﻿100 
  PKOCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  Hal. 
  — 
  South 
  Australia. 
  

  

  Type 
  in 
  British 
  Museum. 
  

  

  From 
  the 
  very 
  short 
  insertion 
  plates 
  it 
  was 
  easily 
  deduced 
  that 
  it 
  

   lived 
  in 
  sheltered 
  places. 
  Bednall, 
  at 
  the 
  above 
  reference, 
  writes 
  — 
  

   "Occurs 
  in 
  company 
  with 
  the 
  Ischnochitons 
  under 
  blocks 
  of 
  stone 
  in 
  

   comparatively 
  smooth 
  water," 
  and 
  gives 
  as 
  localities 
  — 
  "North 
  Arm, 
  

   Port 
  Adelaide 
  on 
  Pinna 
  (Bednall) 
  : 
  Sultana 
  Bay, 
  Yorke 
  Peninsula, 
  

   S.A. 
  (Matthews 
  & 
  Bednall)." 
  

  

  This 
  most 
  interesting 
  shell 
  is 
  by 
  the 
  peculiar 
  characters 
  of 
  the 
  

   tail-valve, 
  which 
  I 
  have 
  endeavoured 
  to 
  denote, 
  nearest 
  egregia, 
  

   H. 
  Ad. 
  That 
  species 
  is 
  the 
  type 
  of 
  Adams' 
  genus 
  Fremhlya, 
  and 
  

   I 
  should 
  also 
  so 
  place 
  this 
  shell. 
  Pilsbry 
  reduced 
  this 
  to 
  sectional 
  

   rank, 
  but 
  Thiele 
  has 
  reinstated 
  it 
  as 
  a 
  full 
  genus, 
  so 
  it 
  will 
  be 
  very 
  

   interesting 
  to 
  see 
  whether 
  this 
  shell 
  will 
  bear 
  out 
  Thiele's 
  conclusions. 
  

   I 
  have 
  no 
  spirit 
  specimens. 
  It 
  stands 
  quite 
  apart 
  from, 
  the 
  other 
  

   Australian 
  corrugated 
  Plaxiphora. 
  

  

  Plaxiphoba 
  excuevata, 
  Pilsbrj". 
  

   Plaxiphora 
  excurvata, 
  Pilsbry, 
  Man. 
  Conch., 
  vol. 
  xiv, 
  p. 
  327. 
  

  

  This 
  species, 
  described 
  from 
  Carpenter's 
  MSS., 
  is 
  unfigured, 
  and 
  to 
  

   me 
  quite 
  indeterminable. 
  It 
  is 
  quoted 
  — 
  "This 
  shell 
  has 
  a 
  general 
  

   external 
  resemblance 
  in 
  size 
  and 
  shape 
  to 
  P. 
  cuprea,^^ 
  but 
  is 
  stated 
  

   to 
  be 
  70 
  mm. 
  long 
  by 
  39 
  broad. 
  The 
  largest 
  specimen 
  of 
  P. 
  cuprea, 
  

   so 
  named 
  by 
  Carpenter 
  himself, 
  is 
  only 
  53 
  mm. 
  by 
  34 
  mm., 
  so 
  that 
  

   some 
  error 
  has 
  crept 
  in. 
  The 
  angle 
  of 
  divergence 
  would 
  also 
  indicate 
  

   a 
  much 
  higher 
  shell 
  than 
  is 
  usually 
  met 
  with 
  among 
  Australian 
  

   Plaxiphora. 
  

  

  Until 
  the 
  type 
  is 
  re-examined 
  it 
  seems 
  that 
  this 
  species 
  must 
  be 
  

   ignored, 
  as 
  the 
  name 
  cannot 
  possibly 
  be 
  allotted 
  to 
  either 
  of 
  the 
  

   preceding 
  four 
  Australian 
  species. 
  

  

  Spongiochiton 
  pkodtjctds, 
  Pilsbry. 
  

   Spongiochiton 
  productus 
  (Cpr.), 
  Pilsbrj% 
  Man. 
  Conch., 
  vol. 
  xiv, 
  p. 
  26 
  ; 
  

  

  vol. 
  XV, 
  p. 
  7. 
  

  

  Acanthochites 
  Carpenteri, 
  Pilsbrjr, 
  loc. 
  cit., 
  vol. 
  xv, 
  p. 
  35, 
  pi. 
  i, 
  

   figs. 
  14-22. 
  

  

  A 
  shell 
  supposed 
  to 
  be 
  from 
  New 
  Zealand 
  was 
  named 
  in 
  MS. 
  by 
  

   Carpenter 
  as 
  Spongiochiton 
  productus, 
  new 
  genus 
  and 
  new 
  species. 
  

   Though 
  twice 
  noticed 
  previously 
  in 
  literature, 
  the 
  species 
  was 
  never 
  

   published 
  until 
  Pilsbry 
  took 
  it 
  up 
  in 
  1892. 
  "With 
  Carpenter's 
  good 
  

   manuscript 
  description 
  there 
  were 
  no 
  figures. 
  

  

  Later 
  Pilsbry 
  came 
  upon 
  some 
  drawings 
  of 
  a 
  shell 
  made 
  under 
  the 
  

   direction 
  of 
  Carpenter. 
  These 
  were 
  unnamed, 
  localized 
  as 
  "Port 
  

   Elizabeth, 
  South 
  Africa", 
  and 
  as 
  the 
  measurements 
  given 
  differed 
  

   Pilsbry 
  described 
  them 
  as 
  Acanthochites 
  Carpenteri, 
  allotted 
  them 
  to 
  

   the 
  section 
  Notoplax, 
  but 
  recognized 
  their 
  similarity 
  to 
  productus, 
  as 
  

   he 
  wrote 
  — 
  "Compare 
  Spot^giochiton 
  productus.'''' 
  This 
  latter 
  is 
  quite 
  

   unknown 
  to 
  New 
  Zealand 
  students, 
  and 
  the 
  former 
  to 
  South 
  

   African 
  ones. 
  

  

  