﻿146 
  

  

  DESCRIPTIOX 
  OF 
  A 
  NEW 
  SPECIES 
  OF 
  VOLUTA 
  FROM 
  

   WEST 
  AUSTRALIA. 
  

  

  By 
  Dr. 
  J. 
  C. 
  Cox. 
  

  

  Read 
  Sth 
  April, 
  1910. 
  

   PLATE 
  III. 
  

  

  The 
  shell 
  about 
  to 
  be 
  described 
  was 
  kindly 
  sent 
  me 
  for 
  identification 
  

   by 
  Mrs. 
  Irvine, 
  of 
  Launceston, 
  Tasmania. 
  Although, 
  unfortunately, 
  

   the 
  spire 
  has 
  been 
  broken 
  the 
  rest 
  of 
  the 
  specimen 
  is 
  in 
  good 
  

   condition, 
  and 
  exhibits 
  features 
  which 
  readily 
  distinguish, 
  it 
  from 
  

   other 
  Australian 
  forms. 
  

  

  VoLUTA 
  NODIPLICATA, 
  U.Sp. 
  

  

  Shell 
  rather 
  large, 
  fusiformly 
  ovate, 
  rather 
  thin, 
  of 
  an 
  uniformly 
  

   yellow 
  cream 
  colour, 
  without 
  any 
  trace 
  of 
  colour-markings; 
  whorls? 
  

   (spire 
  broken) 
  ; 
  body-whorl 
  ovate, 
  rather 
  inflated, 
  exhibiting 
  at 
  the 
  

   upper 
  part 
  eleven 
  moderatel)^ 
  prominent 
  rounded 
  plicae, 
  which, 
  are 
  

   nodose 
  about 
  half 
  an 
  inch 
  from 
  the 
  suture, 
  and 
  gradually 
  become 
  

   obsolete 
  about 
  the 
  middle 
  of 
  the 
  whorl 
  ; 
  above 
  the 
  tubercles, 
  which 
  

   are 
  dark-coloured, 
  the 
  whorl 
  is 
  slightly 
  concave, 
  so 
  that 
  a 
  rounded 
  

   angulation 
  is 
  formed 
  by 
  the 
  tubercular 
  prominences 
  ; 
  the 
  surface 
  

   exhibits 
  fine 
  lines 
  of 
  growth, 
  which 
  are 
  most 
  distinct 
  near 
  the 
  suture 
  

   and 
  between 
  the 
  plicae 
  ; 
  columellar 
  folds 
  three 
  in 
  number, 
  well 
  defined, 
  

   but 
  not 
  conspicuously 
  prominent, 
  the 
  anterior 
  forming 
  the 
  lower 
  

   columellar 
  margin 
  ; 
  outer 
  lip 
  not 
  thickened 
  (immature), 
  showing 
  only 
  

   a 
  broad 
  shallow 
  anterior 
  notch 
  or 
  sinus. 
  Length 
  (of 
  last 
  two 
  whorls) 
  

   125, 
  diam. 
  80 
  mm. 
  ; 
  apertm-e 
  95 
  mm. 
  in 
  length, 
  50 
  in 
  width. 
  

  

  S'ab. 
  — 
  llottnest 
  Island, 
  Western 
  Australia, 
  12 
  miles 
  north-west 
  of 
  

   Fremantle. 
  

  

  This 
  unique 
  specimen 
  was 
  procured 
  from 
  excavations 
  raised 
  during 
  

   the 
  construction 
  of 
  a 
  pier. 
  It 
  is 
  unfortunate 
  that 
  the 
  spire 
  has 
  been 
  

   broken, 
  thus 
  preventing 
  the 
  complete 
  description 
  of 
  the 
  apex. 
  It 
  is 
  

   probable 
  that 
  the 
  outer 
  lip 
  in 
  a 
  more 
  mature 
  specimen 
  would 
  be 
  

   somewhat 
  thickened. 
  

  

  