﻿138 
  

  

  NOTE 
  ON 
  THE 
  TYPE-SPECIMEN 
  OF 
  CRIOCERATITES 
  

   BOWERBANKII, 
  J. 
  DE 
  C. 
  SOWERBY.^ 
  

  

  By 
  G. 
  C. 
  Crick, 
  F.G.S., 
  F.Z.S. 
  

  

  Read 
  12th 
  January, 
  1917. 
  

  

  PLATE 
  VII. 
  

  

  The 
  type-specimen 
  of 
  Crioceratites 
  howerbmikii, 
  formerly 
  in 
  the 
  

   Bowerbank 
  Collection, 
  now 
  forms 
  part 
  of 
  the 
  British 
  Musenm 
  

   collection 
  [Brit. 
  Miis. 
  No. 
  46474]. 
  The 
  present 
  writer's 
  attention 
  was 
  

   directed 
  to 
  it 
  recently 
  in 
  connexion 
  with 
  the 
  description 
  - 
  of 
  an 
  

   ammonoid, 
  Ammonitoceras 
  tovilense, 
  from 
  the 
  Lower 
  Greensand 
  ( 
  Aptian) 
  

   of 
  Kent, 
  and 
  two 
  or 
  three 
  features 
  about 
  the 
  specimen 
  that 
  had 
  not 
  

   hitherto 
  been 
  recorded 
  seem 
  to 
  deserve 
  notice. 
  

  

  Sowerby's-' 
  description 
  of 
  the 
  fossil 
  was 
  communicated 
  to 
  the 
  

   Geological 
  Society 
  of 
  London 
  in 
  a 
  letter 
  which 
  was 
  read 
  on 
  

   IVfarch 
  8th, 
  1837. 
  In 
  his 
  letter 
  Sowerby 
  writes: 
  "The 
  recent 
  

   discovery 
  in 
  the 
  Isle 
  of 
  Wight, 
  by 
  Air. 
  Bowerbank, 
  of 
  a 
  fossil 
  shell 
  

   resembling 
  Ammonites, 
  but 
  differing 
  essentially 
  from 
  that 
  genus, 
  and 
  

   of 
  a 
  magnificent 
  Scaphites, 
  appears 
  to 
  me 
  of 
  sufficient 
  importance 
  to 
  

   be 
  laid 
  before 
  the 
  Geological 
  Society 
  ; 
  I 
  have, 
  therefore, 
  drawn 
  up 
  the 
  

   following 
  descriptions, 
  accompanied 
  by 
  reduced 
  figures 
  of 
  the 
  fossils. 
  

   pi. 
  xxxiv." 
  

  

  His 
  description 
  of 
  Crioceratites 
  bowerhankii 
  is 
  as 
  follows: 
  "The 
  

   gigantic 
  species 
  from 
  the 
  Isle 
  of 
  Wight 
  I 
  shall 
  name, 
  after 
  its 
  

   discoverer, 
  Crioceratites 
  howerbankii, 
  pi. 
  xxxvi, 
  fig. 
  1. 
  Spec. 
  Char. 
  — 
  

   Whorls 
  about 
  four, 
  slightly 
  flattened 
  on 
  their 
  sides, 
  and 
  nearly 
  close 
  ; 
  

   the 
  inner 
  one 
  ornamented 
  with 
  numerous 
  radiating 
  furrows, 
  which, 
  

   gradually 
  disappearing 
  upon 
  the 
  outer 
  whorl, 
  are 
  replaced 
  by 
  eight 
  

   or 
  ten 
  thick, 
  arched 
  costse, 
  extending 
  completely 
  across 
  the 
  whorl, 
  

   and 
  largest 
  and 
  most 
  elevated 
  towards 
  the 
  thinly 
  edged, 
  transversely 
  

   oblong 
  aperture. 
  

  

  "The 
  septa 
  are 
  rather 
  distant, 
  terminating 
  where 
  the 
  costas 
  begin 
  

   to 
  enlarge. 
  There 
  is 
  generally 
  a 
  short 
  rib 
  almost 
  close 
  to 
  the 
  

   aperture, 
  and 
  in 
  one 
  specimen 
  I 
  have 
  noticed 
  an 
  additional 
  short 
  

   rib 
  between 
  the 
  two 
  long 
  ones 
  which 
  precede 
  the 
  termination. 
  In 
  an 
  

   individual 
  sixteen 
  inches 
  wide, 
  the 
  septa 
  are 
  ones 
  inch 
  and 
  a 
  half 
  apart. 
  

  

  "The 
  fossil 
  occurs 
  in 
  the 
  lower 
  green 
  sand 
  on 
  the 
  south 
  coast 
  of 
  

   the 
  Isle 
  of 
  Wight." 
  

  

  The 
  type-specimen 
  is 
  very 
  well 
  represented 
  in 
  Sowerby's 
  

   figure, 
  the 
  enormous 
  enlargement 
  of 
  the 
  ribs 
  on 
  the 
  body-chamber 
  

   being 
  well 
  shown. 
  Of 
  these 
  ribs, 
  and 
  counting 
  from 
  the 
  aperture, 
  

   the 
  tvvo 
  largest 
  are 
  the 
  third 
  and 
  fifth, 
  the 
  fourth 
  is 
  a 
  trifle 
  

  

  ^ 
  Published 
  by 
  permission 
  of 
  the 
  Trustees 
  of 
  the 
  British 
  Museum 
  (Nat. 
  Hist.). 
  

   2 
  G. 
  C. 
  Crick, 
  Proc. 
  Malac. 
  Soc, 
  vol. 
  xii, 
  November, 
  1916, 
  pp. 
  118-20, 
  pi. 
  vi. 
  

   ^ 
  "Letter 
  from 
  Mr. 
  James 
  de 
  Caile 
  Sowerby 
  to 
  the 
  Secretary, 
  on 
  the 
  Genus 
  

  

  Crioceratites 
  and 
  on 
  Scaphites 
  gigas 
  " 
  : 
  Trans. 
  Geol. 
  Soc. 
  London, 
  ser. 
  ir, 
  

  

  vol. 
  iv, 
  p. 
  409, 
  pi. 
  xxxiv. 
  

  

  