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  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  Zealand, 
  the 
  Kerraadecs, 
  Lord 
  Howe 
  Island, 
  Norfolk 
  Island, 
  New- 
  

   Caledonia, 
  Sydney 
  Harbour, 
  New 
  South 
  Wales, 
  north 
  coast 
  of 
  

   Tasmania, 
  and 
  Port 
  Lincoln, 
  South 
  Australia, 
  in 
  fact 
  every 
  austral 
  

   locality 
  from 
  whicli 
  I 
  have 
  received 
  a 
  parcel 
  of 
  fine 
  shell-sand 
  or 
  

   fine 
  dredgings. 
  Commonly 
  live 
  shells 
  have 
  been 
  secured 
  when 
  live 
  

   sand 
  was 
  received. 
  All 
  the 
  species 
  are 
  very 
  minute, 
  and 
  I 
  have 
  

   about 
  a 
  dozen 
  distinct 
  species, 
  divisible 
  into 
  two 
  groups, 
  and 
  I 
  hope 
  

   later 
  to 
  thoroughly 
  elaborate 
  the 
  family 
  with 
  good 
  figures. 
  

  

  Megathura, 
  Pilsbry, 
  vice 
  Macrochasma, 
  Dall. 
  

  

  In 
  the 
  Proc. 
  U.S. 
  Nat. 
  Mas., 
  vol. 
  xlviii, 
  January 
  19, 
  1915, 
  

   Dr. 
  Dall 
  proposed 
  Macrochasma 
  as 
  a 
  new 
  generic 
  name 
  (p. 
  439) 
  for 
  

   Fissurella 
  crenulata, 
  Sowerby, 
  a 
  Pacific 
  coast 
  American 
  shell. 
  

   Recently 
  dealing 
  with 
  other 
  Fissurellids, 
  I 
  noted 
  that 
  Pilsbry 
  in 
  

   the 
  Man. 
  Conch., 
  vol. 
  xii, 
  1891, 
  p. 
  182, 
  quoted 
  in 
  the 
  synonymy 
  

   of 
  Lucapina 
  crenulata, 
  Sowerby, 
  the 
  name 
  Megathura 
  calijornica 
  of 
  

   Nuttall 
  MS. 
  Under 
  the 
  present 
  International 
  Laws 
  governing 
  

   nomenclature 
  as 
  exposed 
  by 
  the 
  International 
  Commission 
  in 
  

   Opinion 
  4, 
  the 
  generic 
  name 
  Megathura 
  will 
  supersede 
  the 
  later 
  

   Macrochasma, 
  unless 
  invalidated 
  by 
  some 
  previous 
  use 
  of 
  it. 
  It 
  

   showld 
  be 
  noted 
  that 
  no 
  author 
  can 
  possibly 
  protect 
  himself 
  against 
  

   such 
  occurrences 
  as 
  this, 
  as 
  these 
  MS. 
  names 
  liave 
  never 
  been 
  

   recorded, 
  nor 
  previously 
  legally 
  recognized 
  save 
  in 
  rare 
  cases 
  such 
  as 
  

   the 
  Leach 
  names. 
  

  

  MiTROMOEPHA, 
  auctt., 
  11071 
  Carpenter. 
  

  

  This 
  genus 
  name 
  has 
  been 
  generally 
  accredited 
  to 
  A. 
  Adams, 
  and 
  

   has 
  been 
  used 
  recently 
  for 
  a 
  number 
  of 
  diverse 
  species, 
  both 
  recent 
  

   and 
  fossil, 
  of 
  which 
  possibly 
  not 
  one 
  is 
  congeneric 
  with 
  Adams' 
  

   species. 
  A 
  peculiar 
  confusion 
  has 
  been 
  noted 
  in 
  connection 
  with 
  

   this 
  name, 
  and 
  I 
  had 
  intended 
  to 
  define 
  the 
  generic 
  terms 
  I 
  would 
  

   utilize 
  in 
  connection 
  with 
  recent 
  Australian 
  shells, 
  but 
  since 
  I 
  drew 
  

   up 
  my 
  notes 
  my 
  friend 
  Mr. 
  Charles 
  Hedley 
  has 
  written 
  me 
  that 
  he 
  

   is 
  dealing 
  completely 
  with 
  this 
  group 
  as 
  regards 
  Australian 
  species, 
  

   so 
  I 
  withhold 
  my 
  say 
  until 
  my 
  friend's 
  report 
  has 
  appeared. 
  

   Nevertheless 
  I 
  have 
  certain 
  information 
  which 
  he 
  may 
  not 
  have 
  

   secured, 
  and 
  which 
  it 
  seems 
  expedient 
  to 
  make 
  known. 
  In 
  the 
  British 
  

   Assoc. 
  Report 
  for 
  1863 
  (published 
  August, 
  1864), 
  Carpenter 
  included 
  

   (p. 
  658) 
  ^^ 
  ? 
  Daphnellaf 
  Jilosa, 
  n.s., 
  small, 
  diamond-shaped, 
  but 
  

   rounded 
  periphery 
  ; 
  spirally 
  threaded. 
  f 
  Generic 
  position 
  . 
  . 
  . 
  

   doubtful: 
  perhaps 
  they 
  belong 
  to 
  genera 
  not 
  yet 
  eliminated; 
  ^losa 
  

   resembling 
  the 
  Eocene 
  forms 
  between 
  Conus 
  and 
  Fleuroioma.^' 
  In 
  

   the 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  (ser. 
  iii, 
  vol. 
  xv, 
  February, 
  1865, 
  p. 
  182), 
  

   Carpenter 
  fully 
  described 
  Mitromorpha 
  Jilosa, 
  recording 
  that 
  it 
  was 
  

   the 
  'i 
  Baphnella 
  jilosa 
  of 
  the 
  above 
  entry, 
  and 
  observing, 
  "Mr. 
  A. 
  

   Adams 
  obtained 
  two 
  similar 
  species 
  from 
  Japan, 
  and 
  as 
  the 
  shells 
  do 
  

   not 
  rank 
  satisfactorily 
  under 
  any 
  established 
  group, 
  he 
  proposes 
  the 
  

   above 
  genus 
  for 
  their 
  reception. 
  M. 
  Crosse 
  suggests 
  that 
  Columhella 
  

   dortnitor, 
  Shy., 
  may 
  be 
  congeneric." 
  

  

  