﻿IKEDALE 
  : 
  ON- 
  THE 
  * 
  SIKVSIGEIIA 
  APEX 
  '. 
  75 
  

  

  Sinusigera 
  type." 
  To 
  know 
  whether 
  a 
  shell 
  possesses 
  a 
  Siniisigera 
  

   apex 
  very 
  young 
  shells 
  must 
  be 
  collected 
  either 
  alive 
  or 
  dead. 
  Many 
  

   shells 
  possess 
  such 
  apices, 
  but 
  in 
  adult 
  specimens 
  the 
  characters 
  are 
  so 
  

   obscure 
  that 
  it 
  cannot 
  be 
  recognized. 
  Moreover, 
  it 
  is 
  very 
  often 
  

   tilted, 
  and 
  the 
  latter 
  whorls 
  make 
  the 
  claw 
  unrecognizable. 
  A 
  shell 
  

   with 
  a 
  Sinusigera 
  apex 
  will 
  be 
  of 
  widespread 
  distribution, 
  and, 
  vice 
  

   versa, 
  many 
  shells, 
  widely 
  distributed, 
  will 
  be 
  found 
  to 
  owe 
  their 
  

   range 
  to 
  their 
  Smusigera 
  jouih. 
  

  

  The 
  most 
  common 
  Purpuroid 
  on 
  Sunday 
  Island 
  was 
  a 
  beautiful 
  

   little 
  shell 
  described 
  by 
  Suter 
  as 
  a 
  sub-species 
  of 
  Purpura 
  striata 
  under 
  

   the 
  title 
  BoUonsi 
  (Trans. 
  K 
  Zeal. 
  Inst., 
  1905 
  (1906), 
  vol. 
  xxxviii, 
  

   p. 
  331). 
  Later 
  he 
  extended 
  its 
  range 
  to 
  New 
  Zealand, 
  but 
  transferred 
  

   it 
  to 
  Drupa, 
  giving 
  it 
  specific 
  rank 
  (Proc. 
  Malac. 
  Soc, 
  1909, 
  vol. 
  viii, 
  

   p. 
  254, 
  pi. 
  xi, 
  figs. 
  5-7). 
  He 
  states 
  in 
  his 
  description, 
  "protoconch 
  

   minute." 
  Many 
  shells 
  were 
  collected 
  by 
  me, 
  young 
  shells 
  with 
  

   the 
  protoconch, 
  as 
  well 
  as 
  old 
  ones 
  showing 
  variation 
  of 
  shape 
  and 
  

   form. 
  Living 
  on 
  the 
  wave-swept 
  boulders 
  they 
  were 
  very 
  stumpy, 
  

   the 
  spire 
  scarcely 
  raised, 
  and 
  the 
  mouth 
  very 
  heavily 
  armoured. 
  

   Constantly 
  being 
  knocked 
  off 
  and 
  smashed, 
  they 
  all 
  showed 
  repairs, 
  

   and 
  it 
  was 
  noted 
  that 
  the 
  new 
  shell 
  never 
  had 
  nodulous 
  sculpture, 
  

   the 
  characteristic 
  of 
  the 
  adult. 
  Shells 
  living 
  in 
  sheltered 
  places 
  hud 
  

   fine 
  spires, 
  being 
  long 
  and 
  narrow, 
  and 
  the 
  aperture 
  not 
  very 
  strongly 
  

   toothed. 
  This 
  series 
  made 
  the 
  shell 
  easily 
  recognizable 
  as 
  that 
  figured 
  

   by 
  Brazier 
  from 
  Lord 
  Howe 
  Island 
  (Mem. 
  Aust. 
  Mus., 
  1889, 
  vol. 
  ii, 
  

   p. 
  28, 
  pi. 
  iv, 
  figs. 
  1-4, 
  7-12, 
  21, 
  22). 
  The 
  twelve 
  figures 
  there 
  given 
  

   are 
  very 
  good, 
  though 
  reversed. 
  No 
  description 
  was 
  offered. 
  Brazier 
  

   called 
  it 
  Purpura 
  Smithi. 
  Kesteveu, 
  in 
  the 
  paper 
  first 
  quoted, 
  gave 
  

   a 
  description 
  of 
  this 
  shell, 
  but 
  placed 
  it 
  as 
  a 
  variety 
  of 
  Purpura 
  

   tritoniformis, 
  Blain., 
  with 
  which, 
  in 
  my 
  opinion, 
  it 
  has 
  less 
  affinity 
  

   than 
  with 
  Purpura 
  striata, 
  Martyn, 
  with 
  which 
  Suter 
  first 
  associated 
  

   it. 
  The 
  shell 
  is 
  certainly 
  a 
  valid 
  species, 
  and 
  is 
  close 
  to 
  the 
  latter 
  

   species. 
  I 
  do 
  not 
  consider 
  it 
  a 
  Drupa. 
  The 
  apical 
  characters 
  are 
  : 
  

   Five-whorled, 
  Sinusigera 
  in 
  form, 
  red-brown 
  in 
  colour, 
  paler 
  towards 
  

   the 
  apex, 
  the 
  last 
  two 
  whorls 
  keeled 
  at 
  the 
  periphery, 
  with 
  faint 
  

   wrinkle 
  sculpture 
  longitudinally, 
  only 
  showing 
  in 
  fresh 
  specimens. 
  

   It 
  is 
  usually 
  tilted. 
  

  

  Hedley 
  has 
  described 
  the 
  apex 
  of 
  Purpura 
  pseudamygdala 
  "of 
  the 
  

   Sinusigera 
  type, 
  broad, 
  with 
  rounded 
  whorls, 
  brown, 
  smooth, 
  and 
  

   glossy" 
  (Proc. 
  Linn. 
  Soc. 
  KS.W., 
  1903, 
  vol. 
  xxvii, 
  p. 
  599). 
  When 
  

   Kesteveu 
  treated 
  of 
  the 
  apices 
  of 
  tritoniformis, 
  Blain., 
  and 
  succinda. 
  

   Lam., 
  he 
  noted 
  that 
  Pu,rpura 
  neglecta^a^ 
  generically 
  separable. 
  Later 
  

   he 
  described 
  its 
  apex, 
  showing 
  it 
  to 
  consist 
  of 
  one 
  and 
  a 
  half 
  whorls 
  

   indistinctly 
  marked 
  off 
  (Proc. 
  Linn. 
  Soc. 
  N.S.W., 
  1901, 
  vol. 
  xxvi, 
  

   p. 
  714, 
  pi. 
  xxxvi, 
  fig. 
  2), 
  and 
  included 
  it 
  in 
  Sistrum. 
  There 
  was 
  

   no 
  doubt 
  this 
  was 
  unsatisfactory, 
  so 
  Hedley 
  (Proc. 
  Linn. 
  Soc. 
  KS.W., 
  

   1908, 
  vol. 
  xxxiii, 
  p. 
  456) 
  suggested 
  it 
  miglit 
  be 
  Yei^iVve^L 
  to 
  li^ah/ 
  don 
  

   of 
  Hutton. 
  He 
  overlooked 
  the 
  fact 
  that 
  negledmn 
  is 
  a 
  very 
  

   close 
  ally 
  of 
  scobina, 
  Q. 
  & 
  Gr., 
  with 
  similar 
  apical 
  characters, 
  which 
  is 
  

   as 
  unhappily 
  placed 
  in 
  Purpura, 
  but 
  which 
  is 
  certainly 
  not 
  referable 
  

   to 
  Kahjdon. 
  I 
  have 
  seen 
  no 
  specimens 
  of 
  Drupa 
  showing 
  the 
  apical 
  

  

  