﻿MOLLTJSCA. 
  115 
  

  

  New 
  Caledonia 
  with, 
  the 
  type 
  from 
  Moreton 
  Bay, 
  and 
  am 
  convinced 
  

   that 
  they 
  constitute 
  but 
  a 
  single 
  species. 
  The 
  sculpture 
  is 
  the 
  same 
  

   in 
  both, 
  and 
  the 
  blood-red 
  stain 
  within 
  the 
  valves 
  of 
  a 
  crescent 
  form, 
  

   leaving 
  the 
  centre 
  and 
  margin 
  white, 
  is 
  present 
  in 
  adult 
  specimens 
  

   of 
  each, 
  bub 
  not 
  always 
  in 
  the 
  young. 
  The 
  only 
  distinction 
  appears 
  

   to 
  be 
  a 
  little 
  variation 
  of 
  colouring 
  on 
  the 
  upper 
  valve, 
  which 
  in 
  the 
  

   typical 
  form 
  is 
  white, 
  with 
  the 
  ridges 
  stained 
  and 
  blotched 
  with 
  

   " 
  fulvous 
  rust," 
  whilst 
  the 
  variety 
  has 
  the 
  costa3 
  more 
  uniformly 
  

   tinted 
  with. 
  " 
  red 
  " 
  or 
  pinkish 
  brown, 
  some 
  of 
  them 
  being 
  much 
  paler 
  

   than 
  others 
  ; 
  but 
  I 
  do 
  not 
  ever 
  find 
  them 
  alternately 
  white 
  and 
  red. 
  

   The 
  darker 
  ones 
  are 
  usually 
  in 
  pairs, 
  but 
  just 
  on 
  the 
  right 
  of 
  the 
  

   centre 
  three 
  dark 
  rays 
  come 
  together. 
  In 
  other 
  words, 
  the 
  shell 
  

   may 
  be 
  described 
  as 
  having 
  four 
  rays, 
  three 
  of 
  them 
  tinting 
  two 
  ad- 
  

   jacent 
  costae 
  each, 
  the 
  fourth 
  covering 
  three. 
  This 
  same 
  distribution 
  

   of 
  pale 
  and 
  darker 
  rays 
  holds 
  good 
  in 
  the 
  typical 
  form 
  and 
  is 
  faintly 
  

   indicated 
  in 
  Reeve's 
  figure 
  ; 
  and 
  in 
  the 
  handsomer 
  variety, 
  P. 
  solans, 
  

   the 
  same 
  peculiarity 
  is 
  met 
  with 
  and 
  is 
  well 
  portrayed 
  in 
  Philippi's 
  

   work. 
  This 
  charming 
  form 
  has 
  the 
  interior 
  similarly 
  stained 
  with 
  

   blood-red 
  as 
  in 
  the 
  two 
  other 
  varieties. 
  This 
  cannot, 
  I 
  consider, 
  be 
  

   the 
  species 
  described 
  by 
  Born 
  as 
  Ostrea 
  solans, 
  which 
  differs 
  greatly 
  

   in 
  form, 
  especially 
  with 
  regard 
  to 
  the 
  auricles. 
  The 
  only 
  shell 
  

   having 
  similar 
  small 
  ones, 
  as 
  far 
  as 
  I 
  can 
  discover, 
  is 
  P. 
  superlms, 
  

   Sowerby 
  ; 
  this 
  is 
  not, 
  however, 
  " 
  orange 
  "-coloured, 
  has 
  unequal 
  

   dorsal 
  slopes, 
  narrower 
  costa?, 
  and 
  deeper 
  grooves, 
  Bern's 
  figure, 
  

   however, 
  is 
  unreliable, 
  for 
  it 
  represents 
  a 
  shell 
  40 
  millim. 
  in 
  length 
  

   from 
  the 
  hinge-line 
  to 
  the 
  opposite 
  margin, 
  and 
  nearly 
  42 
  miUim. 
  

   across, 
  whilst 
  his 
  measurements, 
  given 
  in 
  the 
  text, 
  are 
  — 
  length 
  

   39 
  millim., 
  width 
  30| 
  millim. 
  

  

  72. 
  Pecten 
  singaporiims. 
  

  

  Soiverhy, 
  Thcs. 
  Conch, 
  vol. 
  i. 
  p. 
  74, 
  pi. 
  13. 
  fig. 
  55, 
  pi. 
  14. 
  fig. 
  71 
  ; 
  

  

  Reeve, 
  Conch. 
  Icon. 
  fig. 
  74. 
  

   Pecten 
  pica, 
  Reeve, 
  Conch. 
  Icon. 
  figs. 
  115 
  a, 
  h. 
  

   Pecten 
  cumingii, 
  Reeve, 
  I. 
  c. 
  figs. 
  140 
  a, 
  b. 
  

  

  Hah. 
  Singapore 
  (Soivh.) 
  ; 
  New 
  Zealand 
  {Reeve, 
  for 
  pica) 
  ; 
  Port 
  

   Curtis 
  {Coppinger) 
  ; 
  Moreton 
  Bay 
  {Reeve, 
  for 
  cumingii). 
  

  

  I 
  cannot 
  discover 
  any 
  distinction 
  between 
  P. 
  pica 
  and 
  this 
  species. 
  

   The 
  anterior 
  auricle 
  of 
  the 
  right 
  valve 
  is 
  destitute 
  of 
  colour, 
  and 
  the 
  

   serrated 
  margin 
  beneath 
  it 
  is 
  also 
  white. 
  P. 
  cumingii 
  is 
  a 
  fine 
  

   growth 
  of 
  the 
  same, 
  having 
  the 
  peculiarities 
  above 
  mentioned, 
  but 
  

   with 
  the 
  costoe 
  slightly 
  stouter. 
  

  

  73. 
  Pecten 
  dringi. 
  

   Reeve, 
  Conch. 
  Icon. 
  figs. 
  152 
  a, 
  b. 
  

  

  Hah. 
  Port 
  Molle, 
  Queensland, 
  14 
  fms. 
  {Coppinger) 
  ; 
  Bathursfc 
  

   Island, 
  N.W. 
  Australia 
  {Reeve) 
  ; 
  Cape 
  Capricorn, 
  E. 
  Australia 
  

   {Brit. 
  AIus.). 
  

  

  Purplish 
  and 
  brownish-purple 
  forms 
  of 
  this 
  species 
  appear 
  to 
  

  

  I 
  2 
  

  

  