﻿MOLLUSC 
  A. 
  51 
  

  

  and 
  appears 
  to 
  correspond 
  with 
  Kiener's 
  idea 
  of 
  the 
  Lamarckian 
  

   shell 
  (Coq. 
  Viv. 
  fol. 
  34, 
  f. 
  81) 
  and 
  also 
  with 
  the 
  specimen 
  figured 
  by 
  

   Kiister 
  (Con.-Cab. 
  pi. 
  23. 
  f. 
  5). 
  But 
  whether 
  all 
  or 
  none 
  of 
  these 
  

   figures 
  delineate 
  the 
  true 
  P. 
  undata 
  appears 
  to 
  me 
  questionable. 
  

   However, 
  I 
  do 
  not 
  believe 
  that 
  the 
  West-Indian 
  shell 
  which 
  has 
  

   been 
  assigned 
  to 
  it 
  by 
  d'Orbigny 
  (Eamon 
  de 
  la 
  Sagra's 
  Hist. 
  Cuba, 
  

   vol. 
  ii. 
  p. 
  145) 
  and 
  those 
  figured 
  by 
  Tryon 
  (Man. 
  Couch, 
  f. 
  82, 
  100 
  

   103, 
  and 
  109) 
  can 
  beyond 
  a 
  doubt 
  be 
  considered 
  Lamarck's 
  sj)ecies. 
  

   The 
  dimensions 
  he 
  gives, 
  namely 
  22 
  lines 
  in 
  length, 
  exceed 
  those 
  

   of 
  the 
  West-Indian 
  examples; 
  nor 
  does 
  the 
  description 
  of 
  the 
  colour, 
  

   " 
  albo 
  et 
  fusco-nigricante 
  longitudinaliter 
  undatimque 
  picta,'' 
  apply 
  

   well 
  to 
  those 
  shells, 
  but 
  admirably 
  suits 
  the 
  specimens 
  figured 
  by 
  

   Kiister, 
  Reeve, 
  and 
  Kiener. 
  The 
  locality, 
  " 
  Monte 
  Christi, 
  West 
  

   Columbia,'' 
  given 
  by 
  Reeve 
  for 
  his 
  shell 
  is 
  no 
  doubt 
  erroneous, 
  and 
  

   applies 
  to 
  two 
  others 
  on 
  the 
  same 
  tablet, 
  considered 
  by 
  Cuming 
  the 
  

   same 
  species, 
  but 
  which 
  on 
  careful 
  examination 
  prove 
  to 
  be 
  without 
  

   doubt 
  examples 
  of 
  P. 
  biserialis, 
  Elainville 
  { 
  = 
  P. 
  bicostalis. 
  Reeve, 
  

   ? 
  of 
  Lamarck). 
  This 
  species 
  has 
  a 
  character 
  not 
  found 
  in 
  P. 
  hitu- 
  

   hercularis 
  and 
  its 
  varieties, 
  namely 
  the 
  oblique 
  plications 
  on 
  the 
  

   lower 
  part 
  of 
  the 
  columella 
  ; 
  and 
  P. 
  fasciata 
  of 
  Reeve, 
  which 
  is 
  also 
  

   conspecific 
  with 
  P. 
  undata^ 
  d'Orb. 
  (non 
  Lamk.), 
  and 
  P. 
  forbesii, 
  

   Dunker, 
  also 
  has 
  on 
  the 
  columella 
  a 
  distinguishing 
  character 
  which 
  

   has 
  not 
  been 
  noticed, 
  viz. 
  a 
  small 
  brown 
  stain, 
  most 
  observable 
  in 
  

   fresh 
  specimens, 
  at 
  the 
  inferior 
  end, 
  and 
  an 
  oblique 
  mark 
  of 
  the 
  

   same 
  colour 
  in 
  a 
  line 
  with 
  the 
  raised 
  ridge 
  at 
  the 
  base 
  of 
  the 
  body- 
  

   whorl. 
  

  

  85. 
  Purpura 
  (Cronia) 
  amygdala. 
  

  

  Purpura 
  amygdala, 
  Kiener, 
  Coq. 
  Viv. 
  p. 
  39, 
  pi. 
  10. 
  fig. 
  26 
  ; 
  Chenu, 
  

  

  Man. 
  de 
  Conch, 
  fig. 
  807. 
  

   Buccinum 
  amygdala, 
  Reeve, 
  Conch. 
  Icon. 
  fig. 
  60. 
  

  

  Hah. 
  Port 
  Denison, 
  4 
  fms. 
  {Coppinger) 
  ; 
  Home 
  Islands, 
  off 
  Cape 
  

   Grenville, 
  N.E. 
  Australia, 
  also 
  Moretou 
  Bay, 
  Port 
  Jackson, 
  and 
  

   Port 
  Darwin 
  (Brazier). 
  

  

  The 
  operculum 
  of 
  this 
  species 
  is 
  normally 
  Purpuroid, 
  although 
  

   the 
  basal 
  channel 
  of 
  the 
  aperture 
  is 
  unusually 
  narrower 
  than 
  in 
  the 
  

   genus. 
  

  

  36. 
  Sistrum 
  undatum, 
  var. 
  

   Ricinula 
  fiscellum, 
  Reeve 
  (non 
  Chenmitz), 
  Conch. 
  Icon. 
  pi. 
  4. 
  fig. 
  28. 
  

  

  Hah. 
  Port 
  Darwin 
  {Coppinger) 
  ; 
  Port 
  Essington 
  (Jiil-es 
  in 
  Brit. 
  

   Mus.). 
  

  

  This 
  variety 
  is 
  ulso 
  (juoted 
  from 
  the 
  north 
  coast 
  of 
  Australia 
  by 
  

   G. 
  and 
  H. 
  Xevill 
  (Journ. 
  Asiatic 
  Soc. 
  Bengal, 
  1875, 
  vol. 
  xliv, 
  pt. 
  2, 
  

   p. 
  83). 
  It 
  differs 
  from 
  the 
  typical 
  form 
  of 
  this 
  well-known 
  s])ecies 
  

   in 
  its 
  greater 
  bi'eadth, 
  in 
  having 
  fewer 
  and 
  larger 
  nodose 
  plications, 
  

   and 
  in 
  the 
  fineness 
  and 
  closeness 
  of 
  the 
  transverse 
  squamose 
  

   ridges. 
  

  

  E 
  2 
  

  

  