﻿MOLLUSC 
  A. 
  75 
  

  

  Euchelus 
  deuigratus, 
  //. 
  Sf 
  A. 
  Adams, 
  Gen. 
  Heo. 
  Moll. 
  i. 
  p. 
  418, 
  

  

  pi. 
  47. 
  figs. 
  6-06. 
  

   Var. 
  = 
  Monodonta 
  sulcifera, 
  A. 
  Adams, 
  Proc. 
  Zool. 
  Sac. 
  18-)1, 
  p. 
  175. 
  

   Yar. 
  minor 
  = 
  Euchelus 
  bruimeus, 
  Adams 
  i^- 
  Angas, 
  MS.? 
  in 
  Mus. 
  

  

  Cuminy 
  lij' 
  Angas. 
  

  

  Hah. 
  Port 
  Molle 
  and 
  Port 
  Curtis, 
  Queensland 
  {Copinnger). 
  

  

  This 
  species 
  varies 
  considerablj' 
  in 
  size 
  and 
  colour. 
  The 
  tj'pical 
  

   forra, 
  as 
  figured 
  by 
  Philippi, 
  is 
  a 
  small 
  strong 
  shell 
  of 
  a 
  black-brown 
  

   colour, 
  the 
  spiral 
  gvanulous 
  ridges 
  being 
  articulated 
  with 
  yellowish 
  

   white. 
  The 
  columellar 
  tooth 
  is 
  well 
  developed 
  ; 
  the 
  aperture 
  small 
  

   and 
  strongly 
  sulcate 
  within, 
  especially 
  at 
  the 
  base. 
  Another 
  form 
  

   is 
  considerably 
  larger, 
  having 
  a 
  total 
  length 
  of 
  25 
  millim. 
  In 
  this 
  

   variety, 
  which 
  is 
  generally 
  of 
  a 
  lilac-black 
  colour, 
  paler 
  between 
  the 
  

   ridges, 
  the 
  articulation 
  u2)on 
  the 
  latter 
  is 
  less 
  conspicuous, 
  the 
  tooth 
  

   on 
  the 
  columella 
  smaller, 
  the 
  aperture 
  more 
  slightly 
  sulcate, 
  and 
  the 
  

   whole 
  structure 
  of 
  the 
  shell 
  proportionally 
  thinner 
  than 
  the 
  typical 
  

   form. 
  Monodonta 
  sulcifera 
  is 
  a 
  light-coloured 
  variety, 
  with 
  very 
  

   little 
  articulation 
  or 
  spotting, 
  and 
  of 
  immature 
  growth. 
  This 
  

   accounts 
  for 
  the 
  words 
  "labro 
  tenui 
  " 
  and 
  "columella 
  ad 
  basin 
  tri- 
  

   sulcata 
  '■ 
  in 
  Adams's 
  diagnosis. 
  The 
  latter 
  feature 
  is 
  not 
  strongly 
  

   marked 
  even 
  in 
  the 
  type, 
  and 
  in 
  the 
  adult 
  shell 
  it 
  becomes 
  obli- 
  

   terated 
  by 
  the 
  deposition 
  of 
  callus 
  and 
  nacre. 
  Euchelus 
  hrunneus, 
  

   which 
  appears 
  to 
  be 
  a 
  MS. 
  name 
  attached 
  to 
  shells 
  in 
  the 
  Cumingian 
  

   collection 
  and 
  to 
  a 
  series 
  presented 
  to 
  the 
  British 
  Museum 
  by 
  

   Mr. 
  G. 
  F. 
  Angas, 
  is 
  a 
  dwarf 
  variety, 
  and 
  with 
  the 
  exception 
  of 
  size 
  

   (10 
  millim. 
  in 
  length) 
  agrees 
  in 
  all 
  respects 
  with 
  the 
  normal 
  form. 
  

   The 
  following 
  is 
  the 
  geographical 
  distribution 
  of 
  the 
  species 
  : 
  — 
  

  

  Nicobar 
  Islands 
  {Chemnitz); 
  Tonga-Tabou, 
  Vanikoro 
  (Quojf) 
  ; 
  

   Kingsmill 
  Island, 
  Timor, 
  Plores 
  (Martens) 
  ; 
  New 
  Guinea, 
  Fiji 
  

   Islands 
  (Brit. 
  3Ius.); 
  N.E. 
  Australia, 
  Torres 
  Straits 
  and 
  Port 
  

   Essington 
  (large 
  var. 
  in 
  Brit. 
  Mus.) 
  ; 
  Eoebuck 
  Bay, 
  North 
  Australia 
  

   (var. 
  sulcifera) 
  ; 
  Moreton 
  Bay 
  (Angas) 
  Snd 
  Sydney 
  (Mus. 
  Cuming) 
  

   for 
  var. 
  brunnea. 
  

  

  98. 
  Bankivia 
  (Leiopyrga) 
  picturata. 
  (Plate 
  VI. 
  figs. 
  C-C 
  2.) 
  

  

  Leiopyrga 
  picturata, 
  H. 
  ^ 
  A. 
  Adams, 
  Ann. 
  Sf 
  Mac/. 
  Nat. 
  Hist. 
  1863, 
  

   vol. 
  xi. 
  p. 
  19; 
  Angas, 
  Proc. 
  Zool. 
  Soc. 
  1865, 
  p. 
  181, 
  1867, 
  p. 
  216. 
  

  

  Hah. 
  St. 
  Vincent's 
  Gulf, 
  South 
  Australia 
  (Angas) 
  ; 
  Middle 
  

   Harbour, 
  Port 
  Jackson 
  (Angas 
  and 
  Coppinger) 
  ; 
  Stuart 
  Island, 
  New 
  

   Zealand 
  (G. 
  Traill). 
  

  

  This 
  is 
  a 
  very 
  pretty 
  species, 
  presenting 
  variations 
  in 
  colouring 
  

   very 
  similar 
  to 
  those 
  of 
  the 
  common 
  E. 
  varians. 
  The 
  form 
  originally 
  

   described 
  by 
  Adams 
  is 
  whitish, 
  ornamented 
  with 
  fine 
  undulating 
  

   longitudinal 
  red-brown 
  or 
  pinkish 
  lines, 
  which, 
  at 
  the 
  sutures 
  and 
  

   at 
  the 
  periphery 
  of 
  the 
  last 
  whorl, 
  are 
  darker 
  and 
  assume 
  the 
  

   appearance 
  of 
  spots. 
  

  

  Another 
  variety 
  has 
  the 
  middle 
  of 
  the 
  whorls 
  encircled 
  by 
  a 
  plain 
  

   narrow 
  zone, 
  without 
  the 
  scries 
  of 
  spots 
  at 
  the 
  periphery 
  of 
  the 
  last. 
  

  

  