﻿lEEDALE 
  : 
  ]SrOTES 
  ON 
  POLYPLACOPHORA. 
  95 
  

  

  stoutness 
  of 
  the 
  valves 
  and 
  the 
  length 
  of 
  the 
  insertion 
  plates 
  it 
  can 
  

   be 
  recognized 
  as 
  living 
  well 
  out 
  in 
  the 
  breakers, 
  occupying 
  more 
  

   exposed 
  situations 
  than 
  the 
  smooth 
  shell 
  Camphelli, 
  Filhol, 
  which 
  

   usually 
  accompanies 
  it 
  on 
  the 
  coasts 
  of 
  New 
  Zealand. 
  

  

  Plaxiphora 
  Campbelli, 
  Filhol. 
  

  

  Plaxifora 
  Camphelli, 
  Filhol, 
  Compt. 
  Rend., 
  1880, 
  vol. 
  xci, 
  p. 
  1095. 
  

   Flaxipliora 
  Camphelli, 
  Filhol: 
  Pilsbry, 
  Man. 
  Conch., 
  1893, 
  ser. 
  i, 
  

  

  vol. 
  XV, 
  p. 
  107. 
  

   P. 
  superha 
  (Pils.): 
  Suter, 
  Proc. 
  Malae. 
  Soc, 
  1897, 
  vol. 
  ii, 
  p. 
  188. 
  

   P. 
  suhatrata, 
  Pils.: 
  Suter, 
  loo. 
  cit., 
  p. 
  190. 
  

  

  Under 
  Plaxiphora 
  biramosa, 
  Q. 
  & 
  G., 
  Thiele 
  (Zool. 
  Chun, 
  1909, 
  

   Heft 
  Ivi, 
  p. 
  27) 
  also 
  works 
  out 
  this 
  synonymy, 
  and 
  gives 
  figures 
  of 
  

   the 
  fifth 
  and 
  eighth 
  valves 
  of 
  this 
  species 
  (pi. 
  iii, 
  figs. 
  39, 
  40). 
  This 
  

   is 
  the 
  only 
  species 
  of 
  Plaxiphora 
  I 
  have 
  seen 
  from 
  the 
  Auckland 
  and 
  

   Campbell 
  Islands, 
  where 
  it 
  appears 
  to 
  be 
  veiy 
  abundant. 
  It 
  extends 
  

   all 
  over 
  jS'ew 
  Zealand, 
  where, 
  however, 
  it 
  is 
  a 
  rare 
  shell. 
  

  

  Plaxiphora 
  Fkemblyi 
  (Broderip). 
  

  

  Chiton 
  Fremhleii, 
  Brofl., 
  P.Z.S., 
  1832, 
  p. 
  28. 
  

  

  C. 
  setiger, 
  var. 
  Fremhlii, 
  Brod. 
  : 
  Sowerby, 
  Conch. 
  111., 
  1833, 
  p. 
  7, 
  fig. 
  4. 
  

   C 
  setiger, 
  var. 
  /3, 
  Reeve, 
  Conch. 
  Icon., 
  1847, 
  pi. 
  ix, 
  fig. 
  48 
  J. 
  

   Plaxiphora 
  setiger, 
  var. 
  Fremhliji, 
  Brod. 
  : 
  Pilsbry, 
  Man. 
  Conch., 
  1893, 
  

  

  vol. 
  xiv, 
  p. 
  318. 
  

   Chiton 
  Fremhlyi, 
  Brod. 
  : 
  Clessin, 
  Conch. 
  Cab., 
  1904, 
  Heft 
  xvii, 
  p. 
  117, 
  

  

  pi. 
  xli, 
  fig. 
  6. 
  

   Plaxipliora 
  Fremhlyi, 
  Brod. 
  : 
  Thiele, 
  Zool. 
  Chun, 
  1909, 
  Heft 
  Ivi, 
  p. 
  23, 
  

  

  pi. 
  iii, 
  figs. 
  12-14. 
  

  

  This 
  species 
  has 
  been, 
  owing 
  to 
  its 
  rarity, 
  deprived 
  of 
  its 
  due 
  until 
  

   this 
  year. 
  Dr. 
  Thiele 
  anticipated 
  me 
  in 
  restoring 
  it 
  to 
  the 
  place 
  it 
  

   deserves, 
  and 
  has 
  given 
  figures 
  of 
  the 
  fifth 
  and 
  eighth 
  valves 
  of 
  one 
  of 
  

   the 
  type 
  lot. 
  Unfortunately 
  the 
  figure 
  does 
  not 
  show 
  the 
  sculpture, 
  

   and 
  it 
  is 
  quoted 
  as 
  P. 
  setiger, 
  var. 
  Fremhlii, 
  Brod., 
  by 
  Ball 
  (Proc. 
  U.S. 
  

   Nat. 
  Mus., 
  1909, 
  vol. 
  xxxvii, 
  p. 
  246) 
  immediately 
  after 
  he 
  had 
  received 
  

   Thiele' 
  s 
  paper. 
  

  

  It 
  is 
  quite 
  unlike 
  ' 
  setiger 
  ', 
  being 
  a 
  South 
  American 
  representative 
  

   of 
  the 
  Australian 
  corrugated 
  Plaxiphora, 
  having 
  exactly 
  the 
  same 
  

   coloration 
  as 
  is 
  there 
  commonly 
  met 
  with. 
  

  

  The 
  girdle 
  is 
  very 
  wide, 
  thin, 
  horny, 
  and 
  sparsely 
  scattered 
  over 
  

   with 
  hairs 
  not 
  at 
  all 
  like 
  the 
  girdle 
  of 
  '■setiger'. 
  The 
  head-valve 
  is 
  

   eight-ribbed 
  and 
  concentrically 
  closely 
  sulctilate. 
  

  

  In 
  the 
  median 
  valves 
  the 
  lateral 
  areas 
  are 
  defined 
  by 
  an 
  indistinct 
  

   raised 
  rib, 
  and 
  are 
  closely 
  longitudinally 
  lorinldy 
  sulculate, 
  the 
  central 
  

   areas 
  are 
  smooth, 
  and 
  the 
  sides 
  of 
  the 
  pleura 
  are 
  %ig%agly 
  sculptured 
  from 
  

   the 
  lateral 
  rib. 
  This 
  sculpture 
  is 
  Avell 
  marked, 
  and 
  nothing 
  like 
  it 
  is 
  

   shown 
  in 
  the 
  many 
  .specimens 
  of 
  '■setiger'' 
  I 
  have 
  examined. 
  Moreover, 
  

   the 
  valves 
  are 
  rounded, 
  whereas 
  every 
  ' 
  setiger 
  ' 
  is 
  very 
  distinctly 
  

   keeled. 
  

  

  