﻿153 
  

  

  NOTES 
  OJSr 
  POLYPLACOPHORA, 
  CHIEFLY 
  AUSTEALASIAN. 
  (Part 
  II.) 
  

   By 
  Tom 
  Iredale. 
  

  

  Read 
  Uth 
  May, 
  1910. 
  

   The 
  GENtrs 
  Eudoxoceiton. 
  

  

  On 
  Sunday 
  Island, 
  Kermadec 
  Group, 
  I 
  collected 
  two 
  small 
  shells 
  

   which 
  superficially 
  seemed 
  referable 
  to 
  Callochiton. 
  The 
  girdle 
  

   appeared 
  to 
  be 
  composed 
  of 
  minute 
  diamond-shaped 
  scales, 
  whilst 
  

   internally 
  the 
  sutural 
  laminae 
  were 
  connected. 
  They 
  were, 
  however, 
  

   traced 
  to 
  Eudoxochiton. 
  Upon 
  microscopical 
  examination 
  the 
  girdle 
  

   was 
  found 
  to 
  be 
  leathery 
  and 
  crinkled, 
  but 
  quite 
  devoid 
  of 
  hairs. 
  

   Reference 
  showed 
  that 
  a 
  section 
  of 
  Callochiton 
  had, 
  instead 
  of 
  a 
  scaly 
  

   girdle, 
  one 
  with 
  hairs; 
  that 
  was, 
  differing 
  in 
  no 
  way 
  from 
  Eudoxo- 
  

   chiton 
  save 
  in 
  the 
  nature 
  of 
  the 
  teeth. 
  A 
  member 
  of 
  that 
  section 
  is 
  

   inornatus, 
  Ten. 
  -Woods, 
  an 
  inhabitant 
  of 
  Tasmania; 
  this 
  is 
  a 
  shell 
  

   much 
  less 
  than 
  EudoxocMton, 
  but 
  still 
  larger 
  than 
  Callochiton 
  platcssa, 
  

   Gould. 
  Superfiicially 
  it 
  would 
  pass 
  for 
  a 
  small 
  EudoxocMton. 
  The 
  

   coincidence 
  of 
  size, 
  habitat, 
  and 
  facies 
  interested 
  me, 
  and 
  suggested 
  

   relationship 
  between 
  the 
  two 
  genera. 
  I 
  had 
  not 
  completed 
  my 
  studies 
  

   when 
  I 
  received 
  Dr. 
  Thiele's 
  work, 
  wherein 
  he 
  transfers 
  Eudoxochiton 
  

   to 
  his 
  sub-family 
  Callochitoninse. 
  His 
  reasons 
  for 
  so 
  doing 
  appear 
  

   sound, 
  and 
  in 
  this 
  disposition 
  I 
  would 
  concur. 
  In 
  the 
  present 
  state 
  

   of 
  our 
  knowledge 
  this 
  seems 
  more 
  suitable 
  than 
  the 
  position 
  selected 
  

   for 
  EudoxocMton 
  in 
  Pilsbry's 
  classification. 
  

  

  New 
  Zealand 
  Onithochitons. 
  

  

  Quoy 
  & 
  Gaimard 
  (Voy. 
  Astrolabe, 
  Zool., 
  vol. 
  iii, 
  p. 
  393, 
  pi. 
  Ixxv, 
  

   figs. 
  19-24, 
  1835) 
  described 
  CMton 
  imdulatus 
  as 
  a 
  smooth 
  shell. 
  

   Reeve 
  wrote 
  (Conch. 
  Icon., 
  pi. 
  xvi, 
  figs. 
  87-90, 
  sp. 
  87, 
  1847), 
  

   "lateral 
  areas 
  sometimes 
  obscurely 
  ridged." 
  Hutton's 
  description 
  

   (Man. 
  N.Z. 
  Moll., 
  p. 
  114, 
  1880) 
  reads, 
  "with 
  indistinct 
  radiating 
  

   moniliform 
  ridges. 
  

  

  In 
  the 
  Bull. 
  Soc. 
  Philom., 
  Paris, 
  1880-1, 
  p. 
  120, 
  Rochebrune 
  

   introduced 
  three 
  new 
  species, 
  and 
  the 
  following 
  year 
  in 
  the 
  same 
  

   Journal, 
  p. 
  190, 
  duplicated 
  one 
  of 
  these 
  by 
  giving 
  a 
  new 
  name 
  to 
  

   the 
  same 
  shell 
  as 
  he 
  had 
  previously 
  described. 
  These 
  four 
  names 
  

   obviously 
  refer 
  to 
  one 
  species, 
  which 
  is 
  as 
  certainly 
  Reeve's 
  imdulatus. 
  

  

  In 
  the 
  Man. 
  Couch., 
  vol. 
  xiv, 
  p. 
  247, 
  pi. 
  Iv, 
  figs. 
  10, 
  11, 
  Pilsbry 
  

   introduced 
  a 
  new 
  species 
  semisculptus, 
  of 
  unknown 
  habitat, 
  and 
  in 
  

   the 
  next 
  volume, 
  p. 
  106, 
  referred 
  to 
  Rochebrune's 
  four 
  species 
  as 
  

   unrecognizable. 
  In 
  1904 
  Wissel 
  recorded 
  semisculptus, 
  Pils., 
  from 
  

   the 
  Chatham 
  Islands, 
  and 
  added 
  a 
  new 
  species, 
  marmoratus, 
  to 
  the 
  

   New 
  Zealand 
  list. 
  Suter, 
  the 
  following 
  year 
  (Journ. 
  Malac, 
  

   vol. 
  xii, 
  p. 
  71, 
  1905) 
  reported 
  semisculptus 
  also 
  from 
  the 
  Chathams, 
  

   Wissel's 
  work 
  being 
  unknown 
  to 
  him. 
  Later, 
  Suter 
  (Proc. 
  Malac. 
  

   Soc, 
  vol. 
  vii, 
  p. 
  297, 
  1907) 
  introduced 
  a 
  new 
  species 
  nodosus, 
  and 
  

   then, 
  receiving 
  Wissel's 
  paper, 
  alleged 
  (Nachr. 
  deutsch. 
  malak. 
  Ges., 
  

   vol. 
  xli, 
  p. 
  75) 
  that 
  marmoratus 
  was 
  simply 
  a 
  colour 
  variant 
  of 
  

  

  