﻿64 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  C. 
  pupa, 
  and 
  C. 
  petrosum, 
  may 
  be 
  recognized 
  in 
  all 
  its 
  forms 
  by 
  the 
  

   oblique 
  varix 
  on 
  the 
  back 
  of 
  the 
  body-whorl, 
  a 
  feature 
  not 
  found 
  in 
  

   C. 
  morns 
  and 
  C.patiens 
  ( 
  = 
  7-iif/osum). 
  The 
  typical 
  form 
  and 
  the 
  

   variety 
  G. 
  variegatum 
  are 
  pupit'orm, 
  having 
  the 
  sjiire 
  acutely 
  conical 
  

   towards 
  the 
  apex 
  and 
  the 
  last 
  whorl 
  scarcely 
  broader 
  than 
  the 
  

   preceding 
  one. 
  The 
  granulations 
  appear 
  to 
  be 
  never 
  in 
  more 
  than 
  

   three 
  rows 
  on 
  the 
  upper 
  whorls, 
  but 
  on 
  the 
  penultimate 
  a 
  fourth 
  is 
  

   frequently, 
  but 
  not 
  always, 
  observable 
  adjoining 
  the 
  lower 
  suture. 
  

   The 
  bodj'-whorl 
  has 
  normally 
  seven 
  principal 
  series 
  of 
  granules 
  ; 
  

   bub 
  in 
  many 
  instances 
  the 
  minor 
  or 
  intermediate 
  series 
  attain 
  as 
  

   large 
  a 
  size 
  as 
  the 
  principal 
  ones, 
  when 
  the 
  number 
  of 
  rows 
  may 
  be 
  

   nine 
  to 
  a 
  dozen 
  or 
  even 
  more. 
  The 
  variations 
  in 
  colour 
  are 
  consider- 
  

   able 
  : 
  normal 
  specimens 
  are 
  whitish 
  varied 
  with 
  black, 
  brown, 
  and 
  

   white 
  tubercles. 
  

  

  The 
  var. 
  variegatuyn 
  is 
  irregularly 
  blotched 
  with 
  light 
  or 
  dark 
  

   brown, 
  and 
  some 
  specimens 
  are 
  almost 
  entirely 
  of 
  a 
  uniform 
  dark 
  

   brown 
  (Couch. 
  Icon. 
  fig. 
  41 
  a). 
  Another 
  has 
  a 
  light 
  brown 
  band 
  im- 
  

   mediately 
  beneath 
  the 
  suture 
  and 
  a 
  second 
  broader 
  one 
  at 
  the 
  base 
  

   of 
  the 
  body-whorl, 
  as 
  in 
  C. 
  p?<pa 
  (Conch. 
  Icon. 
  fig. 
  84), 
  which 
  is 
  

   remarkable 
  on 
  account 
  of 
  the 
  remoteness 
  of 
  the 
  tubercles 
  on 
  sub- 
  

   distant 
  longitudinal 
  costos. 
  All 
  of 
  these 
  forms 
  of 
  the 
  variety 
  varie- 
  

   gatum 
  have 
  a 
  more 
  or 
  less 
  lilac-tinted 
  aperture 
  ; 
  but 
  in 
  others 
  {vide 
  

   Conch. 
  Icon. 
  figs. 
  41 
  h, 
  c) 
  it 
  is 
  white, 
  and 
  the 
  style 
  of 
  colouring 
  reverts 
  

   more 
  to 
  the 
  typical 
  form 
  of 
  the 
  species. 
  The 
  form 
  which 
  has 
  been 
  

   named 
  C. 
  petrosum 
  (Wood, 
  Index 
  Test. 
  Suppl. 
  pi. 
  iv. 
  fig. 
  D 
  of 
  Sirom- 
  

   hus)and 
  its 
  varieties 
  (Sowerby, 
  Thes. 
  Conch, 
  figs. 
  171, 
  172 
  ; 
  Conch. 
  

   Icon. 
  figs. 
  43 
  a, 
  b) 
  difter 
  very 
  considerably 
  from 
  the 
  normal 
  0. 
  tuber- 
  

   culatum 
  ; 
  but 
  in 
  the 
  specimen 
  depicted 
  by 
  the 
  two 
  last 
  figures 
  we 
  

   find 
  the 
  connecting 
  link. 
  

  

  In 
  the 
  type 
  figured 
  by 
  Wood, 
  now 
  in 
  the 
  British 
  Museum, 
  the 
  

   tubercles 
  are 
  much 
  compressed 
  and 
  united 
  laterally 
  so 
  as 
  to 
  form 
  

   lirae 
  continuous 
  on 
  and 
  between 
  longitudinal 
  folds 
  ; 
  however, 
  upon 
  

   the 
  uppermost 
  volutions 
  the 
  granules 
  become 
  more 
  prominent. 
  

  

  The 
  colouring 
  of 
  this 
  shell 
  is 
  similar 
  to 
  that 
  of 
  the 
  variety 
  C. 
  

   pupa, 
  excepting 
  some 
  of 
  the 
  tubercles 
  and 
  lirte 
  being 
  black, 
  indi- 
  

   cating 
  a 
  return 
  to 
  the 
  black 
  nodulation 
  of 
  the 
  typical 
  C. 
  tuberculatian. 
  

  

  2. 
  C. 
  moms, 
  the 
  synonymy 
  of 
  which 
  is 
  given 
  above, 
  has 
  three 
  

   rows 
  of 
  granules 
  on 
  the 
  upper 
  whorls, 
  and 
  if 
  a 
  fourth 
  be 
  present 
  

   on 
  the 
  penultimate 
  whorl, 
  as 
  is 
  sometimes 
  the 
  case, 
  it 
  invariably 
  

   consists 
  of 
  much 
  smaller 
  tubercles 
  than 
  those 
  on 
  the 
  three 
  other 
  

   series. 
  The 
  last 
  varix 
  is 
  situated 
  on 
  the 
  side 
  of 
  the 
  body-whorl 
  

   exactly 
  opposite 
  the 
  labrum, 
  and 
  never 
  on 
  the 
  back 
  of 
  it, 
  as 
  in 
  C. 
  

   tuberculatum 
  3ii\d 
  its 
  yavieties. 
  The 
  p)rincip)al 
  rows 
  of 
  granules 
  on 
  

   this 
  whorl 
  are 
  six 
  in 
  number, 
  and 
  may 
  best 
  be 
  counted 
  upon 
  the 
  

   labrum, 
  where 
  the 
  sixth 
  or 
  lowermost 
  terminates 
  at 
  a 
  little 
  distance 
  

   from 
  the 
  canal, 
  those 
  actually 
  ending 
  at 
  the 
  canal 
  being 
  secondary 
  

   or 
  smaller 
  series 
  and 
  wind 
  round 
  the 
  short 
  basal 
  cauda 
  of 
  the 
  whorl. 
  

   The 
  labrum 
  also 
  becomes 
  more 
  thickened 
  in 
  adult 
  specimens 
  of 
  this 
  

   species 
  than 
  in 
  C. 
  tuberculatum. 
  The 
  specimens 
  collected 
  by 
  Dr. 
  

  

  