﻿58 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Nov. 
  18, 
  

  

  that 
  better-preserved 
  specimens 
  would 
  render 
  necessary 
  some 
  altera- 
  

   tion 
  in 
  the 
  above 
  description. 
  

  

  As 
  regards 
  the 
  affinities 
  of 
  this 
  species, 
  it 
  requires 
  but 
  a 
  glance 
  at 
  

   pi. 
  28. 
  fig. 
  4. 
  of 
  d'Archiac 
  and 
  Haime's 
  ' 
  Description 
  des 
  Animaux 
  

   fossiles 
  du 
  Groupe 
  Nummulitique 
  de 
  l'lnde 
  ' 
  to 
  render 
  manifest 
  the 
  

   very 
  close 
  affinity 
  existing 
  between 
  Vicarya 
  Verneuilii, 
  d'Arch., 
  and 
  

   this 
  species 
  ; 
  the 
  differences 
  being 
  merely 
  those 
  of 
  detail 
  in 
  the 
  orna- 
  

   mentation, 
  and 
  of 
  form 
  and 
  size 
  in 
  the 
  callosity. 
  This 
  affinity 
  is 
  so 
  

   unquestionable 
  that 
  I 
  have 
  adopted 
  provisionally 
  the 
  genus 
  doubtfully 
  

   proposed 
  by 
  the 
  above-mentioned 
  authors 
  for 
  the 
  reception 
  of 
  the 
  

   Scindian 
  fossil, 
  but, 
  at 
  the 
  same 
  time, 
  reserve 
  any 
  opinion 
  as 
  to 
  the 
  

   claims 
  of 
  Vicarya 
  to 
  be 
  considered 
  as 
  a 
  distinct 
  genus. 
  It 
  may 
  be 
  

   observed, 
  in 
  passing, 
  that 
  the 
  Indian 
  shell 
  referred 
  by 
  Mr. 
  Hislop 
  

   to 
  the 
  genus 
  Vicarya* 
  appears 
  to 
  be 
  of 
  an 
  altogether 
  different 
  

   nature, 
  and 
  is 
  probably 
  allied 
  to 
  one 
  of 
  the 
  subgenera 
  of 
  Melania. 
  

  

  Dimensions. 
  — 
  Large 
  specimen 
  : 
  length 
  3-J- 
  inches, 
  breadth 
  (includ- 
  

   ing 
  callosity 
  and 
  tubercle) 
  1-| 
  inch; 
  breadth 
  of 
  last 
  whorl 
  1^ 
  inch; 
  

   length 
  of 
  aperture 
  -l 
  inch, 
  breadth 
  -^ 
  inch. 
  Small 
  specimen 
  : 
  length 
  

   (imperfect) 
  2^- 
  inches 
  ; 
  breadth 
  of 
  last 
  whorl 
  \^ 
  inch. 
  

  

  Matrix. 
  — 
  The 
  matrix 
  of 
  the 
  large 
  specimen 
  cannot 
  well 
  be 
  made 
  

   out 
  ; 
  that 
  of 
  the 
  small 
  one 
  is 
  a 
  greenish 
  -grey 
  sandy 
  marl. 
  

  

  13. 
  Tferitella 
  actjtictngttlata, 
  spec. 
  nov. 
  PI. 
  VII. 
  fig. 
  1. 
  

  

  Shell 
  turreted, 
  obtuse. 
  Whorls 
  very 
  finely 
  striated, 
  with 
  two 
  sharp 
  

   prominent 
  keels 
  in 
  the 
  central 
  region, 
  the 
  lower 
  one 
  being 
  the 
  more 
  

   prominent 
  ; 
  one 
  less 
  prominent 
  ridge 
  beneath, 
  and 
  occasionally 
  a 
  

   still 
  lower 
  one 
  masking 
  the 
  line 
  of 
  suture 
  ; 
  and 
  about 
  four 
  still 
  

   smaller 
  ridges 
  on 
  the 
  upper 
  part. 
  Interspaces 
  between 
  the 
  central 
  

   portions 
  of 
  the 
  adjacent 
  whorls 
  deeply 
  and 
  semicylindrically 
  ex- 
  

   cavated, 
  as 
  also 
  is 
  the 
  space 
  between 
  the 
  median 
  keels, 
  both 
  the 
  

   grooves 
  being 
  very 
  finely 
  and 
  spirally 
  striated 
  between, 
  and 
  parallel 
  

   to, 
  the 
  ridges. 
  Aperture 
  small, 
  ovate. 
  

  

  In 
  the 
  uppermost 
  portion 
  of 
  the 
  shell 
  the 
  suture 
  is 
  often 
  unaccom- 
  

   panied 
  by 
  the 
  ridge 
  which 
  marks 
  its 
  position 
  in 
  the 
  lower 
  portion 
  ; 
  

   it 
  is 
  then 
  neatly 
  impressed. 
  

  

  The 
  nearest 
  ally 
  to 
  this 
  species 
  is, 
  perhaps, 
  Turritella 
  Arcliimedis, 
  

   Bronn, 
  a 
  well-known 
  European 
  Miocene 
  shell 
  but 
  it 
  is 
  also 
  closely 
  

   related 
  to 
  T. 
  duplieata, 
  L., 
  an 
  equally 
  well-known 
  recent 
  species. 
  

   All 
  these 
  Shells 
  belong 
  to 
  the 
  same 
  type 
  of 
  Turritella 
  as 
  T. 
  angulata, 
  

   Sow., 
  which 
  MM. 
  d'Archiac 
  and 
  Haime 
  refer, 
  with 
  the 
  other 
  Soom- 
  

   row 
  fossils, 
  to 
  the 
  Nummulitic 
  formation, 
  thoug 
  1 
  Mr. 
  Sowerby 
  figured 
  

   and 
  described 
  them 
  as 
  " 
  Tertiary 
  " 
  in 
  contradistinction 
  to 
  " 
  Nummu- 
  

   litic." 
  The 
  beds, 
  also, 
  whence 
  they 
  were 
  obtained 
  were 
  described 
  

   under 
  the 
  same 
  title 
  by 
  Captain 
  Grant 
  f. 
  

  

  In 
  the 
  Society's 
  Museum 
  is 
  a 
  small 
  collection 
  of 
  fossils 
  from 
  Bengal, 
  

   presented 
  and 
  described 
  (as 
  regards 
  their 
  locality, 
  &c.) 
  by 
  H. 
  J. 
  Cole- 
  

   brooke, 
  Esq. 
  J, 
  which 
  contains 
  a 
  few 
  very 
  imperfect 
  specimens 
  of 
  a 
  

  

  * 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xvi. 
  p. 
  177, 
  pi. 
  8. 
  figs. 
  36 
  a, 
  36 
  c. 
  . 
  

   t 
  Geol. 
  Trans. 
  2nd 
  ser. 
  vol. 
  v. 
  pp. 
  289 
  et 
  seq. 
  

   X 
  Ibid. 
  vol. 
  i. 
  pp. 
  132 
  et 
  seq. 
  

  

  