﻿320 
  PKOCKEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  lobation 
  du 
  labre 
  est 
  tres 
  remarquable." 
  That 
  Triphora 
  owes 
  its 
  

   wide 
  distribution 
  to 
  this 
  factor 
  is 
  apparent, 
  but 
  it 
  seems 
  that 
  the 
  

   animal 
  still 
  swims 
  after 
  the 
  adult 
  whorls 
  are 
  forming, 
  as 
  witness 
  

   Fischer 
  (loc. 
  cit., 
  p. 
  679) 
  : 
  " 
  Nous 
  avons 
  peche 
  en 
  pleine 
  mer, 
  entre 
  

   la 
  Provence 
  et 
  la 
  Corse, 
  un 
  Triforis 
  ferversa., 
  dont 
  la 
  coquille 
  comptait 
  

   8^9 
  tours, 
  et 
  dont 
  I'animal 
  avait 
  les 
  caracteres 
  larvaires." 
  From 
  

   my 
  own 
  observations 
  I 
  should 
  doubt 
  the 
  possibility 
  of 
  such 
  an 
  

   occurrence 
  in 
  connexion 
  with, 
  the 
  ' 
  Thaitid 
  ' 
  Sinusigera. 
  

  

  These 
  * 
  Triforid 
  ' 
  Sinnsigeras 
  are 
  much 
  different 
  in 
  shape 
  and 
  form 
  

   from 
  the 
  ' 
  Thaitid 
  ' 
  Sinusigera. 
  They 
  are 
  much 
  more 
  minute 
  and 
  

   elongate, 
  and 
  the 
  claw 
  is 
  in 
  reality 
  the 
  only 
  resemblance. 
  

  

  Hitherto 
  recorded 
  in 
  the 
  genera 
  Triphora 
  and 
  Bittium 
  they 
  would 
  

   appear 
  to 
  exist 
  in 
  many 
  other 
  genera 
  also. 
  Planaxis 
  Brasiliamis, 
  

   Lamk., 
  was 
  common 
  at 
  Sunday 
  Island, 
  but 
  no 
  adult 
  specimen 
  ever 
  

   showed 
  a 
  perfect 
  apex 
  ; 
  minute 
  dead 
  specimens 
  from 
  shallow 
  water 
  

   dredgings, 
  however, 
  proved 
  it 
  to 
  possess 
  a 
  very 
  minute 
  dark-coloured 
  

   Sinusigera 
  apex. 
  Dall 
  has 
  recently 
  recorded 
  this 
  species 
  from 
  that 
  

   outpost 
  of 
  Pacifica, 
  Easter 
  Island 
  (Bull. 
  Mus. 
  Comp. 
  Zool. 
  Harv., 
  

   vol. 
  xliii, 
  p. 
  437, 
  1908). 
  I 
  have 
  since 
  noted 
  similar 
  apices 
  attached 
  

   to 
  other 
  species 
  of 
  Planaxis. 
  

  

  A 
  shell, 
  once 
  dredged 
  alive 
  at 
  Sunday 
  Island, 
  has 
  been 
  identified 
  as 
  

   Cerithium 
  si?ion, 
  Bayle 
  (Journ. 
  de 
  Conch., 
  vol. 
  xxviii, 
  p. 
  243, 
  1880). 
  

   It 
  was 
  described 
  as 
  Cerithium 
  clathratum 
  by 
  Sowerby 
  (Thes. 
  Conch.., 
  

   vol. 
  ii, 
  p. 
  883, 
  1855) 
  from 
  the 
  Island 
  of 
  Bohol 
  ; 
  it 
  has 
  been 
  recorded 
  

   by 
  Melvill 
  & 
  Standen 
  (Journ. 
  Conch., 
  vol. 
  viii, 
  p. 
  116, 
  1895) 
  from 
  

   Lifu 
  as 
  Cerithiopsis 
  sinon, 
  and 
  there 
  are 
  specimens 
  in 
  the 
  British 
  

   ^luseum 
  from 
  Mauritius. 
  I 
  have 
  seen 
  no 
  adult 
  with 
  a 
  perfect 
  apex, 
  

   but 
  juveniles 
  from 
  dredgings 
  revealed 
  the 
  existence 
  of 
  a 
  minute 
  

   Sinusigera. 
  I 
  don't 
  know 
  where 
  to 
  generically 
  locate 
  this 
  shell, 
  but 
  

   it 
  is 
  certainly 
  neither 
  a 
  Cerithium 
  nor 
  a 
  Cerithiopsis. 
  Other 
  juvenile 
  

   Cerithioids 
  from 
  the 
  dredgings 
  also 
  showed 
  minute 
  Sinusigera 
  apices, 
  

   but 
  here 
  again 
  no 
  adults 
  were 
  obtained. 
  The 
  suggestion 
  that 
  Cerithium 
  

   also 
  travels 
  by 
  means 
  of 
  a 
  Sinusigera 
  I 
  have 
  not 
  yet 
  been 
  able 
  to 
  

   confirm, 
  but 
  I 
  feel 
  certain 
  that 
  such 
  will 
  prove 
  to 
  be 
  the 
  case. 
  

  

  A 
  shell 
  I 
  did 
  not 
  collect 
  at 
  Sunday 
  Island, 
  but 
  which 
  has 
  since 
  

   come 
  to 
  ray 
  notice, 
  is 
  a 
  species 
  of 
  Fenella. 
  I 
  suggest 
  that 
  the 
  minute 
  

   many-whorled 
  apex 
  of 
  Ohtortio 
  is 
  of 
  a 
  Sinusigera 
  character. 
  

  

  In 
  recent 
  years 
  scarcely 
  any 
  scientific 
  worker 
  has 
  described 
  a 
  new 
  

   minute 
  shell 
  without 
  carefully 
  detailing 
  the 
  apical 
  characters 
  and 
  

   using 
  them 
  for 
  classificatory 
  purposes. 
  Yet 
  these 
  same 
  workers 
  have 
  

   been 
  content 
  to 
  class 
  larger 
  well-known 
  shells 
  in 
  an 
  almost 
  Linnean 
  

   fashion. 
  To 
  specify 
  a 
  glaring 
  instance, 
  the 
  northern 
  lapillus, 
  Linne, 
  

   is 
  classed 
  with 
  the 
  southern 
  succincta, 
  Lamarck, 
  in 
  Thais. 
  But 
  the 
  

   apices 
  of 
  both 
  these 
  species 
  are 
  well 
  known 
  and 
  are 
  quite 
  dissimilar. 
  

   In 
  the 
  paper 
  quoted 
  I 
  wrote: 
  "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." 
  

  

  Since 
  this 
  was 
  written 
  I 
  have 
  noted 
  that 
  I 
  had 
  been 
  anticipated 
  by 
  

  

  