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  DESCRIPTION 
  OF 
  BATHYTOMA 
  REGNANS, 
  N.SP., 
  FEOM 
  THE 
  

   INDIAN 
  OCEAN. 
  

  

  By 
  James 
  Cosmo 
  Meltill, 
  M.A., 
  D.Sc. 
  

  

  Eead 
  10th 
  May, 
  1918. 
  

   Bathyxoma 
  kkgnans, 
  n.sp. 
  

   B. 
  testa 
  fusiformi, 
  calcarea, 
  pallide 
  cinereo- 
  

   stramiiiea, 
  solidiila, 
  pulchenime 
  sculpturata, 
  

   anfractibus 
  9, 
  quorum 
  apicales 
  duo 
  globulares, 
  

   Isevissimi, 
  ca3teris 
  ad 
  suturas 
  anguste 
  sed 
  profunde 
  

   canaliculatis, 
  infra, 
  juxta 
  suturas, 
  longitudinaliter 
  

   irregulariter 
  arete 
  striatis, 
  deinde 
  apud 
  peripheriam 
  

   tuniide 
  angulatis, 
  spiraliter 
  ad 
  angulum 
  creberrime 
  

   cresceuti-tuberculatis, 
  imbricatulis, 
  ultimo 
  anfractu 
  

   caeteros 
  exoequante, 
  infra 
  peripheriam 
  spiraliter 
  

   crebrilirato, 
  liris 
  ad 
  15, 
  supernis 
  parvi-tuberculatis, 
  

   simul 
  ac 
  lineis 
  incrementalibus 
  longitudinaliter 
  

   irregulariter 
  prajditis, 
  apertura 
  anguste 
  oblonga, 
  

   labro 
  unanguluto, 
  paullum 
  flexuoso, 
  columella 
  alba, 
  

   nitidiuscula, 
  ad 
  medium 
  tuberculo-plicata, 
  sinu 
  

   perobscuro, 
  canali 
  brevi, 
  recurvo. 
  

   Long. 
  30, 
  lat. 
  12 
  mm. 
  

  

  JTab. 
  — 
  Indian 
  Ocean. 
  Investigator 
  Expedition 
  (Alcock). 
  

   A 
  very 
  elaborately 
  sculptured 
  member 
  of 
  the 
  Turridae, 
  which 
  

   upon 
  more 
  than 
  one 
  occasion 
  I 
  have 
  closely 
  examined 
  with 
  the 
  late 
  

   Mr. 
  Edgar 
  Smith, 
  and 
  agreed 
  that 
  the 
  genus 
  Bathytoma, 
  Harris 
  & 
  

   Burrows, 
  was 
  the 
  most 
  fitting 
  for 
  its 
  reception. 
  This 
  was 
  estab- 
  

   lished 
  in 
  1891, 
  llurex 
  cataphractus, 
  Brocchi,' 
  a 
  fossil 
  form, 
  being 
  

   the 
  type. 
  There 
  is, 
  doubtless, 
  a 
  close 
  alliance 
  with 
  Surcula, 
  

   H. 
  &"^A. 
  Adams. 
  

  

  Dr. 
  W. 
  H. 
  Dall- 
  includes 
  the 
  fine 
  species 
  Surcula 
  carpenteriana, 
  

   Gabb, 
  from 
  California,^ 
  and 
  its 
  near 
  allies, 
  tryoni, 
  Gabb, 
  gahhiana, 
  

   Dall, 
  as 
  typical 
  Bathytomce. 
  I 
  consider 
  B. 
  regnans 
  is 
  very 
  nearly 
  

   allied 
  also 
  to 
  Genotia 
  luhdorji, 
  Lischke, 
  from 
  Japan, 
  a 
  fine 
  and 
  still 
  

   uncommon 
  species, 
  with 
  somewhat 
  similar 
  sculpture, 
  though 
  hardly 
  

   so 
  elaborated. 
  

  

  The 
  exact 
  locality 
  of 
  this 
  species, 
  dredged 
  at 
  considerable 
  depth 
  

   during 
  the 
  cruise 
  of 
  S.S. 
  Investigator, 
  is 
  unknown, 
  but 
  it 
  probably 
  

   comes 
  from 
  the 
  Bay 
  of 
  Bengal. 
  It 
  is 
  in 
  dead 
  condition, 
  but 
  fairly 
  

   perfect, 
  and 
  was 
  given 
  by 
  Dr. 
  Alcock 
  to 
  Mr. 
  F. 
  W. 
  Townsend, 
  who 
  

   in 
  his 
  turn 
  was 
  kind 
  enough 
  to 
  present 
  it 
  to 
  me 
  in 
  1910. 
  

  

  ^ 
  Harris 
  & 
  Burrows, 
  Eocene 
  and 
  Oligocene, 
  Pai'is 
  Basin, 
  p. 
  113. 
  

  

  - 
  Dall, 
  "Miocene 
  of 
  Astoria 
  and 
  Coos 
  Bay, 
  Oregon" 
  : 
  Professional 
  Paper 
  U.S. 
  

  

  Geol. 
  Surv., 
  No. 
  59, 
  1909, 
  p. 
  27. 
  

   ^ 
  Proc. 
  California 
  Acad. 
  Sci., 
  iii, 
  1865, 
  p. 
  183. 
  

  

  