﻿72 
  COLLECTIONS 
  FROM 
  MELANESIA, 
  

  

  characteristic 
  of 
  T. 
  speciosus. 
  ZizipMnus 
  comptas, 
  A. 
  Adorns, 
  is 
  a 
  

   different 
  species 
  from 
  that 
  described 
  hy 
  I'hilippi, 
  and 
  has 
  since 
  been 
  

   described 
  by 
  Souverbic 
  under 
  the 
  name 
  of 
  T. 
  poiqnneli. 
  

  

  90. 
  Trochus 
  (Calliostoma) 
  decoratiis. 
  

  

  Trochus 
  decoratus, 
  Philij^jn, 
  Con.- 
  Cab. 
  pi. 
  13. 
  fig. 
  1. 
  

   Zizyphinus 
  decoratus, 
  lieeve, 
  Conch. 
  Icon. 
  fig. 
  28 
  ; 
  A. 
  Adams, 
  Proc. 
  

   Zool. 
  Sac. 
  1851, 
  p. 
  1G5. 
  

  

  Hah. 
  " 
  ? 
  " 
  {Pliilippi) 
  ; 
  Brisbane 
  waters, 
  East 
  Australia 
  ( 
  i?r 
  eve) 
  ; 
  

  

  Sj'duey 
  and 
  Port 
  Jackson 
  {Coppinger 
  and 
  Lieut. 
  A. 
  Smith, 
  li.N.). 
  

  

  The 
  interior 
  of 
  the 
  aperture 
  of 
  this 
  species, 
  close 
  to 
  the 
  outer 
  and 
  

   basal 
  margin, 
  is 
  thickened 
  ^^ith 
  a 
  whitish 
  and 
  more 
  or 
  loss 
  cloudy 
  

   pearly 
  deposit, 
  which 
  conceals 
  to 
  some 
  extent 
  the 
  beautiful 
  iri- 
  

   descence 
  observable 
  further 
  within. 
  

  

  91. 
  Trochus 
  (Calliostoma) 
  rubropunctatus. 
  

  

  Ziziphinus 
  rubropuuctatus, 
  A. 
  Adams, 
  Proc. 
  Zool. 
  Soc. 
  1851, 
  p. 
  1(37 
  ; 
  

   Reeve, 
  Condi. 
  Icon. 
  fig. 
  56. 
  

  

  Hah. 
  ? 
  {Adams 
  t|' 
  Reeve); 
  Albany 
  Island, 
  F. 
  Australia, 
  in 
  

  

  3-4 
  fms. 
  on 
  a 
  muddy 
  bottom, 
  and 
  Port 
  Darwin, 
  ^.W. 
  Australia, 
  

   8-12 
  fms. 
  {Coppingtr). 
  

  

  This 
  is 
  a 
  most 
  charming 
  little 
  species, 
  and 
  readilj' 
  recognized 
  by 
  

   its 
  peculiar 
  painting 
  and 
  remarkable 
  sculpture. 
  Adams 
  describes 
  

   the 
  colour 
  as 
  " 
  lutescens." 
  I 
  should 
  rather 
  consider 
  it 
  pale 
  fleshy 
  

   pink, 
  with 
  dark 
  red 
  dots 
  in 
  the 
  interstices 
  between 
  the 
  oblique 
  

   costre 
  and 
  the 
  transverse 
  or 
  spiral 
  ridges. 
  The 
  latter 
  are 
  said 
  to 
  be 
  

   four 
  in 
  number 
  on 
  the 
  last 
  whorl 
  ; 
  but 
  on 
  careful 
  examination 
  I 
  find 
  

   six, 
  of 
  which 
  four 
  are, 
  however, 
  more 
  prominent 
  than 
  the 
  rest. 
  

   The 
  tipper 
  volutions 
  are 
  encircled 
  by 
  three 
  principal 
  liroe, 
  and 
  a 
  

   fourth 
  secondary 
  one 
  at 
  the 
  suture. 
  The 
  points 
  of 
  intersection 
  of 
  

   these 
  spiral 
  ridges 
  and 
  the 
  oblique 
  costse 
  are 
  produced 
  into 
  quite 
  

   acute 
  nodules 
  or 
  prickles. 
  The 
  base 
  of 
  the 
  shell 
  is 
  almost 
  flat, 
  

   ornamented 
  with 
  about 
  six 
  concentric 
  liroe, 
  which 
  are 
  more 
  or 
  less 
  

   granulous, 
  with 
  the 
  interstices 
  exhibiting 
  strong 
  lines 
  of 
  growth 
  

   and 
  translucent 
  nacre. 
  The 
  colour 
  closely 
  approaches 
  the 
  rest 
  of 
  

   the 
  surface, 
  varied 
  with 
  brown 
  dots 
  both 
  upon 
  and 
  between 
  the 
  

   granules. 
  

  

  92. 
  Trochus 
  (Thalotia) 
  torresi. 
  (Plate 
  VI. 
  fig. 
  A.) 
  

  

  Shell 
  sharply 
  conical, 
  subperforated 
  or 
  with 
  the 
  perforation 
  con- 
  

   cealed, 
  greenish 
  (sometimes 
  pinkish 
  red), 
  with 
  oblique 
  white 
  narrow 
  

   stripes 
  and 
  darker 
  green 
  (or 
  rosy 
  black) 
  spotting 
  at 
  the 
  base 
  of 
  the 
  

   whorls 
  and 
  iipon 
  the 
  angle 
  of 
  the 
  last. 
  Volutions 
  about 
  8, 
  flat, 
  

   margined 
  at 
  the 
  lower 
  part 
  with 
  two 
  rows 
  of 
  closely 
  packed 
  granules 
  

   rather 
  more 
  prominent 
  than 
  five 
  others 
  above. 
  Between 
  these, 
  in 
  

   well-preserved 
  specimens, 
  very 
  fine 
  lira? 
  (one 
  in 
  each 
  interstice) 
  and 
  

   oblique 
  lines 
  of 
  growth 
  are 
  discernible. 
  Last 
  whorl 
  rather 
  acutely 
  

   angled 
  at 
  the 
  periphery, 
  beneath 
  with 
  about 
  nine 
  concentric 
  rows 
  of 
  

  

  