﻿98 
  I'ROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  further, 
  Tredale 
  desires 
  to 
  place 
  on 
  record 
  at 
  this, 
  the 
  earliest, 
  

   opportunity, 
  his 
  gratitude 
  to 
  Dr. 
  Torr 
  for 
  the 
  gift 
  of 
  an 
  unequalled 
  

   and 
  complete 
  series 
  of 
  South 
  Australian 
  shells, 
  whereby 
  definiteness 
  

   has 
  been 
  gained 
  in 
  connexion 
  with 
  typical 
  Adelaideau 
  forms. 
  We 
  

   have 
  continually 
  referred 
  to 
  Torr's 
  papers, 
  and, 
  though 
  the 
  nomen- 
  

   clature 
  needs 
  revision, 
  these 
  mark 
  an 
  epoch 
  in 
  the 
  study 
  of 
  Australian 
  

   Chitons, 
  being 
  based 
  on 
  personal 
  experience, 
  whilst 
  his 
  field 
  notes 
  are 
  

   very 
  valuable. 
  

  

  The 
  types 
  of 
  the 
  new 
  species 
  will 
  be 
  presented 
  to 
  the 
  Tasmanian 
  

   Museum, 
  Hobart. 
  These 
  are 
  undissected 
  shells 
  which 
  have 
  been 
  

   figured 
  as 
  such 
  ; 
  detail 
  figures 
  will 
  be 
  later 
  given 
  from 
  dissected 
  

   paratypes. 
  

  

  II. 
  Systematic 
  Notes. 
  

  

  We 
  preface 
  our 
  corrections 
  and 
  descriptions 
  of 
  new 
  species 
  with 
  

   a 
  few 
  words 
  of 
  explanation 
  and 
  warning. 
  The 
  list 
  given 
  above 
  needs 
  

   extensive 
  revision, 
  and 
  we 
  have 
  to 
  point 
  out 
  one 
  general 
  reason. 
  

   Many 
  species 
  were 
  described 
  by 
  Reeve 
  from 
  the 
  Cuming 
  Collection 
  

   and 
  British 
  Museum. 
  Reeve 
  only 
  described 
  and 
  figured 
  one 
  specimen 
  

   of 
  each 
  species, 
  and 
  very 
  fortunately 
  his 
  artist 
  painted 
  the 
  shell 
  

   carefully. 
  We 
  are 
  thus 
  able 
  to 
  trace 
  the 
  individual 
  which 
  must 
  

   be 
  regarded 
  as 
  the 
  type. 
  When 
  Pilsbry 
  prepared 
  his 
  monograph 
  he 
  

   was 
  dependent 
  upon 
  Carpenter's 
  MS. 
  notes 
  on 
  these 
  shells, 
  and 
  

   Carpenter 
  did 
  not 
  differentiate 
  this 
  figured 
  shell. 
  The 
  onl}' 
  worker 
  

   who 
  has 
  since 
  determined 
  Australian 
  shells 
  by 
  direct 
  comparison 
  with 
  

   the 
  British 
  Museum 
  material 
  also 
  overlooked 
  this 
  item, 
  which 
  now 
  

   proves 
  important. 
  One 
  of 
  us 
  has 
  endeavoured 
  to 
  fix 
  these 
  figured 
  

   shells, 
  and 
  hereafter 
  we 
  record 
  some 
  results, 
  but 
  we 
  would 
  note 
  that 
  

   complications 
  may 
  yet 
  occur. 
  

  

  The 
  word 
  of 
  warning 
  is 
  in 
  connexion 
  with 
  the 
  description 
  of 
  new 
  

   species 
  from 
  unique 
  examples 
  of 
  which 
  we 
  do 
  not 
  as 
  yet 
  know 
  

   the 
  variation 
  and 
  evolution 
  through 
  their 
  growth 
  stages. 
  Hence, 
  

   while 
  geographically 
  species 
  can 
  be 
  easily 
  named 
  and 
  thus 
  variation 
  

   gauged, 
  it 
  is 
  impossible 
  to 
  apply 
  the 
  knowledge 
  so 
  gained 
  from 
  

   one 
  species 
  to 
  another 
  case 
  even 
  in 
  the 
  same 
  genus. 
  The 
  growth 
  of 
  

   sculpture 
  and 
  development 
  of 
  girdle-scales 
  need 
  careful 
  investigation, 
  

   for 
  we 
  find 
  that 
  the 
  young 
  of 
  some 
  species 
  of 
  Ischnochiton 
  differ 
  

   in 
  both 
  these 
  items 
  from 
  tlie 
  adult 
  and 
  senile 
  phases. 
  We 
  have 
  

   now 
  before 
  us 
  almost 
  twenty 
  different 
  species 
  represented 
  by 
  a 
  few 
  

   specimens 
  ; 
  most 
  of 
  these 
  are 
  very 
  distinct, 
  but 
  we 
  withhold 
  

   descriptions 
  until 
  possessed 
  of 
  more 
  material 
  that 
  will 
  illustrate 
  the 
  

   growth 
  stages. 
  It 
  is 
  also 
  necessary 
  to 
  use 
  the 
  microscope 
  in 
  connexion 
  

   with 
  each 
  specimen, 
  though 
  we 
  have 
  found 
  it 
  an 
  infallible 
  law 
  that 
  

   the 
  strange 
  appearance 
  of 
  a 
  shell 
  is 
  the 
  first 
  attraction, 
  and 
  that 
  in 
  no 
  

   case 
  are 
  species 
  so 
  alike 
  that 
  no 
  superficial 
  difference 
  is 
  apparent 
  at 
  

   first 
  sight. 
  

  

  1. 
  Chiton 
  inqtjinatus, 
  Reeve. 
  

  

  This 
  species 
  was 
  described 
  from 
  " 
  VanDieman's 
  Land 
  ; 
  Dr. 
  Sinclair 
  ". 
  

   In 
  1896 
  Sykes 
  dissected 
  one 
  of 
  the 
  type-specimens 
  and 
  found 
  it 
  to 
  

   he 
  a 
  Lepidopleurus, 
  and 
  recorded 
  the 
  species 
  from 
  Victoria, 
  while 
  

  

  