﻿IREDALE 
  : 
  NOTES 
  OjST 
  POLYPLACOPHORA. 
  159 
  

  

  fifty-two 
  s^Decies 
  I 
  consider 
  Adelaidean 
  only 
  five 
  have 
  as 
  yet 
  been 
  

   recognized 
  in 
  the 
  Peroniau 
  fauna. 
  I 
  know 
  only 
  one 
  Damperian 
  

   species 
  which 
  does 
  not 
  elsewhere 
  occur. 
  The 
  solitary 
  Chiton 
  at 
  

   present 
  known 
  from 
  deep 
  water 
  does 
  not 
  concern 
  us. 
  It 
  is 
  of 
  peculiar 
  

   interest 
  that 
  out 
  of 
  the 
  total 
  of 
  ninety- 
  five 
  species 
  only 
  eight 
  do 
  not 
  

   easily 
  become 
  placed. 
  

  

  Ischiiochiton 
  crispus, 
  E-eeve, 
  Lorica 
  volvox, 
  lleeve, 
  Loricella 
  Angasi, 
  

   Ad., 
  and 
  Acanthochites 
  Sueurii, 
  lilainv., 
  appear 
  to 
  be 
  as 
  plentiful 
  in 
  

   the 
  Peronian 
  as 
  in 
  the 
  Adelaidean, 
  whilst 
  the 
  last-named 
  ranges 
  into 
  

   the 
  Solanderian. 
  Liolopliura 
  Gaimardi, 
  Blainv., 
  is 
  placed 
  by 
  Hedley 
  

   as 
  a 
  characteristic 
  Peronian 
  mollusc, 
  but 
  I 
  should 
  consider 
  it 
  

   Solanderian. 
  Callistochiton 
  antiquus, 
  Eeeve, 
  though 
  found 
  of 
  large 
  

   size 
  in 
  South 
  Australia, 
  seems 
  Solanderian, 
  but 
  I 
  have 
  not 
  sufficient 
  

   data 
  to 
  decide. 
  

  

  Callochiton 
  inornatus, 
  Ten.-Wds., 
  I 
  suggest 
  should 
  be 
  attached 
  to 
  the 
  

   Peronian 
  fauna. 
  The 
  Chiton 
  near 
  Coxi, 
  Pilsbry, 
  may 
  be 
  Solanderian, 
  

   but 
  I 
  doubt 
  it. 
  All 
  the 
  preceding 
  figures 
  will 
  need 
  revision 
  when 
  

   Gippsland 
  and 
  Eastern 
  Tasmania 
  receive 
  as 
  careful 
  attention 
  as 
  South 
  

   Australia, 
  Port 
  Phillip, 
  or 
  Port 
  Jackson 
  have 
  done. 
  JN^evertheless, 
  it 
  

   will 
  be 
  seen 
  that 
  study 
  of 
  the 
  Chiton 
  faunas 
  shows 
  the 
  extreme 
  

   localization 
  of 
  species, 
  and 
  consequently 
  points 
  to 
  some 
  appai'ent 
  

   misidentifications 
  in 
  the 
  preceding 
  lists. 
  

  

  Cliiton 
  pulchcrrimus, 
  Sowb., 
  included 
  in 
  Hedley's 
  Catalogue, 
  would 
  

   appear 
  to 
  need 
  another 
  name, 
  Sowerby's 
  species 
  being 
  recorded 
  from 
  

   Pohol 
  Island, 
  Philippines. 
  Tonicia 
  confossa, 
  Gould, 
  also 
  in 
  Hedley's 
  

   list, 
  needs 
  reconsideration, 
  though 
  this 
  latter 
  is 
  more 
  probable 
  than 
  the 
  

   former, 
  the 
  species 
  of 
  Tonicia 
  having 
  a 
  wider 
  range 
  than 
  those 
  of 
  

   Chiton, 
  but 
  neither 
  extend 
  far. 
  

  

  The 
  record 
  of 
  Lejndopleurus 
  cancellatus, 
  Sowb., 
  from 
  Victoria 
  is 
  

   obviously 
  incorrect 
  ; 
  another 
  dubious 
  record 
  from 
  that 
  locality 
  is 
  

   Ischnochiton 
  arlutum, 
  lleeve 
  ; 
  when 
  described, 
  no 
  locality 
  was 
  known 
  ; 
  

   Pilsbry 
  has 
  added 
  Port 
  Essington. 
  From 
  the 
  preceding 
  lists 
  it 
  i 
  

   argued 
  that 
  both 
  records 
  cannot 
  be 
  accepted. 
  I 
  do 
  not 
  know 
  where 
  

   the 
  type 
  was 
  collected, 
  so 
  have 
  included 
  Gatliff 
  and 
  Gabriel's 
  shell, 
  

   though 
  the 
  identification 
  is 
  questionable. 
  

  

  The 
  Euronotian 
  Chiton 
  fauna 
  is 
  characterized 
  by 
  an 
  extraordinary 
  

   development 
  of 
  the 
  genera 
  Ischnochiton 
  and 
  Acanthochites; 
  of 
  both 
  

   these, 
  species 
  are 
  much 
  more 
  numerous 
  in 
  the 
  Adelaidean 
  Eegion. 
  

  

  Hedley 
  has 
  stated 
  that 
  a 
  collection 
  of 
  Marine 
  Molluscs 
  received 
  

   from 
  Geraldton, 
  West 
  Australia, 
  was 
  essentially 
  Adelaidean, 
  though 
  

   masked 
  by 
  an 
  overlap 
  of 
  Indo-Pacific 
  forms. 
  I 
  conclude 
  that 
  the 
  

   Chiton 
  fauna 
  of 
  West 
  Australia 
  will 
  be 
  of 
  a 
  most 
  interesting 
  nature. 
  

   It 
  will 
  contain 
  representatives 
  of 
  the 
  Adelaidean 
  Region, 
  Damperian 
  

   species 
  will 
  also 
  occur, 
  and 
  I 
  anticipate 
  the 
  existence 
  of 
  a 
  few 
  peculiar 
  

   forms 
  representing 
  the 
  Autochthonian 
  element. 
  

  

  I 
  have 
  omitted 
  from 
  consideration 
  the 
  species 
  described 
  by 
  

   Blainville, 
  Ptochebrune, 
  etc., 
  from 
  "New 
  Holland", 
  which 
  have 
  not 
  

   yet 
  been 
  recognized, 
  as 
  they 
  probably 
  appear 
  in 
  the 
  lists 
  under 
  

   different 
  names. 
  

  

  I 
  have 
  just 
  been 
  looking 
  up 
  records 
  of 
  marine 
  molluscs 
  from 
  West 
  

  

  