
  all 
  that 
  have 
  occurred 
  in 
  both 
  genera. 
  

  

  * 
  See 
  the 
  clear 
  description 
  of 
  these 
  beds 
  in 
  Prof. 
  Judd's 
  memoir, 
  loc. 
  cit. 
  

   pp. 
  188-200, 
  with 
  reference 
  to 
  sheet 
  64 
  of 
  the 
  Geological-Survey 
  map. 
  

   t 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  ix. 
  p. 
  338. 
  

  

  