﻿104 
  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIEXr. 
  

  

  Ischnochiton 
  with 
  extraordiuaiy 
  lateral 
  sculpture 
  was 
  all 
  it 
  impressed 
  

   lis 
  as. 
  The 
  girdle-scales 
  were 
  certainly 
  slightly 
  abnormal, 
  in 
  that 
  

   they 
  were 
  more 
  regular 
  than 
  those 
  of 
  " 
  contractus 
  " 
  auctt., 
  with 
  little 
  

   or 
  no 
  leaning 
  to 
  the 
  fniticosus 
  style. 
  We 
  found, 
  however, 
  that 
  all 
  

   the 
  median 
  valves 
  had 
  two, 
  three, 
  or 
  four 
  slits, 
  instead 
  of 
  the 
  single 
  

   one 
  anticipated 
  by 
  us. 
  Consequently 
  it 
  fell 
  into 
  Pilsbry's 
  subgenus 
  

   Isclmoradsia, 
  which 
  in 
  no 
  other 
  item 
  did 
  it 
  resemble. 
  While 
  this 
  

   proved 
  the 
  inadvisability 
  of 
  accepting 
  Pilsbry's 
  differential 
  features 
  it 
  

   did 
  not 
  relieve 
  us 
  from 
  our 
  dilemma. 
  We 
  purpose 
  having 
  the 
  animal 
  

   investigated 
  and 
  will 
  then 
  decide 
  as 
  to 
  its 
  exact 
  status. 
  In 
  the 
  mean- 
  

   while, 
  to 
  fix 
  the 
  peculiar 
  systematic 
  position 
  of 
  the 
  species 
  we 
  provide 
  

   for 
  it 
  the 
  new 
  subgeneric 
  term 
  Anisoradsia. 
  

  

  When 
  Hull 
  described 
  Ischnochiton 
  falcatus 
  he 
  recorded 
  that 
  he 
  had 
  

   received 
  the 
  same 
  species 
  from 
  one 
  of 
  us 
  under 
  the 
  name 
  /. 
  tateanus, 
  

   concluding 
  that 
  an 
  error 
  had 
  been 
  made 
  by 
  Tate 
  & 
  May 
  in 
  1901 
  when 
  

   they 
  included 
  the 
  latter 
  species 
  in 
  the 
  Kevised 
  Census. 
  Confusion 
  

   occurred 
  through 
  this 
  note, 
  and 
  consequent!}' 
  neither 
  species 
  appeared 
  

   in 
  May 
  & 
  Torr's 
  List, 
  whereas 
  the 
  fact 
  is 
  that 
  both 
  species 
  or 
  their 
  

   representatives 
  do 
  occur, 
  and 
  were 
  dredged 
  together. 
  Further, 
  either 
  

   /. 
  falcatus 
  or 
  a 
  nearly 
  allied 
  shell 
  also 
  occurs 
  in 
  South 
  Australian 
  

   Avaters. 
  The 
  Tasraanian 
  and 
  South 
  Australian 
  shells 
  known 
  as 
  

   I. 
  crispus 
  (Keeve) 
  differ 
  appreciably 
  from 
  New 
  South 
  Wales 
  shells, 
  

   which 
  are 
  typical, 
  as 
  shown 
  by 
  the 
  types 
  in 
  the 
  British 
  Museum. 
  

   The 
  Victorian 
  shell 
  received 
  as 
  a 
  varietal 
  name 
  deeorata 
  by 
  Sykes, 
  

   and 
  at 
  the 
  present 
  time 
  this 
  may 
  be 
  used 
  specifically 
  for 
  the 
  Victorian, 
  

   Tasmanian, 
  and 
  South 
  Australian 
  form. 
  

  

  7. 
  Chiton 
  longicymba, 
  Blainville. 
  

  

  Blainville 
  described 
  this 
  species 
  in 
  1825. 
  Quoy 
  & 
  Gaimard 
  utilized 
  

   this 
  name 
  for 
  a 
  common 
  Ischnochiton 
  found 
  in 
  Australia 
  and 
  New 
  

   Zealand. 
  This 
  usage 
  persisted 
  until 
  1 
  892, 
  when 
  Pilsbry 
  separated 
  the 
  

   Australian 
  species 
  from 
  the 
  Neozelanic, 
  retaining 
  the 
  above 
  name 
  as 
  

   of 
  Quoy 
  & 
  Gaimard 
  for 
  the 
  latter, 
  definitely 
  stating 
  that 
  this 
  was 
  not 
  

   Blainville's 
  species. 
  This 
  disposition 
  was 
  accepted 
  until 
  one 
  of 
  us 
  

   indicated 
  the 
  falsity 
  of 
  this 
  procedure 
  and 
  definitely 
  distinguished 
  the 
  

   Neozelanic 
  shell 
  with 
  a 
  new 
  name. 
  This, 
  however, 
  did 
  not 
  finish 
  

   the 
  matter, 
  for 
  Blainville's 
  species 
  still 
  remained 
  unrecognized. 
  The 
  

   same 
  writer 
  has 
  continually 
  endeavoured 
  to 
  fix 
  this 
  name 
  and 
  so 
  

   eff"ectually 
  rid 
  our 
  nomenclature 
  of 
  an 
  irritating 
  item. 
  The 
  constant 
  

   examination 
  of 
  the 
  present 
  collections 
  has 
  enabled 
  us 
  to 
  record 
  

   a 
  favourable, 
  though 
  quite 
  unanticipated, 
  result. 
  Blainville's 
  descrip- 
  

   tion 
  not 
  being 
  commonly 
  accessible, 
  we 
  here 
  transcribe 
  it 
  : 
  — 
  

   " 
  C[}uton~] 
  longicymba^ 
  Dufr. 
  (Blainville, 
  Diet. 
  Sci. 
  Nat. 
  (Levrault), 
  

   vol. 
  xxxvi, 
  1825, 
  p. 
  542). 
  

  

  " 
  Corps 
  tres-alonge, 
  tres-etroit 
  ; 
  limbe 
  convert 
  de 
  tres-petites 
  

   ecailles 
  comme 
  farineuses 
  ; 
  coquille 
  tres-longue, 
  composee 
  de 
  huit 
  

   valves 
  grandes, 
  croissant 
  de 
  la 
  premiere 
  a 
  la 
  derniere, 
  convexes 
  et 
  

   parfaitement 
  lisses 
  ; 
  les 
  intermediaires 
  avec 
  des 
  aires 
  laterales 
  larges, 
  

   distinctes 
  par 
  une 
  saillie 
  anguleuse 
  ; 
  couleur 
  generale 
  d'un 
  vert 
  

   brunatre, 
  varie 
  ou 
  panache 
  de 
  petites 
  taches 
  blanches, 
  plus 
  larges 
  sur 
  

  

  