﻿104 
  PROCEKDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIEXY. 
  

  

  the 
  description 
  the 
  tail-valve 
  was 
  noted, 
  as 
  follows 
  : 
  Tail-plate 
  much 
  

   thicker 
  within 
  along 
  the 
  posterior 
  edge, 
  -which 
  is 
  roughened 
  by 
  fine 
  

   cross 
  striae, 
  there 
  being 
  no 
  prominent 
  teeth 
  and, 
  of 
  course, 
  no 
  notches. 
  

  

  Dr. 
  Torr 
  collected 
  specimens 
  at 
  the 
  type 
  locality, 
  and 
  they 
  were 
  

   described 
  as 
  Enoplochiion 
  Torri 
  by 
  Bastow 
  & 
  Gatlitf 
  . 
  I 
  have 
  examined 
  

   a 
  syntype 
  of 
  this 
  species, 
  as 
  well 
  as 
  the 
  types 
  of 
  Smith's 
  species, 
  and 
  

   of 
  the 
  identity 
  of 
  these 
  two 
  there 
  is 
  no 
  doubt. 
  

  

  Sclerochiton 
  miles, 
  Pilsbry, 
  was 
  closely 
  allied, 
  but 
  seemed 
  generically 
  

   separable 
  by 
  the 
  presence 
  of 
  a 
  toothed 
  insertion 
  plate 
  in 
  the 
  tail-valve. 
  

   Dr. 
  Thiele 
  has, 
  however, 
  referred 
  Curtisianus, 
  Smith, 
  to 
  Sclerochiton, 
  

   and 
  figured 
  this 
  species 
  as 
  having 
  the 
  tail-valve, 
  with 
  a 
  slit 
  insertion 
  

   plate. 
  Moreover, 
  he 
  gave 
  good 
  figures 
  of 
  a 
  new 
  species, 
  Aruensis, 
  

   from 
  the 
  Aru 
  Islands, 
  which, 
  from 
  a 
  series 
  of 
  Curtisianus 
  I 
  myself 
  

   collected 
  at 
  the 
  type 
  locality, 
  was 
  easily 
  recognized 
  as 
  simply 
  a 
  young, 
  

   well-sculptured 
  shell 
  of 
  that 
  species. 
  He 
  figured 
  the 
  insertion 
  plate 
  

   of 
  the 
  tail-valve 
  as 
  toothed 
  for 
  that 
  species 
  also. 
  

  

  E,e-examination 
  of 
  the 
  types 
  of 
  that 
  species 
  confirmed 
  Smith's 
  

   description, 
  so 
  I 
  thereupon 
  dissected 
  some 
  of 
  my 
  own 
  shells, 
  with 
  the 
  

   result 
  that 
  teeth 
  were 
  easily 
  discernible, 
  as 
  in 
  Thiele's 
  specimens. 
  

   I 
  conclude 
  that 
  the 
  method 
  of 
  dissection 
  may 
  have 
  had 
  something 
  to 
  

   do 
  with 
  the 
  apparent 
  lack 
  in 
  the 
  types. 
  I 
  accordingly 
  confirm 
  Thiele's 
  

   disposition, 
  and 
  add 
  that 
  specimens 
  are 
  present 
  in 
  the 
  British 
  Museum 
  

   from 
  Thursday 
  Island. 
  Bastow 
  & 
  Gatliff's 
  reference 
  of 
  the 
  species 
  to 
  

   Enoplochiion 
  needs 
  no 
  consideration, 
  as 
  the 
  type 
  of 
  that 
  genus 
  differs 
  

   in 
  every 
  essential 
  feature. 
  

  

  Hedley 
  & 
  Hull 
  (Rec. 
  Aust. 
  Mus., 
  1909, 
  vol. 
  vii, 
  p. 
  265) 
  have 
  noted 
  

   that 
  Torri, 
  Bastow 
  & 
  GatlifP, 
  is 
  a 
  synonym 
  of 
  Curtisiana, 
  Smith, 
  but 
  

   misled, 
  as 
  I 
  was, 
  by 
  the 
  described 
  character 
  of 
  the 
  tail-plate, 
  have 
  

   transferred 
  it 
  to 
  Liolophtira. 
  Re-examination 
  of 
  fresh 
  specimens 
  will 
  

   certainly 
  enable 
  them 
  to 
  confirm 
  its 
  present 
  generic 
  disposition. 
  

   Pilsbry 
  reduced 
  Sclerochiton 
  to 
  sectional 
  rank 
  under 
  Chiton, 
  but 
  from 
  

   examination 
  of 
  the 
  type 
  of 
  this 
  species 
  and 
  a 
  Ceylon 
  species 
  I 
  agree 
  

   with 
  Thiele 
  in 
  separating 
  it 
  as 
  a 
  valid 
  genus. 
  

  

  Onithochiton 
  quercinus 
  (Gould). 
  

  

  Chiton 
  quercinus, 
  Gould, 
  Proc. 
  Bost. 
  Soc. 
  Nat. 
  Hist., 
  1846, 
  vol. 
  ii, 
  

  

  p. 
  142; 
  U.S. 
  Expl. 
  Exped. 
  Moll., 
  p. 
  312, 
  figs. 
  437, 
  437« 
  ; 
  Otia 
  

  

  Conch., 
  p. 
  3. 
  

   C. 
  {Onithochiton) 
  quercinus, 
  Gould, 
  Otia 
  Conch., 
  p. 
  242. 
  

   C. 
  Incii, 
  Reeve, 
  Conch. 
  Icon., 
  1847, 
  ISTo. 
  94, 
  pi. 
  xvi, 
  fig. 
  96, 
  det. 
  

  

  fig. 
  94. 
  

   Onithochiton 
  rugulosus, 
  Angas, 
  P.Z.S., 
  1867, 
  pp. 
  115, 
  223, 
  pi. 
  xiii, 
  

  

  fig. 
  29. 
  

   0. 
  Incei, 
  Angas, 
  P.Z.S., 
  1867, 
  p. 
  223. 
  

  

  0. 
  Lyellii 
  {non 
  Sow.), 
  Pilsbry, 
  Man. 
  Conch., 
  vol. 
  xiv, 
  p. 
  248 
  [pars). 
  

   0. 
  quercinus, 
  Gould 
  : 
  Pilsbry, 
  loc. 
  cit., 
  p. 
  248, 
  pi. 
  Iv, 
  figs. 
  12, 
  13. 
  

   0. 
  rugulosus, 
  Angas: 
  Pilsbry, 
  loc. 
  cit., 
  p. 
  294, 
  pi. 
  Iv, 
  fig. 
  19; 
  Proc. 
  

  

  Acad. 
  Nat. 
  Soc. 
  Phil., 
  1894, 
  p. 
  88. 
  

   0. 
  Incii, 
  Reeve 
  : 
  Thiele, 
  Zoologica 
  Chun, 
  Heft 
  Ivi, 
  p. 
  99, 
  pi. 
  x, 
  

  

  figs. 
  62, 
  63. 
  

  

  