﻿612 
  MR. 
  G. 
  W. 
  LAMPLUGH 
  OX 
  THE 
  

  

  sionally 
  found 
  in 
  the 
  same 
  zone 
  which 
  closely 
  resembles 
  the 
  species 
  

   known 
  in 
  the 
  Oolites 
  as 
  Bel. 
  sulcatus, 
  and 
  a 
  solitary 
  example 
  of 
  the 
  

   same 
  form 
  has 
  been 
  noted 
  in 
  the 
  zone 
  of 
  Bel. 
  jaculum 
  (see 
  p. 
  592). 
  

  

  BeLEMXITES 
  MIXIMES, 
  List. 
  ; 
  B. 
  ATTEXTJATUS, 
  SOW. 
  

  

  I 
  have 
  not 
  found 
  these 
  Belemnites 
  lower 
  in 
  the 
  section 
  than 
  the 
  

   marls 
  immediately 
  below 
  the 
  Red 
  Chalk. 
  As 
  Phillips 
  includes 
  them 
  

   in 
  his 
  list 
  of 
  Speeton-Clay 
  fossils, 
  and 
  as 
  specimens 
  occur 
  in 
  most 
  of 
  

   the 
  old 
  collections, 
  it 
  would 
  appear 
  that 
  the 
  uppermost 
  " 
  passage- 
  

   beds" 
  in 
  which 
  these 
  occur 
  have 
  long 
  been 
  known, 
  though 
  the 
  

   distinction 
  between 
  them 
  and 
  the 
  underlying 
  clays 
  has 
  not 
  always 
  

   been 
  recognized. 
  

  

  Ammoxites. 
  

  

  Individually 
  this 
  genus 
  is 
  not 
  nearly 
  so 
  abundantly 
  represented 
  

   in 
  the 
  Speeton 
  Clay 
  as 
  Belemnites, 
  though 
  the 
  number 
  of 
  species 
  is 
  

   much 
  greater. 
  They 
  become 
  rarer 
  as 
  we 
  ascend 
  in 
  the 
  section, 
  and 
  

   are 
  very 
  scarce 
  in 
  the 
  zone 
  of 
  Bel. 
  semicanaliculatus 
  ? 
  

  

  Ammonites 
  Gravesiaxes, 
  D'Orb. 
  ; 
  A. 
  Iries, 
  D'Orb. 
  

  

  This 
  species 
  or 
  group 
  of 
  species 
  (Am. 
  quadrijidus, 
  Bean, 
  MS., 
  and 
  

   Am. 
  cavaticus, 
  Bean, 
  MS., 
  of 
  the 
  old 
  collectors) 
  occurs 
  only, 
  so 
  far 
  

   as 
  I 
  know, 
  in 
  the 
  zone 
  of 
  Bel. 
  lateralis. 
  They 
  are 
  considered 
  as 
  

   Portlandian 
  forms, 
  but 
  it 
  has 
  been 
  stated 
  in 
  a 
  recent 
  paper 
  that 
  

   their 
  determination 
  is 
  uncertain. 
  M. 
  Serge 
  Mkitin, 
  the 
  author 
  of 
  

   the 
  paper 
  in 
  question, 
  has 
  very 
  kindly 
  furnished 
  me 
  with 
  the 
  follow- 
  

   ing 
  translation 
  of 
  the 
  passage 
  in 
  his 
  work 
  (' 
  Quelques 
  Excursions 
  

   en 
  Europe 
  occidentale,' 
  par 
  S. 
  i^ikitin 
  : 
  St. 
  Petersburg, 
  1889 
  ; 
  pub- 
  

   lished 
  in 
  Russian) 
  in 
  which 
  he 
  refers 
  to 
  them 
  : 
  — 
  " 
  En 
  etudiant 
  les 
  

   musees 
  de 
  York 
  et 
  de 
  Scarborough 
  je 
  n'ai 
  pas 
  reussi 
  d'y 
  voir 
  les 
  

   Ammonites 
  cite'es 
  par 
  Judd 
  ; 
  au 
  contraire, 
  tout 
  ce 
  qui 
  est 
  decrit 
  et 
  

   determine 
  dans 
  ces 
  musees 
  sous 
  les 
  noms 
  d' 
  Ammonites 
  Gravesianus, 
  

   Amm. 
  gigas, 
  et 
  en 
  partie 
  Amm. 
  triplicates 
  sont 
  les 
  formes 
  epaisses 
  

   (VOlcostephani 
  du 
  groupe 
  BidicJiotomi 
  decrits 
  par 
  MM. 
  JNeumayr 
  et 
  

   Uhlig 
  (' 
  Pakeontographica,' 
  xxvii.) 
  des 
  depots 
  neocomiens 
  du 
  Hils 
  

   allemand, 
  comme 
  par 
  ex. 
  Olc. 
  Keyserlingi, 
  marginatum, 
  multiplicatus, 
  

   etc. 
  Je 
  suppose 
  que 
  ces 
  formes 
  tirent 
  leur 
  origine, 
  comme 
  nous 
  le 
  

   verrons 
  ensuite, 
  d'un 
  des 
  horizons 
  superieurs 
  de 
  l'argile 
  de 
  Speeton, 
  

   mais 
  pas 
  de 
  dessous 
  de 
  la 
  couche 
  a 
  Coprolithes 
  " 
  *. 
  

  

  Since, 
  however, 
  I 
  have 
  now 
  shown 
  that 
  these 
  forms 
  occur 
  in 
  that 
  

   portion 
  of 
  the 
  Speeton 
  section 
  which 
  the 
  Russian 
  geologists 
  concur 
  

   in 
  synchronizing 
  with 
  their 
  " 
  Upper 
  Yolga 
  beds," 
  we 
  may 
  take 
  it 
  

   that 
  their 
  age 
  is 
  satisfactorily 
  established. 
  

  

  By 
  far 
  the 
  finest 
  collection 
  of 
  these 
  Ammonites 
  extant 
  is 
  that 
  

   made 
  by 
  Leckenby, 
  now 
  in 
  the 
  Woodwardian 
  Museum 
  at 
  Cambridge. 
  

  

  * 
  Since 
  my 
  paper 
  was 
  read 
  the 
  full 
  text 
  of 
  M. 
  Kikitin's 
  valuable 
  paper 
  has 
  

   become 
  available 
  through 
  tbe 
  French 
  translation, 
  to 
  which 
  reference 
  has 
  already 
  

   been 
  given. 
  The 
  above 
  passage 
  will 
  be 
  found 
  at 
  p. 
  39 
  of 
  that 
  work. 
  

  

  