﻿ieedale: 
  on 
  the 
  ' 
  sinusigeea 
  apex'. 
  77 
  

  

  apices. 
  In 
  these 
  the 
  Simisigera 
  character 
  is 
  obscured, 
  owing 
  to 
  the 
  

   similarity 
  in 
  colour 
  of 
  the 
  apex 
  to 
  the 
  adult 
  shell. 
  One 
  young 
  one 
  

   which 
  was 
  traced 
  to 
  spiratus, 
  Adams, 
  was, 
  however, 
  whitish, 
  followed 
  

   by 
  a 
  pink 
  post-embryonic 
  shell. 
  I 
  allude 
  to 
  these 
  further 
  in 
  the 
  

   succeeding 
  notes. 
  A 
  shell 
  which 
  appears 
  to 
  be 
  novel 
  and 
  referable 
  to 
  

   Cantharus 
  has 
  a 
  Sijiusigera 
  apex, 
  almost 
  indistinguishable 
  from 
  that 
  

   possessed 
  by 
  Thais 
  chaidea^ 
  Duclos. 
  From 
  that 
  character 
  I 
  conclude, 
  

   if 
  this 
  shell 
  is 
  new, 
  that 
  it 
  will 
  not 
  be 
  long 
  before 
  it 
  is 
  again 
  recorded, 
  

   and 
  perhaps 
  from 
  some 
  far 
  distant 
  locality. 
  

  

  From 
  these 
  instances 
  it 
  will 
  be 
  seen 
  that. 
  the 
  Sinusigera 
  is 
  certainly 
  

   represented 
  in 
  many 
  genera, 
  as 
  widely 
  understood 
  at 
  present. 
  I 
  should 
  

   therefore 
  state 
  that 
  no 
  species 
  should 
  be 
  allotted 
  to 
  a 
  group 
  of 
  which 
  

   the 
  type 
  has 
  been 
  shown 
  to 
  possess 
  a 
  Sinusigera 
  apex, 
  unless 
  it 
  also 
  

   possess 
  such 
  an 
  apex. 
  And 
  I 
  would 
  anticipate 
  that 
  all 
  such 
  groups 
  

   will 
  later 
  be 
  raised 
  to 
  the 
  rank 
  of 
  genera. 
  It 
  is 
  also 
  possible 
  in 
  tlie 
  

   latter 
  case 
  that 
  differences 
  in 
  the 
  Sinusigera 
  will 
  be 
  useful 
  in 
  group- 
  

   classifying. 
  The 
  discovery 
  of 
  the 
  Sinusigera 
  in 
  the 
  Alectrionidae 
  

   appears 
  to 
  me 
  especially 
  important, 
  as 
  such 
  an 
  aid 
  may 
  considerably 
  

   reduce 
  the 
  work 
  necessary 
  in 
  the 
  revision 
  of 
  the 
  species 
  of 
  that 
  

   puzzling 
  family. 
  I 
  have 
  only 
  seen 
  one 
  species 
  of 
  Arcularia 
  possessing 
  

   an 
  apex, 
  and 
  though 
  that 
  was 
  not 
  perfect 
  it 
  was 
  sufficient 
  to 
  decide 
  

   it 
  was 
  not 
  of 
  the 
  Simisigera 
  type. 
  Deep-water 
  species 
  of 
  Alectrion, 
  

   from 
  figures, 
  do 
  not 
  seem 
  to 
  have 
  Sinusigera 
  apices. 
  

  

  Alectrion 
  gaudiosus. 
  Hinds. 
  

   JVassa 
  gaudiosa, 
  Hinds, 
  Voy. 
  Sulphur, 
  1844, 
  p. 
  36, 
  pi. 
  ix, 
  figs. 
  16, 
  17, 
  

   JV. 
  zonalis, 
  A. 
  Ad.: 
  Suter, 
  Trans. 
  N. 
  Zeal. 
  Inst., 
  1905 
  (1906), 
  

   vol. 
  xxxviii, 
  p. 
  331. 
  

   Under 
  gaudiosa, 
  Hinds, 
  many 
  names 
  are 
  grouped 
  by 
  Tryon, 
  and 
  

   amongst 
  these 
  is 
  zonalis, 
  A. 
  Ad. 
  The 
  shells 
  I 
  collected 
  on 
  Sunday 
  

   Island 
  agree 
  well 
  with 
  Hinds' 
  type, 
  and 
  disagree 
  with 
  Adams' 
  types. 
  

   This 
  species 
  was 
  rarely 
  cast 
  up 
  on 
  the 
  beach, 
  and 
  young 
  shells 
  occurred 
  

   in 
  dredgings. 
  From 
  these 
  the 
  characters 
  of 
  the 
  apex 
  were 
  obtained 
  : 
  

   four-whorled, 
  rapidly 
  increasing, 
  shining, 
  smooth, 
  Sinusigera 
  in 
  form, 
  

   the 
  upper 
  half 
  dark 
  brown, 
  the 
  lower 
  half 
  pale 
  fawnish. 
  This 
  

   Sinusigera 
  is 
  more 
  globular 
  than 
  those 
  belonging 
  to 
  Purpuroid 
  shells. 
  

  

  Alecteion 
  spikatus, 
  a. 
  Adams. 
  

   Nassa 
  spirata, 
  A. 
  Ad., 
  Proc. 
  Zool. 
  Soc, 
  1851, 
  p. 
  106. 
  

  

  A 
  shell 
  commoner 
  than 
  the 
  preceding 
  upon 
  the 
  beach 
  agreed 
  with 
  

   shells 
  from 
  Lord 
  Howe 
  Island 
  and 
  also 
  jN'ew 
  South 
  Wales. 
  In 
  the 
  

   Australian 
  Museum 
  such 
  shells 
  were 
  labelled 
  glans^ 
  L., 
  but 
  with 
  this 
  

   determination 
  I 
  disagree. 
  My 
  specimens 
  were 
  found 
  to 
  coincide 
  with 
  

   the 
  types 
  of 
  spirafa 
  from 
  Swan 
  Kiver, 
  West 
  Australia. 
  It 
  is 
  worth 
  

   describing 
  in 
  detail 
  : 
  Protoconch 
  Sinusigera 
  in 
  form, 
  whitish, 
  of 
  four 
  

   whorls, 
  rapidly 
  increasing, 
  shining; 
  this 
  is 
  usually 
  missing 
  from 
  adult 
  

   shells. 
  The 
  next 
  two 
  whorls 
  are 
  bright 
  pink, 
  each 
  sculptured 
  by 
  

   about 
  fourteen 
  longitudinal 
  ribs 
  which 
  are 
  overridden 
  by 
  four 
  spiral 
  

   cords. 
  In 
  the 
  next 
  whorl 
  these 
  spirals 
  fade 
  away 
  and 
  vanish, 
  and 
  on 
  

   the 
  succeeding 
  whorls 
  the 
  longitudinals 
  follow 
  their 
  example, 
  and 
  

  

  