﻿MOLLUSCA. 
  03 
  

  

  65. 
  Rissoina 
  curtisi. 
  (Plaie 
  Y. 
  fig. 
  M.) 
  

  

  Shell 
  elongate, 
  thick, 
  white, 
  very 
  coarsely 
  cancellated. 
  Number 
  

   ' 
  of 
  whorls 
  unknown, 
  the 
  apex 
  being 
  broken 
  off 
  ; 
  the 
  remaining 
  four 
  

   are 
  obliquely 
  sloping 
  at 
  the 
  upper 
  part, 
  and, 
  with 
  the 
  exception 
  of 
  

   the 
  last, 
  biangulated 
  at 
  the 
  sides, 
  the 
  angles 
  being 
  caused 
  by 
  the 
  

   prominence 
  of 
  two 
  spiral 
  liraj 
  upon 
  the 
  longitudinal 
  costse. 
  A 
  third 
  

   lira 
  is 
  seen 
  at 
  the 
  base 
  of 
  the 
  whorls 
  at 
  the 
  suture. 
  The 
  costoe 
  are 
  

   about 
  fourteen 
  on 
  a 
  whorl, 
  about 
  as 
  thick 
  as 
  the 
  transverse 
  ridges, 
  

   and 
  nodulous 
  at 
  the 
  points 
  of 
  intersection. 
  The 
  body-whorl 
  has 
  

   five 
  spiral 
  lir?e, 
  the 
  lowermost 
  being 
  separated 
  from 
  those 
  above 
  by 
  

   a 
  broad 
  smooth 
  furrow, 
  in 
  which 
  the 
  costas 
  are 
  almost 
  obsolete. 
  

   Aperture 
  obliquely 
  subovate, 
  rather 
  widely 
  channelled 
  in 
  front. 
  

   Columella 
  oblique, 
  covered 
  with 
  a 
  thin 
  callosity, 
  which 
  at 
  the 
  base 
  

   forms 
  the 
  sinistral 
  side 
  of 
  the 
  canal. 
  Labrum 
  much 
  thickened 
  ex- 
  

   teriorly, 
  acute 
  at 
  the 
  margin, 
  and 
  (viewed 
  laterally) 
  is 
  produced 
  to 
  

   the 
  left 
  at 
  the 
  front 
  part. 
  

  

  Probable 
  length 
  about 
  7 
  millira. 
  ; 
  actual 
  length 
  of 
  remaining 
  four 
  

   whorls 
  5| 
  millim., 
  width 
  2g. 
  

  

  Hah. 
  Port 
  Curtis, 
  7 
  fms. 
  

  

  This 
  species 
  might 
  be 
  considered 
  a 
  dwarfed, 
  strongly 
  cancellated 
  

   form 
  of 
  11. 
  clathrata 
  ; 
  it 
  is 
  less 
  slender, 
  has 
  fewer 
  and 
  stouter 
  costse, 
  

   and 
  the 
  spiral 
  lirte 
  are 
  also 
  thicker 
  and 
  two 
  in 
  number 
  upon 
  the 
  

   upper 
  whorls 
  exclusive 
  of 
  those 
  at 
  the 
  suture, 
  whilst 
  in 
  the 
  species 
  

   referred 
  to 
  there 
  are 
  three. 
  The 
  outer 
  lip 
  is 
  much 
  thickened 
  and 
  

   the 
  aperture 
  rather 
  more 
  contracted. 
  

  

  66. 
  Cerithium 
  morus. 
  

  

  Lamarck, 
  Am'ni. 
  suits 
  Vert, 
  ed, 
  2, 
  vol. 
  ix. 
  p. 
  302 
  ; 
  Kiciier, 
  Coq. 
  Viv. 
  

  

  p. 
  52, 
  pi. 
  15. 
  fig. 
  1 
  ; 
  Soiverby, 
  Thes. 
  Conch, 
  figs. 
  159-161 
  ; 
  id. 
  Conch. 
  

  

  Icon. 
  tig. 
  42. 
  

   Var. 
  ^ 
  Cerithium 
  moniliferum, 
  Dvfresne, 
  Kiener, 
  Coq. 
  Viv. 
  p. 
  49, 
  

  

  pi. 
  16. 
  fig. 
  3; 
  Sowerhy, 
  Thes. 
  figs. 
  163, 
  165 
  ; 
  id. 
  Conch. 
  Ic. 
  fig. 
  20. 
  

   Var. 
  = 
  Cerithium 
  carbonarium, 
  Sowerhy 
  (non 
  Philippi), 
  Conch. 
  Icon. 
  

  

  fig. 
  59. 
  

  

  Uab. 
  Philippine 
  Islands 
  (Cttminr/) 
  ; 
  Samoa 
  Islands 
  (Hev. 
  S. 
  J. 
  

   Whitmee 
  in 
  Brit. 
  Mus.) 
  ; 
  Port 
  Jackson, 
  7 
  fms. 
  ; 
  Friday 
  Island, 
  

   Roko 
  Island, 
  Endeavour 
  Strait, 
  and 
  West 
  Island, 
  Prince 
  of 
  Wales 
  

   Channel, 
  Torres 
  Straits 
  (Coj>2ringer) 
  ; 
  Dungeness 
  Island, 
  Torres 
  

   Straits 
  (Brazier) 
  ; 
  Hall 
  Sound, 
  New 
  Guinea 
  {Brazier). 
  

  

  The 
  small 
  group 
  of 
  species 
  to 
  which 
  C. 
  moms 
  belongs, 
  including 
  

   C. 
  tuherculatum 
  of 
  Linnaeus 
  as 
  defined 
  by 
  Hanley 
  (' 
  Ipsa 
  Linna^i 
  

   Conchylia,' 
  p. 
  276, 
  pi. 
  iv, 
  fig. 
  4), 
  C 
  lemniscatum, 
  C. 
  breve, 
  and 
  C. 
  

   variegatam, 
  Quoy 
  and 
  Gaimard, 
  O. 
  petrosum 
  and 
  0. 
  riigosum 
  of 
  

   Wood 
  (non 
  Lamarck) 
  =G.patiens, 
  Bayle, 
  C. 
  moniliferurii,~K\ei\cr, 
  G. 
  

   gemma, 
  C. 
  purpurascens, 
  C. 
  bifasciatum, 
  C. 
  pupa, 
  and 
  C. 
  nigro- 
  

   fasciatum 
  of 
  Sowerby, 
  is 
  very 
  perplexing, 
  owing 
  to 
  the 
  great 
  simi- 
  

   larity 
  in 
  sculpture 
  of 
  the 
  various 
  species. 
  

  

  1. 
  C. 
  tuherculatum, 
  to 
  which 
  I 
  unite 
  as 
  varieties 
  C. 
  variegatam, 
  

  

  