﻿396 
  

  

  MK. 
  H. 
  WOODS 
  ON 
  THE 
  MOLLTTSCA 
  

  

  [Aug. 
  1897, 
  

  

  The 
  fauna 
  of 
  the 
  Eeussiannm-zone 
  in 
  Bohemia 
  is 
  apparently 
  also 
  

   richer 
  than 
  in 
  our 
  own 
  country, 
  but 
  at 
  present 
  it 
  is 
  not 
  possible 
  in 
  

   all 
  cases 
  to 
  say 
  definitely 
  which 
  species 
  come 
  from 
  that 
  zone. 
  In 
  the 
  

   Tables 
  showing 
  the 
  range 
  of 
  the 
  mollusca 
  (facing 
  p. 
  394, 
  and 
  Part 
  I. 
  

   pp. 
  92, 
  93), 
  it 
  will 
  be 
  noticed 
  that 
  some 
  species, 
  which 
  in 
  other 
  

   areas 
  have 
  a 
  very 
  limited 
  range, 
  pass 
  through 
  all 
  or 
  nearly 
  all 
  the 
  

   divisions 
  in 
  Bohemia. 
  I 
  believe 
  that 
  these 
  divisions 
  (' 
  Weissen- 
  

   berg 
  Beds 
  ' 
  etc.) 
  are, 
  to 
  a 
  large 
  extent, 
  geographical, 
  rather 
  than 
  

   zonal, 
  in 
  character. 
  1 
  

  

  It 
  would 
  be 
  interesting 
  to 
  compare 
  the 
  English 
  fauna 
  with 
  the 
  

   Bavarian 
  ; 
  but 
  in 
  this 
  case 
  too 
  we 
  meet 
  with 
  a 
  difficulty, 
  since, 
  from 
  

   the 
  available 
  sources 
  of 
  information, 
  it 
  is 
  not 
  possible 
  to 
  separate 
  

   all 
  the 
  species 
  found 
  in 
  the 
  Pulverthurm 
  Beds 
  from 
  those 
  of 
  the 
  

   other 
  divisions 
  of 
  the 
  Kagerhoh 
  Beds. 
  

  

  As 
  might 
  be 
  expected, 
  there 
  is 
  no 
  important 
  difference 
  between 
  the 
  

   fauna 
  of 
  the 
  Reussianimi-zone 
  in 
  England 
  and 
  in 
  Northern 
  Erance. 
  

  

  I 
  believe 
  that 
  few, 
  if 
  any, 
  of 
  the 
  species 
  which 
  occur 
  in 
  the 
  

   Reussianum- 
  zone 
  have 
  been 
  identified, 
  without 
  doubt, 
  as 
  occurring 
  

   in 
  extra-European 
  areas, 
  although 
  some 
  have 
  certainly 
  ' 
  represen- 
  

   tative 
  forms 
  ' 
  elsewhere. 
  

  

  Turning 
  now 
  to 
  our 
  own 
  country, 
  we 
  find 
  that 
  the 
  feature 
  'which 
  

   has 
  struck 
  everyone 
  who 
  has 
  studied 
  this 
  zone 
  is 
  the 
  general 
  resem- 
  

   blance 
  of 
  its 
  fauna 
  to 
  that 
  of 
  the 
  Chalk 
  Marl. 
  — 
  First 
  : 
  ammonoids, 
  

   gasteropods, 
  and 
  certain 
  groups 
  of 
  lamellibranchs 
  are 
  abundant 
  at 
  

   both 
  horizons, 
  whereas 
  they 
  are 
  rare 
  or 
  absent 
  in 
  the 
  intervening 
  

   beds. 
  Secondly 
  : 
  some 
  species 
  are 
  common 
  to 
  the 
  Beussianum-zone 
  

   and 
  the 
  Cenomanian, 
  namely 
  : 
  — 
  

  

  Nautilus 
  sublcevigatus, 
  d'Orb. 
  

   Crioceras 
  ellipticum 
  (Mant.). 
  

   Emarginula 
  Sanctce- 
  Catharine 
  

   Pleurotomaria 
  perspectiva 
  (Mant.) 
  

   Turbo 
  gemmatus, 
  Sow. 
  

  

  Aporrkais 
  (Lispodesthes) 
  Mantelli, 
  

  

  Gard. 
  

   (?) 
  Inoceramus 
  striatus, 
  Mant. 
  

   Spondylitis 
  latus 
  (Sow.). 
  

   Arctica 
  quadrata 
  (d'Orb.). 
  

  

  Thirdly 
  : 
  allied 
  forms 
  occur 
  at 
  the 
  two 
  horizons, 
  e. 
  g. 
  Baculites 
  

   bohemicus, 
  Eritsch, 
  Scaphites 
  Geinitzi, 
  d'Orb., 
  and 
  Holaster 
  planus 
  

   (Mant.) 
  of 
  the 
  higher 
  zone, 
  are 
  closely 
  related 
  to 
  B. 
  baculoides, 
  

   Mant., 
  S. 
  obliquus, 
  Sow., 
  and 
  H. 
  trecensis, 
  Leym., 
  of 
  the 
  lower 
  zone. 
  

   In 
  England, 
  the 
  following 
  species 
  of 
  mollusca 
  are, 
  so 
  far 
  as 
  is 
  

   known 
  at 
  present, 
  confined 
  to 
  the 
  Reussianum-zone 
  : 
  — 
  

  

  Plychoceras 
  Smithi, 
  Woods. 
  

   Heteroceras 
  Beussianum, 
  d'Orb. 
  

  

  sp. 
  

   Baculites 
  bohemicus, 
  Fritsch. 
  

   Prionocyclus 
  Neptuni 
  (G-ein.). 
  

   Turbo 
  Geinitzi, 
  Woods. 
  

   Trochus 
  Schluteri, 
  Woods. 
  

  

  „ 
  berocscirensis, 
  Woods. 
  

   Natica 
  (Naticina) 
  vulgaris, 
  Reuss. 
  

   Cerithium 
  cuckhamsliense, 
  Woods. 
  

  

  ,, 
  Saundersi, 
  Woods. 
  

   Avellana 
  of. 
  Humboldti, 
  Mull. 
  

   Bentalium 
  turoniense, 
  Woods. 
  

   Nuculana 
  of. 
  siliqua 
  (Goldf.). 
  

  

  Area 
  cf. 
  Galliennei, 
  d'Orb. 
  

  

  „ 
  (Barbatid) 
  cf. 
  Geinitzi, 
  Reuss. 
  

   Lima 
  (Acesta 
  ?) 
  subabrupta, 
  d'Orb. 
  

   Plicatula 
  Barroisi, 
  Peron. 
  

   Cardium 
  turoniense, 
  Woods. 
  

   ,, 
  cf. 
  cenomanense, 
  d'Orb. 
  

   ,, 
  cf. 
  Mailleanum, 
  d'Orb. 
  

   Cardita 
  cancellata, 
  Woods. 
  

   Arctica? 
  equisulcata, 
  Woods. 
  

   Trapezium 
  trapezoidale 
  (Rom.). 
  

   ,, 
  rectangular 
  e, 
  Woods. 
  

  

  Corbis? 
  Morisoni, 
  Woods. 
  

   Martesia 
  ? 
  rotunda 
  (Sow.). 
  

   Cuspidaria 
  caudata 
  (Nilss.). 
  

  

  1 
  On 
  this 
  subject 
  see 
  J. 
  J. 
  Jahn, 
  ' 
  Einige 
  Beitrage 
  zur 
  Kenutniss 
  der 
  bohm. 
  

   Kreideformat.' 
  Jahrb. 
  d. 
  k.-k. 
  geol. 
  Reichsanst. 
  vol. 
  xlv. 
  (1895) 
  p. 
  125. 
  

  

  