﻿iiiEDAi.io 
  & 
  may: 
  misxamed 
  tasmanian 
  chitons. 
  Ill 
  

  

  corresponds 
  to 
  this 
  species". 
  Bednall 
  (Proc. 
  Malac. 
  Soc, 
  vol. 
  ii, 
  

   April, 
  1897, 
  p. 
  144) 
  then 
  recorded 
  a 
  species 
  under 
  this 
  name, 
  giving 
  

   a 
  very 
  fine 
  word-picture 
  of 
  the 
  shell, 
  and 
  observing, 
  " 
  liecorded 
  by 
  

   him 
  [Angas] 
  from 
  New 
  South 
  Wales, 
  where 
  it 
  does 
  not 
  appear 
  

   to 
  occur. 
  I 
  have 
  received 
  specimens 
  of 
  /. 
  divergens 
  { 
  — 
  proieus) 
  under 
  

   this 
  name." 
  Bednall's 
  species 
  does 
  not 
  agree 
  with 
  the 
  type 
  of 
  

   lleeve's 
  species, 
  but 
  is 
  a 
  very 
  distinct 
  unnamed 
  shell. 
  We 
  would 
  notu 
  

   that 
  Sykes 
  (Proc. 
  Malac. 
  8oc., 
  vol. 
  ii, 
  July, 
  1896, 
  p. 
  88) 
  also 
  recorded 
  

   Jscfifiochiton 
  tistulatus 
  (Reeve) 
  from 
  Port 
  Pliillip. 
  We 
  have 
  not 
  seen 
  

   the 
  shells 
  so 
  named, 
  but 
  they 
  may 
  have 
  been 
  the 
  true 
  ustulatus, 
  since 
  

   there 
  are 
  shells 
  in 
  the 
  British 
  Museum 
  dredged 
  in 
  Port 
  Phillip 
  which 
  

   agree 
  very 
  closely 
  with 
  tlie 
  type 
  lot 
  of 
  usltdatus, 
  Reeve. 
  

  

  15. 
  IscHNOCHiTON 
  Touiii, 
  n.sp. 
  PL 
  V, 
  Fig. 
  3. 
  

  

  Ischnochiton 
  usiulatus, 
  PiLsbry, 
  Proc. 
  Acad. 
  jS'at. 
  Sci. 
  Philad., 
  1894, 
  

   p. 
  70, 
  footnote, 
  and 
  of 
  Bednall, 
  Torr, 
  May, 
  and 
  Thiele, 
  but 
  not 
  

   C'hitoti 
  ustulatus, 
  lleeve. 
  

  

  Shell 
  of 
  full 
  size, 
  for 
  the 
  genus 
  narrowly 
  elongate, 
  girdle 
  broad, 
  

   elevated, 
  round-backed, 
  valves 
  not 
  beaked. 
  Colour 
  red 
  brown, 
  

   longitudinally 
  striped 
  with 
  cream, 
  stripes 
  more 
  prominent 
  oir 
  the 
  

   dorsal 
  area, 
  lacking 
  on 
  head-valve. 
  Anterior 
  valve 
  very 
  finely 
  

   radially 
  ribbed, 
  about 
  fifty 
  being 
  counted 
  on 
  normal 
  specimen. 
  

   Median 
  valves, 
  with 
  lateral 
  areas 
  strongly 
  elevated, 
  similarly 
  

   sculptured, 
  but 
  sculpture 
  commonly 
  tending 
  to 
  elongate 
  lozenge 
  

   shapes 
  through 
  growtli-lines. 
  Pleural 
  areas 
  very 
  finely 
  (luincuiicially 
  

   punctate, 
  somewhat 
  linear 
  towards 
  edges, 
  even 
  fine 
  on 
  the 
  jugum. 
  

   Tail-valve 
  with 
  raucro 
  elevate, 
  ante-central, 
  posterior 
  slope 
  a 
  little 
  

   concave; 
  the 
  posterior 
  sculpture 
  like 
  that 
  of 
  anterior 
  valve, 
  but 
  

   much 
  more 
  cut 
  into 
  lozenges 
  by 
  the 
  concentric 
  growth-lines. 
  

   Internal 
  features 
  normal. 
  Girdle 
  very 
  broad, 
  covered 
  with 
  microscopic 
  

   scales, 
  not 
  distinguishable 
  with 
  an 
  ordinary 
  lens. 
  This 
  is 
  diagnostic. 
  

   Under 
  the 
  microscope 
  the 
  scales 
  are 
  seen 
  to 
  be 
  elongate 
  ovals, 
  a 
  little 
  

   variable 
  in 
  size, 
  flattened, 
  and 
  closely 
  imbricating; 
  they 
  average 
  

   about 
  a 
  tenth 
  of 
  a 
  millimetre 
  long, 
  and 
  are 
  finely 
  striated 
  with 
  about 
  

   twelve 
  strise. 
  

  

  Type 
  from 
  Barren 
  Island, 
  Flinders 
  Group, 
  collected 
  by 
  W. 
  L. 
  May. 
  

   Length 
  29, 
  breadth 
  14 
  mm. 
  

  

  Range: 
  Adelaidean 
  region 
  from 
  Flinders 
  Group 
  to 
  West 
  Australia, 
  

   recorded 
  bj^ 
  Torr 
  and 
  Thiele. 
  

  

  This 
  very 
  distinct 
  species 
  stands 
  quite 
  alone, 
  not 
  only 
  in 
  shape, 
  

   coloration, 
  and 
  sculpture, 
  but 
  in 
  its 
  microscopic 
  girdle-scales. 
  We 
  

   have 
  given 
  a 
  section 
  of 
  the 
  girdle 
  of 
  one 
  of 
  the 
  type 
  series 
  of 
  Chiton 
  

   iistulattis, 
  Reeve, 
  for 
  comparison, 
  drawn 
  from 
  the 
  specimens 
  in 
  the 
  

   British 
  Museum 
  (PI. 
  Y, 
  Fig. 
  3«"). 
  We 
  have 
  not 
  yet 
  recognized 
  

   Reeve's 
  species, 
  though 
  it 
  certainly 
  seems 
  Australian. 
  

  

  16. 
  IsCHNORADSIA 
  EVANIDA 
  (SoWCrby). 
  

  

  In 
  the 
  "Mag. 
  Nat. 
  Hist. 
  (Charlesworth) 
  ", 
  vol. 
  iv, 
  June. 
  1840, 
  

   Sowerby 
  described 
  (p. 
  290) 
  Chiton 
  amtralis 
  (Conch. 
  Illus., 
  fig. 
  46), 
  

   Australia, 
  and 
  (p. 
  291) 
  Chiton 
  evanidus 
  (Conch. 
  Illus., 
  fig. 
  139), 
  New 
  

   Holland. 
  

  

  