﻿IKEDALK 
  & 
  may: 
  MISJfAMKD 
  TASMANIAX 
  CHITONS. 
  113 
  

  

  between 
  L. 
  volcox 
  and 
  Z. 
  cimolia 
  are 
  easily 
  effaced 
  when 
  a 
  good 
  

   series 
  is 
  exaniiued." 
  He 
  also 
  suggested 
  Chiton 
  riidis, 
  Hiitton, 
  as 
  a 
  

   synonym. 
  Hutton's 
  species 
  was 
  based 
  on 
  a 
  specimen 
  in 
  the 
  Colonial 
  

   Museum, 
  Wellington, 
  New 
  Zealand, 
  supposed 
  to 
  have 
  been 
  collected 
  

   in 
  that 
  country. 
  This 
  determination 
  has 
  been 
  accepted 
  by 
  all 
  workers 
  

   since, 
  Bednall, 
  Suter, 
  Torr, 
  Thiele, 
  and 
  ourselves 
  all 
  passing 
  this 
  

   synonymy 
  without 
  question. 
  

  

  The 
  consideration 
  of 
  the 
  present 
  collection 
  necessitated 
  a 
  review^, 
  

   and 
  with 
  the 
  types 
  of 
  Keeve's 
  species, 
  topotypes 
  of 
  the 
  first-named 
  

   species, 
  South 
  Australian 
  specimens, 
  and 
  shells 
  purporting 
  to 
  have 
  

   been 
  collected 
  in 
  New 
  Zealand 
  we 
  find 
  that 
  Lorica 
  cimolia, 
  lleeve, 
  is 
  

   the 
  name 
  for 
  the 
  Tasmanian 
  species, 
  which 
  differs 
  at 
  sight 
  from 
  the 
  

   New 
  South 
  Wales 
  shell 
  in 
  lacking 
  the 
  very 
  distinct 
  latticing 
  between 
  

   the 
  longitudinal 
  ribs 
  of 
  the 
  central 
  areas. 
  The 
  ribs 
  are 
  more 
  distant 
  

   and 
  not 
  so 
  definite 
  ; 
  the 
  girdle-scales 
  differ 
  in 
  size, 
  and 
  there 
  are 
  

   other 
  minor 
  differences. 
  Basset 
  Hull 
  (Proc. 
  Linn. 
  Soc. 
  N. 
  S.Wales, 
  

   vol. 
  XXXV, 
  1910, 
  pi. 
  xvii, 
  figs. 
  1, 
  2) 
  gave 
  illustrations 
  of 
  half-valves 
  

   of 
  the 
  fossil 
  Lorica 
  duuiana, 
  n.sp., 
  and 
  the 
  recent 
  L. 
  volvox, 
  

   lleeve. 
  llelying 
  on 
  the 
  excellent 
  illustrations, 
  we 
  cannot 
  separate 
  

   the 
  recent 
  Tasniunian 
  and 
  South 
  Australian 
  species 
  from 
  the 
  fossil 
  

   L. 
  dimiajia, 
  Avhich 
  would 
  thus 
  become 
  a 
  synonym 
  of 
  Z. 
  cimolia, 
  

   lleeve. 
  It 
  may 
  be 
  possible 
  later 
  on 
  to 
  differentiate 
  southern 
  

   Tasmanian 
  from 
  South 
  Australian 
  shells, 
  but 
  typical 
  Z. 
  volvox 
  cannot 
  

   be 
  confused 
  with 
  either. 
  The 
  juveniles 
  of 
  the 
  two 
  species 
  also 
  show 
  

   striking 
  differences 
  in 
  many 
  respects. 
  

  

  Lorica 
  was 
  reduced 
  by 
  Thiele 
  to 
  subgeneric 
  rank 
  under 
  C 
  all 
  isto 
  chiton, 
  

   Loricella 
  and 
  Squamophora 
  being 
  given 
  similar 
  rank. 
  Thiele 
  over- 
  

   looked 
  the 
  fact 
  that 
  Lorica 
  had 
  priority, 
  and 
  that 
  Callistochiton 
  would 
  

   be 
  the 
  name 
  to 
  suffer. 
  We 
  cannot 
  see, 
  however, 
  that 
  there 
  is 
  such 
  

   ti 
  close 
  relationship, 
  and 
  maintain 
  all 
  the 
  groups 
  with 
  generic 
  value 
  

   and 
  suggest 
  later 
  that 
  they 
  will 
  not 
  be 
  closely 
  associated. 
  

   Squamophora 
  seems 
  very 
  near 
  to 
  Loricella, 
  but 
  when 
  the 
  juveniles 
  of 
  

   Lorica, 
  Loricella, 
  and 
  Callistochiton 
  are 
  compared 
  little 
  resemblance 
  

   is 
  found. 
  With 
  regard 
  to 
  the 
  genus 
  Callistochiton, 
  we 
  would 
  note 
  it 
  

   has 
  been 
  badly 
  handled 
  in 
  Australia. 
  The 
  generic 
  (or 
  family) 
  

   characters 
  have 
  been 
  taken 
  as 
  specific, 
  and 
  hence 
  Torr 
  recorded 
  that 
  

   he 
  had 
  traced 
  C. 
  antiquus 
  from 
  Queensland 
  to 
  West 
  Australia. 
  The 
  

   northern 
  Queensland 
  shell 
  differs 
  from 
  the 
  Sydney 
  one, 
  which 
  is 
  

   •easily 
  separable 
  from 
  the 
  South 
  Australian 
  form, 
  Avhich, 
  however, 
  

   may 
  be 
  the 
  one 
  inhabiting 
  Bass' 
  Straits, 
  and 
  may 
  range 
  to 
  south- 
  

   west 
  Australia. 
  The 
  southern 
  Tasmanian 
  shell 
  is, 
  however, 
  so 
  very 
  

   different 
  that 
  we 
  are 
  dubious 
  of 
  every 
  recoi'd 
  we 
  have 
  not 
  personally 
  

   investigated 
  ; 
  and 
  we 
  note 
  variation 
  among 
  unlocalized 
  South 
  

   Australian 
  examples. 
  

  

  18. 
  Callistochiton 
  mawlri, 
  n.sp. 
  PI. 
  IV, 
  Fig. 
  5. 
  

  

  Shell 
  small, 
  elliptic 
  oblong, 
  elevated, 
  keeled, 
  side 
  slopes 
  curved, 
  

   valves 
  not 
  beaked. 
  Colour 
  orange-brown 
  with 
  distant 
  dark-brown 
  

   spots; 
  girdle 
  orange-brown 
  tessellated 
  with 
  dark-brown 
  stripes. 
  

   Anterior 
  valve 
  with 
  twelve 
  distinct 
  rounded 
  radial 
  ribs 
  with 
  deep 
  

  

  