﻿MOLLUSC 
  A. 
  73 
  

  

  granules 
  alternating 
  with 
  others 
  very 
  much 
  finer, 
  having 
  smaller 
  

   and 
  subobsolete 
  tubercles. 
  The 
  aperture 
  is 
  obliquely 
  subqnadrate. 
  

   Columella 
  a 
  little 
  arcuate 
  at 
  the 
  upper 
  part, 
  white, 
  retloxcd 
  over 
  

   the 
  white 
  umbilical 
  region 
  and 
  subtrnncate 
  anteriorly. 
  Height 
  

   12 
  millim., 
  diam. 
  Dg 
  ; 
  another 
  specimen 
  is 
  13 
  high, 
  and 
  12 
  in 
  

   ■width. 
  

  

  Hah. 
  Prince 
  of 
  Wales 
  Channel, 
  Torres 
  Straits. 
  

  

  There 
  are 
  two 
  varieties 
  of 
  this 
  pretty 
  species, 
  which 
  may 
  be 
  

   termed 
  the 
  green 
  and 
  pink. 
  The 
  foimer 
  is 
  represented 
  by 
  four 
  

   specimens 
  in 
  the 
  Museum 
  (three 
  belonging 
  to 
  the 
  Cumingian 
  col- 
  

   lection) 
  and 
  the 
  latter 
  by 
  two, 
  which 
  fact, 
  however, 
  can 
  hardly 
  bo 
  

   accepted 
  as 
  indicating 
  the 
  relative 
  abundance 
  of 
  the 
  two 
  forms. 
  

  

  In 
  the 
  green 
  variety 
  the 
  base 
  in 
  three 
  out 
  of 
  the 
  four 
  examples 
  is 
  

   somewhat 
  pinkish, 
  radiatcly 
  streaked 
  with 
  white, 
  whilst 
  in 
  the 
  

   fourth 
  specimen 
  it 
  is 
  green 
  with 
  irregular 
  strcalss 
  and 
  has 
  a 
  more 
  

   tessellated 
  aspect. 
  The 
  perforation 
  is 
  small, 
  and 
  may 
  either 
  be 
  con- 
  

   cealed 
  by 
  a 
  thin 
  callosity 
  or 
  remain 
  open. 
  

  

  This 
  is 
  a 
  smaller 
  species 
  than 
  T. 
  fra[/u7n 
  (Phil.), 
  has 
  more 
  nume- 
  

   rous 
  granules 
  (of 
  which 
  there 
  are. 
  Jive 
  instead 
  of 
  four 
  rows, 
  besides 
  

   the 
  basal 
  girdle), 
  and 
  intervening 
  fine 
  lira; 
  are 
  generally 
  to 
  be 
  met 
  

   with 
  on 
  the 
  spire, 
  which 
  are 
  wanting 
  in 
  Philippi's 
  shell. 
  I 
  should 
  

   also 
  observe 
  that 
  the 
  columella 
  of 
  T. 
  fragum, 
  judging 
  from 
  the 
  

   figure, 
  is 
  less 
  incurved 
  than 
  in 
  this 
  form. 
  

  

  93. 
  Trochus 
  (Monilea) 
  lifuana. 
  (Plate 
  VI. 
  figs. 
  B, 
  B 
  1.) 
  

  

  Fischer, 
  Journ. 
  de 
  Con. 
  1878, 
  vol. 
  xxvi. 
  p. 
  G3. 
  

   ]\Iouilea 
  lifuana, 
  Fischer, 
  I. 
  c. 
  1879, 
  vol. 
  xxvii. 
  p. 
  30, 
  pi. 
  3. 
  fig. 
  5. 
  

   Trochus 
  lifuauus, 
  Fischer 
  in 
  Kiener^s 
  Coq. 
  Viv. 
  p. 
  3S8, 
  pi. 
  IIG. 
  

   fig. 
  4. 
  

  

  Shell 
  suborbicular, 
  only 
  slightly 
  elevated, 
  moderately 
  thick, 
  nar- 
  

   rowly 
  umbilicated, 
  spirally 
  lirate 
  and 
  striated 
  throughout, 
  and 
  

   marked 
  with 
  rather 
  distinct 
  lines 
  of 
  growth, 
  pinkish 
  white, 
  varied 
  

   with 
  large 
  brownish 
  blotches 
  and 
  transverse 
  lines 
  articulated 
  with 
  

   white 
  and 
  dark 
  purplish 
  brown. 
  Whorls 
  5^-6, 
  convex, 
  separated 
  

   bj' 
  a 
  deepish 
  suture. 
  Last 
  whorl 
  compressed, 
  convex 
  and 
  concen- 
  

   trically 
  striated 
  beneath, 
  obtusely 
  subangled 
  at 
  the 
  periphery. 
  Spire 
  

   not 
  much 
  elevated, 
  having 
  slightly 
  convex 
  outlines. 
  Umbilicus 
  

   narrow, 
  perforate 
  to 
  the 
  apex, 
  margined 
  with 
  a 
  thickened 
  spiral 
  

   white 
  or 
  spotted 
  callus 
  and 
  furnished 
  with 
  a 
  second 
  more 
  elevated 
  

   one 
  within, 
  which 
  termimites 
  on 
  the 
  columella 
  in 
  a 
  lateral 
  j'ellowish 
  

   projection. 
  Aperture 
  quadrat 
  ely 
  subcircular, 
  oblique, 
  only 
  thinly 
  

   nacreous 
  within. 
  Columella 
  oblique, 
  arcuate, 
  thickened 
  by 
  the 
  ends 
  

   of 
  the 
  two 
  spiral 
  callosities 
  of 
  the 
  umbilicus 
  and 
  slightly 
  reflcxed. 
  

   Outer 
  lip 
  (viewed 
  laterally) 
  obliquely 
  excurved 
  above 
  the 
  periphery 
  

   and 
  broadly 
  siniiated 
  beneath. 
  Height 
  6| 
  millim. 
  ; 
  greatest 
  dia- 
  

   meter 
  9, 
  smallest 
  7|. 
  

  

  Hctb. 
  Prince 
  of 
  Wales 
  Channel, 
  Torres 
  Straits, 
  7 
  fms. 
  

  

  The 
  colouring 
  in 
  the 
  two 
  specimens 
  from 
  this 
  locality 
  is 
  very 
  

   similar, 
  differing 
  only 
  in 
  the 
  amount 
  and 
  size 
  of 
  the 
  blotches, 
  which 
  

  

  