﻿112 
  PEOCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  The 
  descriptions 
  and 
  figures 
  tare 
  good. 
  

  

  When 
  Reeve 
  wrote 
  his 
  Monograph 
  he 
  doubtingly 
  made 
  the 
  latter 
  

   synonymous 
  with 
  the 
  former, 
  introducing 
  as 
  new 
  species 
  pi. 
  xvii, 
  

   sp. 
  104, 
  Chiton 
  metallmis, 
  Australia, 
  Mas. 
  Cuming, 
  and 
  pi. 
  xxi, 
  

   sp. 
  142, 
  Chiton 
  novcehollandice, 
  New 
  Holland, 
  Mus. 
  Brit. 
  Pilsbry 
  

   made 
  evanidus 
  and 
  metallicus 
  synonymous 
  with 
  australis, 
  writing 
  : 
  

   "The 
  synonymy 
  ... 
  is 
  unquestionable," 
  and 
  giving 
  as 
  habitat 
  

   " 
  Port 
  Jackson, 
  Australia 
  ". 
  /. 
  novcehollayidice 
  was 
  admitted 
  as 
  distinct 
  

   from 
  "Adelaide, 
  S. 
  Australia". 
  Shells 
  from 
  the 
  two 
  localities 
  

   named 
  (New 
  South 
  Wales 
  and 
  South 
  Australia) 
  are 
  very 
  distinct. 
  

   Recognition 
  of 
  two 
  forms 
  in 
  Tasmania 
  necessitated 
  re-investigation, 
  

   which 
  revealed 
  that 
  the 
  form 
  recorded 
  as 
  ^'■australis" 
  from 
  that 
  

   locality 
  had 
  little 
  to 
  do 
  with 
  the 
  typical 
  Sydney 
  shell. 
  The 
  

   description 
  of 
  evmiidus 
  gives 
  as 
  the 
  salient 
  features 
  "central 
  areas 
  

   smooth 
  in 
  the 
  middle, 
  faintly 
  striated 
  at 
  the 
  sides; 
  lateral 
  areas 
  

   rather 
  elevated, 
  with 
  radiating 
  granular 
  strice 
  ". 
  This 
  disagrees 
  with 
  

   australis, 
  but 
  describes 
  the 
  eastern 
  Tasmanian 
  shell 
  very 
  exactly. 
  

  

  The 
  north-west 
  Tasmanian 
  form 
  differs 
  in 
  the 
  absolute 
  smoothness 
  

   of 
  its 
  pleural 
  areas 
  and 
  seems 
  identical 
  with 
  the 
  South 
  Australian 
  

   shells 
  known 
  as 
  /. 
  novcehollandice 
  (Reeve). 
  It 
  is 
  easy 
  to 
  separate 
  

   these 
  when 
  series 
  are 
  compared, 
  but 
  individuals 
  are 
  not 
  so 
  clearly 
  

   differentiated, 
  and 
  we 
  are 
  not 
  certain 
  about 
  immature 
  shells, 
  the 
  

   north-west 
  form 
  being 
  apparently 
  moi'e 
  elevated. 
  However, 
  the 
  

   species 
  of 
  Ischnoradsia 
  seem 
  to 
  have 
  exceedingly 
  narrow 
  limits, 
  so 
  

   that 
  for 
  the 
  present 
  we 
  may 
  recognize 
  two 
  species 
  in 
  Tasmania. 
  We 
  

   make 
  this 
  observation 
  because 
  we 
  have 
  an 
  undescribed 
  species 
  from 
  

   Caloundra, 
  Queensland, 
  which 
  is 
  exceedinglj' 
  like 
  evanida, 
  though 
  

   the 
  very 
  different 
  australis 
  intervenes 
  geographically. 
  

  

  17. 
  LoEicA. 
  ciMOLiA 
  (Recvc). 
  

  

  In 
  the 
  Conch. 
  Icon. 
  Chiton, 
  pi. 
  vi, 
  sp. 
  31, 
  fig. 
  31, 
  February, 
  

   1847, 
  Reeve 
  figured 
  and 
  described 
  Chiton 
  volvox 
  from 
  specimens 
  in 
  

   the 
  Mus. 
  Cuming, 
  collected 
  at 
  Sydney, 
  New 
  Holland, 
  by 
  Jukes. 
  

   Later 
  in 
  the 
  same 
  work 
  (pi. 
  xxi, 
  sp. 
  141, 
  fig. 
  141, 
  May, 
  1847) 
  

   Reeve 
  added 
  Chiton 
  cimolius 
  from 
  the 
  same 
  collection, 
  the 
  only 
  

   locality 
  given 
  being 
  Australia: 
  he 
  observed, 
  "Allied 
  in 
  form, 
  but 
  

   not 
  in 
  sculpture, 
  to 
  the 
  C. 
  volvox 
  ; 
  at 
  a 
  loss 
  for 
  a 
  name, 
  I 
  have 
  

   distinguished 
  its 
  resemblance 
  in 
  colour 
  to 
  the 
  common 
  fuller's 
  clay." 
  

   The 
  differences 
  are 
  not 
  clearly 
  defined 
  in 
  the 
  descriptions, 
  but 
  we 
  

   note 
  with 
  regard 
  to 
  the 
  former 
  "ridges 
  narrow, 
  slightly 
  waved, 
  

   interstices 
  peculiarly 
  crenulately 
  latticed", 
  and 
  to 
  the 
  latter 
  " 
  central 
  

   ai'eas 
  smooth 
  in 
  the 
  middle, 
  ridged 
  on 
  each 
  side, 
  ridges 
  thin, 
  scarcely 
  

   granulated, 
  interstices 
  hollowed". 
  

  

  In 
  1871 
  Angas, 
  recording 
  Lorica 
  angasi 
  from 
  Port 
  Jackson, 
  

   commented 
  (Proc. 
  Zool. 
  Soc. 
  London, 
  1871, 
  p. 
  97), 
  "A 
  species 
  quite 
  

   distinct 
  from 
  L. 
  cimolia, 
  Reeve, 
  of 
  which 
  L. 
  volvox, 
  Reeve, 
  is 
  a 
  

   synonym." 
  

  

  In 
  the 
  Man. 
  Conch., 
  vol. 
  xiv, 
  p. 
  237, 
  1893, 
  Pilsbry 
  accepted 
  

   this 
  synonymy, 
  probably 
  following 
  Haddon 
  (Rep. 
  Zool. 
  Res. 
  

   Challenger, 
  vol. 
  xv, 
  Polyp., 
  p. 
  31, 
  1886), 
  writing, 
  "The 
  differences 
  

  

  