﻿74 
  PROCEEDINGS 
  OP 
  THE 
  MALACOIOGICAL 
  SOCIETY. 
  

  

  Epiionium 
  PERPLExim, 
  Pease. 
  

   This 
  species 
  has 
  already 
  been 
  recorded 
  from 
  the 
  Kermadecs 
  by 
  Suter 
  

   (Journ. 
  Malac, 
  1899, 
  vol. 
  vii, 
  p. 
  54), 
  under 
  the 
  name 
  of 
  Scalaria 
  

   australis. 
  Lam. 
  

  

  Ianthina 
  umbilicata, 
  d'Orb. 
  

  

  D'Orbigny 
  described 
  this 
  species 
  (Voy. 
  Amer. 
  Merid., 
  1847, 
  p. 
  414, 
  

   No. 
  319), 
  carefully 
  comparing 
  it 
  with 
  exigua, 
  Lam., 
  the 
  preceding 
  

   species, 
  of 
  which 
  he 
  wrote 
  : 
  " 
  Cette 
  espece 
  habite 
  toutl'ocean 
  Atlantique 
  

   dans 
  les 
  regions 
  chaudes," 
  and 
  of 
  this 
  he 
  stated: 
  " 
  Elle 
  se 
  trouve 
  

   encore 
  dans 
  les 
  memes 
  circon 
  stances." 
  Yet 
  Reeve 
  (Conch. 
  Icon., 
  

   1858, 
  pi. 
  V, 
  figs. 
  11a-b^ 
  sp. 
  22) 
  refers 
  to 
  it 
  as 
  a 
  manuscript 
  name 
  of 
  

   d'Orbigny's 
  in 
  the 
  British 
  Museum, 
  attached 
  to 
  a 
  shell 
  of 
  unknown 
  

   habitat. 
  Tryon 
  includes 
  it 
  doubtfully 
  as 
  a 
  synonym 
  of 
  exigua^ 
  Lam. 
  

   (Man. 
  Conch., 
  vol. 
  ix, 
  p. 
  38, 
  pi. 
  x, 
  figs. 
  21, 
  22). 
  

  

  It 
  would 
  appear 
  to 
  be 
  a 
  rare 
  shell. 
  I 
  have 
  seen 
  specimens 
  in 
  the 
  

   British 
  Museum 
  from 
  the 
  Sandwich 
  Islands 
  and 
  North 
  Pacific, 
  as 
  well 
  

   as 
  my 
  Kermadec 
  specimens. 
  It 
  has 
  the 
  form 
  of 
  exigua, 
  Lam., 
  but, 
  

   being 
  destitute 
  of 
  the 
  rough 
  sculpture 
  of 
  that 
  shell, 
  has 
  a 
  shiny 
  

   appearance, 
  and 
  immediately 
  attracts 
  attention. 
  The 
  striae 
  are 
  very 
  

   fine, 
  no 
  moi'e 
  pronounced 
  than 
  in 
  gloiosa, 
  Swainson. 
  

  

  Tryon 
  allows 
  as 
  varieties 
  of 
  /. 
  ianthina, 
  L., 
  planospirata, 
  Ad. 
  & 
  Rve., 
  

   trochoidea, 
  Kve., 
  and 
  brittanica, 
  Leach. 
  I 
  should 
  suppress 
  all 
  three. 
  

   If 
  varieties 
  are 
  required, 
  the 
  most 
  depressed 
  form 
  is 
  depresm, 
  Rve., 
  

   and 
  the 
  most 
  conoidal, 
  trochoidea. 
  This 
  is 
  from 
  an 
  examination 
  of 
  all 
  

   Reeve's 
  types. 
  

  

  On 
  the 
  ' 
  SixusiGEBA 
  Apex 
  '. 
  

  

  Kesteven 
  dealt 
  with 
  the 
  history 
  of 
  the 
  Sinusigera 
  apex 
  up 
  to 
  

   1901 
  (Proc. 
  Linn. 
  Soc. 
  N.S.W., 
  1901, 
  vol. 
  xxvi, 
  pp. 
  533 
  seq.). 
  

   After 
  having 
  shown 
  that 
  tritoniformis, 
  Blain., 
  should, 
  be 
  classed 
  

   as 
  a 
  Purpura 
  as 
  it 
  had 
  a 
  Sinusigera 
  apex 
  very 
  like 
  that 
  of 
  succincta. 
  

   Lam., 
  and 
  that 
  the 
  only 
  two 
  Simisigera 
  embryos 
  previously 
  followed 
  

   to 
  their 
  adult 
  stage 
  had 
  been 
  shown 
  to 
  belong 
  to 
  Purpura, 
  he 
  

   wrote: 
  "I 
  do 
  not 
  expect 
  the 
  embryo 
  of 
  every 
  Purpura 
  to 
  be 
  of 
  

   the 
  Sinusigera 
  type, 
  but 
  every 
  embryo 
  of 
  the 
  type 
  to 
  be 
  that 
  of 
  

   a 
  Purpura." 
  Hedley, 
  in 
  1903 
  (Mem. 
  Aust. 
  Mus.^ 
  vol. 
  iv, 
  p. 
  383), 
  

   endorsed 
  this 
  opinion 
  by 
  describing, 
  as 
  a 
  new 
  species 
  of 
  Purpura, 
  

   a 
  young 
  shell 
  with 
  a 
  beautifull)^ 
  sculptured 
  Sinusigera 
  apex 
  dredged 
  

   in 
  deep 
  water 
  off 
  New 
  South 
  Wales. 
  Two 
  years 
  later 
  he 
  pointed 
  out 
  

   that 
  this 
  was 
  the 
  young 
  of 
  a 
  CoralliopMla 
  (Rec. 
  Aust. 
  Mus., 
  1906, 
  

   vol. 
  vi, 
  p. 
  219). 
  In 
  the 
  same 
  paper 
  (p. 
  217) 
  he 
  records 
  a 
  new 
  species 
  

   of 
  Bittium 
  with 
  a 
  similar 
  apex, 
  writing 
  : 
  " 
  The 
  presence 
  of 
  a 
  Sinusigera 
  

   protoconch 
  is 
  of 
  interest, 
  but 
  we 
  have 
  not 
  sufficient 
  data 
  to 
  now 
  discuss 
  

   its 
  teleological 
  significance." 
  These 
  destroyed 
  Kesteven's 
  conclusions, 
  

   but 
  I 
  still 
  consider 
  the 
  presence 
  of 
  a 
  Sinusigera 
  apex 
  will 
  aid 
  in 
  

   classifying 
  shells 
  into 
  groups, 
  if 
  not 
  genera. 
  I 
  would 
  not 
  class 
  in 
  the 
  

   same 
  group 
  a 
  shell 
  with 
  such 
  an 
  apex 
  with 
  a 
  shell 
  with 
  a 
  different 
  

   apex, 
  and 
  would 
  rewrite 
  Kesteven's 
  dictum 
  thus: 
  "I 
  do 
  expect 
  the 
  

   embryo 
  of 
  every 
  Purpura 
  (or 
  any 
  other 
  sectional 
  name) 
  to 
  be 
  of 
  the 
  

  

  