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  PROCEEDINGS 
  OF 
  THE 
  MALA.COL0GH0AL 
  SOCIETY. 
  

  

  Accordingly 
  the 
  solution 
  of 
  a 
  few 
  of 
  the 
  more 
  tangible 
  species 
  is 
  much 
  

   to 
  be 
  commended, 
  which, 
  by 
  being 
  well 
  figured 
  and 
  often 
  redescribed, 
  

   though 
  still, 
  of 
  course, 
  retaining 
  the 
  Adamsian 
  ' 
  cognomina 
  ', 
  are 
  thus 
  

   raised 
  upon 
  a 
  higher 
  platform, 
  and 
  cease 
  to 
  be 
  such 
  severe 
  stumbling- 
  

   blocks 
  to 
  the 
  student 
  as 
  heretofore. 
  We 
  wish 
  it 
  were 
  possible 
  to 
  place 
  

   all 
  this 
  author's 
  deep-sea 
  species 
  — 
  between 
  five 
  and 
  six 
  hundred 
  is 
  

   the 
  total 
  of 
  mostly 
  minute 
  shells 
  — 
  upon 
  as 
  satisfactory 
  a 
  basis. 
  

  

  The 
  affinities 
  of 
  the 
  Persian 
  Gulf 
  and 
  Arabian 
  Sea 
  Pyramidellidse 
  

   lie, 
  as 
  might 
  be 
  expected, 
  with 
  those 
  of 
  the 
  Erythraean 
  fauna, 
  while 
  

   many 
  very 
  similar, 
  but 
  always 
  to 
  be 
  differentiated, 
  exist 
  in 
  the 
  

   Mediterranean. 
  

  

  In 
  a 
  paper 
  published 
  lately 
  ^ 
  it 
  was 
  found 
  by 
  a 
  tabular 
  comparison 
  

   that, 
  of 
  475 
  species 
  of 
  Mollusca 
  collected 
  during 
  the 
  Stanley 
  Gardiner 
  

   Expedition 
  in 
  the 
  Amirantes, 
  Seychelles, 
  Cargados, 
  and 
  Chagos 
  

   Archipelago, 
  all 
  in 
  the 
  South 
  Indian 
  Ocean, 
  but 
  little 
  more 
  than 
  

   a 
  quarter 
  were 
  known 
  to 
  exist 
  in 
  the 
  Persian 
  Gulf. 
  It 
  has 
  long 
  

   been 
  my 
  theory 
  that 
  the 
  course 
  of 
  the 
  currents, 
  coupled 
  with 
  the 
  

   geographical 
  configuration, 
  tend 
  in 
  making 
  the 
  gulf 
  a 
  ' 
  cul-de-sac 
  ', 
  

   and 
  thus 
  the 
  creation 
  of 
  endemic 
  forms 
  is 
  favoured. 
  The 
  exceptionally 
  

   prolific 
  dredging 
  made 
  at 
  156 
  fathoms 
  in 
  the 
  Gulf 
  of 
  Oman 
  in 
  1903 
  

   was 
  not 
  only 
  memorable 
  for 
  the 
  vast 
  amount 
  of 
  new 
  minute 
  forms 
  

   of 
  shells, 
  for 
  Prof. 
  Sydney 
  J. 
  Hickson, 
  F.K.S., 
  is 
  describing 
  this 
  year 
  

   a 
  new 
  genus 
  and 
  species 
  {PyrophylUa 
  inflata) 
  of 
  solitary 
  Octoradiate 
  

   Corals 
  from 
  this 
  locality, 
  and 
  several 
  other 
  similar 
  organisms 
  await 
  

   differentiation. 
  Many 
  of 
  the 
  fishes, 
  too, 
  procured 
  by 
  Mr. 
  Townsend 
  

   in 
  the 
  immediate 
  neighbourhood 
  proved 
  new 
  to 
  science. 
  

  

  In 
  the 
  following 
  catalogue 
  I 
  have 
  to 
  some 
  extent 
  adopted 
  the 
  

   sequence 
  of 
  species 
  as 
  given 
  in 
  the 
  former 
  list. 
  From 
  motives 
  of 
  

   convenience, 
  the 
  species 
  are 
  placed 
  in 
  alphabetical 
  order, 
  and 
  I 
  have 
  not 
  

   ventured 
  to 
  subdivide 
  the 
  Turlonillce 
  into 
  sections. 
  I 
  have 
  considered 
  

   Pyrgulina 
  a 
  proper 
  genus 
  as 
  distinct 
  from 
  Odostomia 
  ; 
  and 
  under 
  

   Syrnola 
  still 
  retain 
  certain 
  elongate 
  Odostomoid 
  forms 
  which 
  some 
  

   authors 
  would 
  perhaps 
  place 
  in 
  the 
  latter 
  genus. 
  Of 
  six 
  or 
  seven 
  

   species 
  which 
  have 
  been 
  insufficiently 
  figured, 
  I 
  have 
  taken 
  the 
  

   opportunity 
  of 
  giving 
  more 
  presentable 
  likenesses, 
  which 
  I 
  trust 
  may 
  

   be 
  useful. 
  It 
  had 
  been 
  thought 
  that 
  the 
  Eulimidse 
  might 
  be 
  also 
  

   included 
  in 
  this 
  paper, 
  as 
  completing 
  the 
  Gymnoglossa, 
  but 
  revision 
  

   does 
  not 
  seem 
  so 
  necessary 
  here 
  : 
  there 
  are 
  but 
  few 
  additions, 
  and 
  

   fewer 
  new 
  localities 
  to 
  add 
  or 
  comments 
  to 
  make. 
  Accordingly 
  this 
  

   idea 
  has 
  not 
  been 
  carried 
  into 
  efltect. 
  

  

  I 
  would 
  just 
  add 
  that 
  it 
  is 
  well 
  to 
  recapitulate 
  here 
  the 
  lines 
  of 
  

   demarcation 
  proposed 
  at 
  first 
  for 
  the 
  limitation 
  of 
  the 
  terms 
  ' 
  Persian 
  

   Gulf 
  and 
  'North 
  Arabian 
  Sea'. 
  While 
  the 
  whole 
  of 
  the 
  Gulf 
  and 
  

   of 
  the 
  Gulf 
  of 
  Oman 
  is 
  included, 
  only 
  that 
  portion 
  of 
  the 
  Arabian 
  Sea 
  

   is 
  embraced 
  which 
  lies 
  north 
  of 
  an 
  imaginary 
  line 
  running 
  obliquely 
  

   from 
  Ras-el-Hadd, 
  south-east 
  of 
  Maskat 
  (Muscat), 
  to 
  Panjim 
  on 
  the 
  

   Indian 
  coast. 
  This 
  includes 
  not 
  only 
  Bombay 
  and 
  Ratnagiri, 
  but 
  also 
  

   the 
  Angrias 
  Bank. 
  

  

  ^ 
  Trans. 
  Linn. 
  Soc. 
  Lond., 
  Zoology, 
  ser. 
  ii, 
  vol. 
  xiii, 
  pt. 
  vi, 
  pp. 
  65-138, 
  pi. 
  vi, 
  1909. 
  

  

  