﻿MOLLTJSCA, 
  37 
  

  

  In 
  form 
  the 
  specimen 
  obtained 
  by 
  Dr, 
  Coppinger 
  agrees 
  to 
  a 
  great 
  

   extent 
  with 
  G. 
  acnleiformis, 
  Reeve, 
  but 
  almost 
  entirely 
  lacks 
  the 
  

   lateral 
  inclination 
  of 
  the 
  anterior 
  narrowed 
  extremity. 
  The 
  spiral 
  

   sulci 
  on 
  the 
  body-whorl 
  are 
  narrower, 
  and 
  exhibit 
  a 
  decidedly 
  less 
  

   amount 
  of 
  subpunctate 
  sculpture 
  caused 
  by 
  the 
  impressed 
  lines 
  of 
  

   growth. 
  The 
  raised 
  interstices 
  are 
  markedly 
  flatter 
  and 
  broader, 
  

   and 
  do 
  not 
  exhibit 
  the 
  brown 
  dotting 
  so 
  characteristic 
  of 
  Reeve's 
  

   species. 
  These 
  differences 
  may 
  probably 
  be 
  accounted 
  for 
  by 
  the 
  

   younger 
  state 
  of 
  the 
  single 
  specimen 
  from 
  the 
  Arafura 
  Sea, 
  which, 
  

   being 
  dredged 
  in 
  a 
  dead 
  condition, 
  has 
  in 
  a 
  great 
  degree 
  lost 
  its 
  

   coloration. 
  The 
  spire 
  offers 
  scarcely 
  any 
  differences, 
  the 
  propor- 
  

   tionate 
  height, 
  the 
  coronation 
  of 
  three 
  or 
  four 
  whorls 
  succeeding 
  the 
  

   smooth 
  glossy 
  nucleus, 
  the 
  smooth 
  ridge 
  immediately 
  below 
  the 
  

   suture, 
  the 
  finer 
  lira 
  beneath 
  it 
  in 
  the 
  concavity 
  of 
  the 
  whorls, 
  and 
  

   the 
  elevated 
  margin 
  beneath 
  this 
  being 
  precisely 
  as 
  in 
  the 
  larger 
  

   shell 
  described 
  by 
  Reeve, 
  with 
  the 
  exception 
  of 
  the 
  ridge 
  beneath 
  

   the 
  suture, 
  which 
  is 
  rather 
  broader 
  and 
  more 
  flattened. 
  

  

  3. 
  Terebra 
  exigua. 
  

  

  Deshayes, 
  Proc. 
  Zool. 
  Soc. 
  1859, 
  p. 
  301 
  ; 
  Reeve, 
  Conch. 
  Icon. 
  pi. 
  26. 
  

   fig. 
  84. 
  

  

  Hah. 
  Thursday 
  Island, 
  Torres 
  Straits 
  {Coppinger); 
  East 
  xiustra- 
  

   livi'i 
  Desha 
  lies) 
  ; 
  Andaman 
  Islands 
  (Colonel 
  Wihner 
  in 
  Brit. 
  Mus.). 
  

  

  The 
  type 
  of 
  this 
  species 
  is 
  described 
  as 
  having 
  a 
  length 
  of 
  19 
  

   millimetres, 
  but 
  the 
  single 
  shell 
  in 
  the 
  Cumingian 
  collection 
  is 
  scarcely 
  

   15 
  long. 
  One 
  from 
  the 
  Andaman 
  Islands 
  measures 
  21 
  millimetres, 
  

   and 
  the 
  one 
  now 
  recorded 
  from 
  Torres 
  Straits 
  exceeds 
  that 
  in 
  length 
  

   by 
  four. 
  

  

  4. 
  Pleurotoma 
  (Drillia) 
  torresiana. 
  (Plate 
  IV. 
  figs. 
  D-D 
  1.) 
  

  

  Shell 
  fusiform, 
  strong, 
  robust, 
  longitudinally 
  costate 
  and 
  spirally 
  

   Urate, 
  having 
  the 
  ribs 
  white 
  or 
  yellow, 
  stained 
  either 
  with 
  bright 
  

   red 
  or 
  brownish 
  black 
  in 
  the 
  interstices, 
  and 
  ornamented 
  with 
  two 
  

   bands 
  of 
  the 
  same 
  colour 
  upon 
  the 
  last 
  whorl. 
  Volutions 
  12, 
  having 
  

   a 
  duplex 
  wavy 
  ridge 
  above, 
  beneath 
  which 
  they 
  are 
  excavated 
  and 
  

   then 
  convex 
  at 
  the 
  sides 
  ; 
  the 
  concavity 
  is 
  rather 
  deep 
  and 
  traversed 
  

   by 
  three 
  or 
  four 
  spiral 
  strioe. 
  The 
  costa3 
  are 
  obsolete 
  in 
  the 
  con- 
  

   cavity, 
  a 
  trifle 
  oblique, 
  thickest 
  above, 
  attenuating 
  inferior^, 
  

   thirteen 
  in 
  number 
  on 
  the 
  last 
  two 
  whorls, 
  two 
  of 
  them 
  on 
  each 
  

   being 
  large 
  swollen 
  white 
  varices. 
  The 
  ribs 
  are 
  crossed 
  by 
  spiral 
  

   lime, 
  there 
  being 
  seven 
  or 
  eight 
  on 
  the 
  penultimate, 
  and 
  about 
  

   twenty-four 
  on 
  the 
  last 
  whorl, 
  besides 
  one 
  or 
  more 
  finer 
  ones 
  in 
  the 
  

   interstices 
  between 
  them. 
  The 
  columella 
  is 
  smooth, 
  covered 
  with 
  a 
  

   thin 
  callus, 
  developed 
  into 
  a 
  tubercle 
  at 
  the 
  upper 
  part. 
  Labral 
  

   sinus 
  deepishin 
  the 
  concavity 
  above. 
  Length 
  34 
  millim., 
  width 
  10; 
  

   aperture 
  13 
  long. 
  

  

  Bah. 
  Friday 
  Island, 
  Torres 
  Straits, 
  and 
  Prince 
  of 
  Wales 
  Channel, 
  

   7-9 
  fathoms. 
  

  

  