﻿62 
  - 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  species, 
  not 
  mentioned 
  by 
  the 
  above 
  authors 
  : 
  — 
  R. 
  Jimbriata, 
  

   JR. 
  flavescens, 
  R. 
  grisea, 
  and 
  R. 
  plicatula. 
  Another 
  species 
  which 
  

   has 
  also 
  escaped 
  attention 
  is 
  the 
  Trochus 
  melanostoma 
  of 
  Reeve 
  

   (Proc. 
  Zool. 
  Soc. 
  1842, 
  p. 
  185 
  ; 
  Conch. 
  Sjst. 
  vol. 
  ii. 
  pi. 
  218. 
  fig. 
  IG). 
  

   This 
  is 
  the 
  same 
  as 
  RiseJla 
  fimbriata 
  of 
  Philippi, 
  which 
  I 
  think 
  

   should 
  be 
  regarded 
  as 
  a 
  large 
  form 
  of 
  R. 
  melanostoma, 
  Gmelin 
  ; 
  and 
  

   with 
  this 
  species 
  I 
  would 
  also 
  unite 
  R. 
  fiavescens 
  and 
  R. 
  pUcatida 
  of 
  

   Philippi. 
  Dunker 
  has 
  also 
  described 
  a 
  species 
  from 
  Sydney 
  under 
  

   the 
  name 
  of 
  R. 
  crassa, 
  which 
  appears 
  to 
  be 
  remarkable 
  on 
  account 
  

   of 
  a 
  thickened 
  channelled 
  lip 
  (Mai. 
  Bliit. 
  1861, 
  vol. 
  viii. 
  p. 
  42). 
  

  

  R. 
  Jcielmannseggl, 
  Zelebor, 
  is 
  the 
  R. 
  lutea, 
  Quoy, 
  of 
  which 
  R. 
  

   imbricata 
  may 
  be 
  a 
  variety. 
  The 
  two 
  following 
  species 
  resemble 
  

   Risella 
  in 
  form, 
  but 
  have 
  the 
  concentric 
  multispiral 
  operculum 
  

   of 
  Ti'ocJms, 
  from 
  which 
  they 
  are 
  distinguished 
  by 
  their 
  non-pearly 
  

   apertures 
  — 
  Trochus 
  tantillus, 
  Gould, 
  and 
  Risclla 
  isseli, 
  Semper. 
  

   The 
  Tectarhis 
  luteus 
  of 
  Gould, 
  Risella 
  infracostata, 
  Issel, 
  R. 
  par- 
  

   vula, 
  Dunker 
  (? 
  = 
  tantillus), 
  and 
  Trochus 
  conoidaUs 
  of 
  Pease 
  will 
  

   probably 
  have 
  similar 
  opercula 
  ; 
  these 
  four 
  species 
  differ 
  from 
  

   Risella 
  not 
  only 
  in 
  the 
  operculum, 
  but 
  in 
  being 
  narrowly 
  per- 
  

   forated. 
  The 
  statement 
  with 
  regard 
  to 
  Risella 
  aurata 
  being 
  the 
  

   male 
  of 
  R. 
  nana 
  (although 
  both 
  are 
  hermaphrodite) 
  made 
  by 
  

   Mr. 
  Tenison- 
  Woods 
  (Proc. 
  Linn, 
  Soc. 
  N. 
  S. 
  Wales, 
  vol. 
  i. 
  p. 
  244), 
  

   and 
  that 
  " 
  cdl 
  breed 
  freely 
  with 
  one 
  another," 
  seems 
  to 
  me 
  to 
  re- 
  

   quire 
  some 
  further 
  corroboration. 
  He 
  himself 
  hesitates 
  to 
  assert 
  

   positively 
  that 
  either 
  of 
  these 
  two 
  forms 
  are 
  incapable 
  of 
  repro- 
  

   ducing 
  their 
  own 
  kind, 
  " 
  for 
  there 
  are 
  many 
  places 
  on 
  the 
  coast 
  

   where 
  no 
  species 
  can 
  be 
  found 
  except 
  the 
  variety 
  now 
  known 
  as 
  

   R. 
  aurata." 
  This, 
  in 
  my 
  judgment, 
  proves 
  that 
  that 
  species 
  at 
  all 
  

   events 
  is 
  self-propagating 
  ; 
  yet 
  Mr. 
  Tenison- 
  Woods 
  says 
  that 
  

   specimens 
  of 
  this 
  species 
  kept 
  in 
  glass 
  jars 
  for 
  a 
  few 
  weeks 
  did 
  not 
  

   become 
  fertile. 
  Experiments 
  miide 
  for 
  so 
  short 
  a 
  time 
  are 
  far 
  from 
  

   conclusive, 
  especially 
  when 
  made 
  under 
  such 
  artificial 
  conditions. 
  

  

  64. 
  Eissoina 
  clathrata. 
  

  

  A. 
  Adams, 
  Proc. 
  Zool. 
  Soc. 
  18-51, 
  p. 
  265; 
  Schwartz 
  von 
  Muhrenstern, 
  

   Denkschrift. 
  Akad. 
  Wissenschaft. 
  Wien, 
  1861, 
  vol. 
  xix. 
  pt. 
  2, 
  p. 
  154, 
  

   pi. 
  vi. 
  tig. 
  49 
  ; 
  S^nith, 
  Journ. 
  Linn. 
  Soc. 
  vol. 
  xii. 
  p. 
  553. 
  

  

  Hab. 
  Prince 
  of 
  Wales 
  Channel, 
  7 
  fms. 
  {Coppinger) 
  ; 
  Philippine 
  

   Islands 
  {^Cuming) 
  ; 
  var. 
  minor, 
  from 
  the 
  Caroline 
  Islands 
  (J. 
  

   Brazier) 
  . 
  

  

  The 
  specimen 
  obtained 
  by 
  Dr. 
  Coppinger 
  is 
  of 
  a 
  yellow-wax 
  

   colour, 
  faintly 
  tinged 
  with 
  rose 
  towards 
  the 
  apex 
  and 
  at 
  the 
  aper- 
  

   ture. 
  It 
  has 
  the 
  upper 
  whorls 
  broken 
  off, 
  the 
  remaining 
  four 
  and 
  

   a 
  half 
  measuring 
  10 
  miUim. 
  in 
  length. 
  The 
  figures 
  in 
  KUster'a 
  

   ' 
  Conchylieu-Cabinet,' 
  pi. 
  iv. 
  figs. 
  12, 
  13, 
  do 
  not 
  give 
  the 
  faintest 
  

   idea 
  of 
  this 
  species, 
  and 
  probably 
  represent 
  another. 
  

  

  