﻿54 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  40. 
  Turbinella 
  (Tudicula) 
  spinosa. 
  (Plate 
  V. 
  fig. 
  H.) 
  

  

  Tudicla 
  (Tudicula) 
  spinosa, 
  H. 
  <^- 
  A. 
  Adams, 
  Proc. 
  Zool. 
  Soc. 
  1863, 
  

   p. 
  4:29. 
  

  

  Hab. 
  Port 
  Curtis 
  {Coll. 
  Cuming) 
  ; 
  Prince 
  of 
  Wales 
  Channel, 
  

   Torres 
  Straits, 
  9 
  fms. 
  {Coppinger). 
  

  

  This 
  species 
  is 
  not 
  entirely 
  white 
  as 
  originally 
  described, 
  but 
  has 
  

   an 
  interrupted 
  zone 
  of 
  pale 
  brown 
  around 
  the 
  last 
  whorl 
  immediately 
  

   beneath 
  the 
  crown 
  of 
  short 
  hollow 
  spines 
  at 
  the 
  angle 
  towards 
  the 
  

   upper 
  part 
  of 
  the 
  whorl. 
  The 
  spines 
  correspond 
  in 
  number 
  and 
  

   position 
  with 
  the 
  longitudinal 
  rounded 
  plicte 
  (usually 
  averaging 
  

   about 
  eleven 
  or 
  twelve 
  on 
  the 
  last 
  whorl), 
  are 
  directed 
  obliquely 
  

   upwards 
  and 
  a 
  little 
  backward, 
  and 
  increase 
  in 
  length 
  with 
  the 
  

   growth 
  of 
  the 
  shell, 
  but 
  do 
  not 
  attain 
  any 
  thing 
  like 
  the 
  dimensions 
  

   of 
  some 
  in 
  the 
  preceding 
  species. 
  Messrs. 
  x\.dams 
  give 
  the 
  number 
  

   of 
  folds 
  on 
  the 
  columella 
  as 
  three 
  ; 
  whilst 
  in 
  three 
  out 
  of 
  four 
  speci- 
  

   mens 
  before 
  me 
  I 
  find 
  four, 
  of 
  which 
  the 
  two 
  lowermost 
  are 
  very 
  

   close 
  together 
  and 
  might 
  be 
  regarded 
  as 
  constituting 
  one 
  duplex 
  

   plait. 
  In 
  the 
  typo 
  specimen 
  this 
  feature 
  is 
  less 
  conspicuous, 
  still 
  a 
  

   slight 
  groove 
  subdivides 
  it. 
  The 
  second 
  or 
  central 
  fold 
  is 
  the 
  most 
  

   prominent 
  in 
  every 
  example. 
  The 
  lirae 
  within 
  the 
  aperture 
  ai'e 
  

   fine, 
  ten 
  or 
  eleven 
  in 
  number, 
  and 
  extend 
  into 
  the 
  interior 
  as 
  far 
  as 
  

   the 
  eye 
  can 
  reach. 
  The 
  columellar 
  callosity 
  is 
  free, 
  prominent, 
  and 
  

   joins 
  the 
  upper 
  extremity 
  of 
  the 
  labrum. 
  The 
  canal 
  is 
  remarkably 
  

   straight, 
  nearly 
  closed, 
  and 
  occupies 
  considerably 
  more 
  than 
  half 
  the 
  

   total 
  length 
  of 
  the 
  shell. 
  The 
  type 
  is 
  38 
  millim. 
  long 
  and 
  16 
  broad 
  

   at 
  the 
  periphery 
  ; 
  but 
  another 
  specimen 
  is 
  21 
  wide, 
  and 
  probably, 
  if 
  

   perfect, 
  would 
  have 
  a 
  length 
  of 
  50. 
  

  

  Mr. 
  Tryon's 
  supposition 
  that 
  this 
  species 
  (Man. 
  Con. 
  vol. 
  iii. 
  p. 
  144) 
  

   is 
  " 
  probably 
  identical 
  with 
  T. 
  armigcra 
  " 
  and 
  that 
  T. 
  inermis 
  

   (wrongly 
  attributed 
  to 
  Sowerby 
  instead 
  of 
  Angas) 
  " 
  is 
  simply 
  a 
  

   depauperated 
  specimen 
  of 
  tlie 
  same 
  species," 
  is 
  altogether 
  wrong, 
  all 
  

   three 
  being 
  undoubtedly 
  distinct. 
  

  

  41. 
  Mitra 
  proscissa, 
  var. 
  (Plate 
  V. 
  fig. 
  I.) 
  

  

  Heeve, 
  Conch. 
  Icon. 
  fig. 
  177; 
  Soiverhy, 
  Thes. 
  Conch, 
  pi. 
  355. 
  fig. 
  264, 
  

   and 
  pi. 
  356. 
  fig. 
  282. 
  

  

  Shell 
  ovately 
  fusiform, 
  acuminate 
  at 
  the 
  apex, 
  olive-brown, 
  

   irregularly 
  spotted 
  and 
  streaked 
  in 
  a 
  longitudinal 
  direction 
  with 
  

   white, 
  and 
  encircled 
  round 
  the 
  middle 
  of 
  the 
  last 
  whorl 
  with 
  a 
  zone 
  

   of 
  the 
  same 
  colour. 
  Volutions 
  about 
  10 
  ; 
  the 
  upper 
  ones 
  flat 
  at 
  

   the 
  sides, 
  separated 
  by 
  a 
  deep 
  subcanaliculate 
  suture, 
  strengthened 
  

   with 
  three 
  strong 
  spiral 
  costoe, 
  of 
  which 
  the 
  uppermost 
  is 
  a 
  trifle 
  the 
  

   thickest 
  and 
  situated 
  immediately 
  beneath 
  the 
  suture 
  ; 
  the 
  two 
  

   others 
  are 
  equidistant, 
  the 
  lowermost 
  leaving 
  a 
  furrow 
  between 
  it 
  

   and 
  the 
  suture 
  beneath. 
  The 
  iuterstices 
  are 
  rather 
  strongly 
  sculp- 
  

   tured 
  by 
  elevated 
  lines 
  of 
  growth. 
  Upon 
  a 
  portion 
  of 
  the 
  penulti- 
  

   mate 
  and 
  uj)on 
  the 
  body- 
  whorl 
  the 
  two 
  lower 
  of 
  these 
  three 
  ridges 
  

   become 
  double, 
  each 
  being 
  divided 
  by 
  a 
  shallow 
  groove, 
  and 
  the 
  

   uppermost 
  is 
  bipartite. 
  In 
  addition 
  to 
  these 
  the 
  last 
  whorl, 
  which 
  

   is 
  convex 
  at 
  the 
  sides, 
  is 
  encircled 
  by 
  a 
  fourth 
  duplex 
  costa, 
  and 
  

  

  