﻿lEEDALE 
  & 
  MAY 
  : 
  MISNAMKD 
  TASMANIAN 
  CHITONS. 
  105 
  

  

  la 
  ligne 
  dorsale. 
  Cette 
  jolie 
  espece 
  existe 
  dans 
  la 
  collection 
  du 
  

   Museum 
  ; 
  elle 
  provient 
  des 
  rivages 
  de 
  I'ile 
  King." 
  

  

  The 
  recognition 
  of 
  this 
  species 
  is 
  very 
  easy 
  when 
  the 
  keynote 
  is 
  

   touched. 
  Hitherto 
  we 
  have 
  always 
  been 
  searching 
  in 
  tlie 
  wrong 
  

   place, 
  looking 
  at 
  Ischnochitons 
  with 
  sculpture, 
  whereas 
  Blainville 
  

   wrote 
  " 
  valves 
  . 
  . 
  . 
  parfaitement 
  lisses 
  ". 
  

  

  Rochebrune 
  described 
  a 
  large 
  number 
  of 
  Chitons 
  in 
  the 
  Paris 
  

   Museum, 
  generally 
  hiding 
  every 
  clue 
  to 
  their 
  identity 
  under 
  

   a 
  peculiarly 
  false 
  generic 
  location. 
  Thus 
  he 
  described 
  Schizochiton 
  

   nympha 
  (Bull. 
  Soc. 
  Philom. 
  Paris, 
  ser. 
  vir, 
  vol. 
  viii, 
  p. 
  36, 
  1884) 
  from 
  

   King 
  Island, 
  collected 
  by 
  Peron 
  & 
  Lesueur. 
  No 
  one 
  could 
  possibly 
  

   be 
  expected 
  to 
  guess 
  that 
  so 
  far 
  from 
  being 
  a 
  Schizochiton, 
  this 
  species 
  

   was 
  exactly 
  the 
  opposite 
  in 
  every 
  generic 
  feature, 
  being 
  a 
  Stenochiton. 
  

   Yet 
  Thiele, 
  from 
  an 
  examination 
  of 
  Rochebrune'stype, 
  has 
  showed 
  this 
  

   and 
  given 
  figures 
  to 
  support 
  his 
  conclusions. 
  In 
  a 
  similar 
  case 
  one 
  of 
  

   us 
  showed 
  that 
  Bochebrune 
  had 
  redescribed 
  the 
  type 
  of 
  a 
  species 
  

   named 
  by 
  Quoy 
  & 
  Gaimard, 
  and 
  this 
  enabled 
  us 
  to 
  reconcile 
  the 
  loss 
  

   of 
  the 
  type 
  of 
  C. 
  longici/mha, 
  Blainville, 
  with 
  the 
  presence 
  of 
  Schizo- 
  

   chiton 
  nytnpha, 
  Bochebrune. 
  

  

  From 
  Thiele's 
  description 
  and 
  figures 
  there 
  is 
  certainty 
  that 
  

   Rocliebrune 
  renamed 
  the 
  Blainvillean 
  species, 
  and 
  that 
  Chiton 
  

   longicymha, 
  Blainville, 
  is 
  a 
  Stenorhiton. 
  Thiele 
  does 
  not 
  definitely 
  

   make 
  this 
  a 
  synonym 
  of 
  Stenochiton 
  juloides, 
  H. 
  Adams 
  & 
  Angas, 
  

   and 
  until 
  King 
  Island 
  specimens 
  are 
  again 
  collected 
  we 
  prefer 
  to 
  

   allow 
  Stenochiton 
  longicymha 
  (Blainville) 
  as 
  a 
  separate 
  species. 
  

   Blainville 
  definitely 
  named 
  four 
  species 
  as 
  coming 
  from 
  King 
  Island, 
  

   viz. 
  C. 
  lineolatus, 
  C. 
  longicymha, 
  C. 
  hirtosus, 
  and 
  C. 
  albidns. 
  Thiele 
  

   disposed 
  of 
  the 
  last 
  two, 
  and 
  we 
  now 
  recognize 
  the 
  two 
  first-named. 
  

   Thus 
  C. 
  lineolatus 
  is 
  later 
  shown 
  to 
  be 
  the 
  species 
  known 
  as 
  " 
  /. 
  co7i- 
  

   tractus. 
  Reeve 
  ", 
  but 
  which 
  is 
  not 
  Reeve's 
  species. 
  The 
  status 
  of 
  

   C. 
  longicymha 
  has 
  just 
  been 
  discussed, 
  while 
  C. 
  albidns 
  from 
  examina- 
  

   tion 
  of 
  the 
  type-specimen 
  still 
  existing 
  must 
  be 
  used 
  for 
  one 
  of 
  the 
  

   common 
  species 
  of 
  Plaxij)hora. 
  

  

  Though 
  Thiele 
  recorded 
  that 
  C. 
  hirtosus 
  was 
  based 
  on 
  the 
  shell 
  

   later 
  described 
  by 
  Quoy 
  & 
  Gaimard 
  as 
  C. 
  georgianus, 
  from 
  King 
  

   George's 
  Sound, 
  and 
  therefore 
  the 
  locality 
  " 
  King 
  Island 
  " 
  was 
  

   erroneous, 
  he 
  did 
  not 
  use 
  it. 
  We 
  had 
  referred 
  the 
  species 
  to 
  the 
  

   genus 
  Sclerochiton, 
  though 
  Thiele 
  selected 
  Liolophura, 
  but 
  here 
  we 
  

   simply 
  note 
  that 
  Sclerochiton 
  is 
  untenable, 
  the 
  name 
  being 
  preoccupied, 
  

   and 
  for 
  the 
  Chitons 
  so 
  named, 
  Squamopleura, 
  Nierstrasz, 
  seems 
  avail- 
  

   able 
  : 
  of 
  which 
  more 
  at 
  a 
  later 
  opportunity. 
  

  

  8. 
  Heteeozona 
  subvikidis, 
  n.sp. 
  PI. 
  IV, 
  Fig. 
  2. 
  

  

  Shell 
  of 
  full 
  size 
  for 
  the 
  genus, 
  elliptical, 
  valves 
  low, 
  semi-carinate, 
  

   keel 
  often 
  obsolete, 
  side 
  slopes 
  arched, 
  valves 
  not 
  beaked. 
  Colour 
  

   varied, 
  generally 
  of 
  shades 
  of 
  blue-green 
  with 
  lighter 
  stripes 
  and 
  

   mottling; 
  many 
  specimens 
  show 
  a 
  dark 
  dorsal 
  stripe 
  succeeded 
  on 
  

   each 
  side 
  by 
  whitish 
  stripes; 
  some 
  specimens 
  combine 
  with 
  thebhiish 
  

   shell 
  a 
  beautiful 
  red-brown 
  girdle, 
  others 
  even 
  a 
  golden 
  girdle, 
  

   though 
  usually 
  the 
  girdle 
  is 
  darker 
  blue-green. 
  The 
  characteristic 
  

  

  