﻿112 
  COLLECTIOl^S 
  FROM 
  MELANESIA. 
  

  

  a 
  transparent 
  white 
  colour, 
  and 
  not 
  pale 
  olive-green 
  like 
  the 
  rest 
  

   of 
  the 
  surface. 
  At 
  the 
  anterior 
  end 
  a 
  few 
  oblique 
  lines, 
  commencing 
  

   at 
  the 
  ridge 
  which 
  borders 
  the 
  luuide, 
  fall 
  across 
  the 
  concentric 
  

   sculpture, 
  but 
  are 
  only 
  noticeable 
  in 
  certain 
  lights. 
  The 
  dorsal 
  

   margin 
  is 
  very 
  faintly 
  arcuate 
  in 
  front 
  and 
  scarcely 
  descending, 
  a 
  

   trifle 
  more 
  oblique 
  behind, 
  and 
  rectilinear 
  except 
  near 
  the 
  extremity, 
  

   where 
  there 
  is 
  a 
  very 
  feeble 
  sinuation. 
  The 
  lower 
  outline 
  is 
  broadly 
  

   arcuate, 
  considerably 
  upcurvingin 
  front, 
  and 
  at 
  its 
  junction 
  with 
  the 
  

   - 
  dorsal 
  edge 
  forms 
  an 
  obtuse 
  or 
  rounded 
  angle 
  ; 
  at 
  the 
  posterior 
  

   end 
  it 
  ascends 
  more 
  gently 
  (the 
  curve 
  being 
  indistinctly 
  interrupted 
  

   by 
  a 
  very 
  faint 
  prominence 
  which 
  defines 
  the 
  portion 
  of 
  the 
  surface 
  

   upon 
  which 
  the 
  concentric 
  ridges 
  are 
  finer 
  than 
  elsewhere), 
  pro- 
  

   ducing 
  with 
  the 
  dorsal 
  slope 
  a 
  sharpish 
  rostrate 
  end. 
  The 
  umbones 
  

   are 
  rather 
  large 
  and 
  prominent, 
  coarsely 
  concentrically 
  sculptured, 
  

   situated 
  a 
  little 
  posterior 
  to 
  the 
  centre, 
  and 
  incline 
  somewhat 
  

   towards 
  the 
  hinder 
  side. 
  The 
  dorsal 
  areas 
  are 
  distinctly 
  defined 
  by 
  

   elevated 
  margins, 
  and 
  the 
  posterior 
  is 
  broader 
  than 
  the 
  anterior 
  or 
  

   lunule. 
  Teeth 
  about 
  43 
  in 
  number, 
  whereof 
  about 
  16 
  are 
  on 
  

   the 
  posterior 
  side, 
  and 
  the 
  vest 
  in 
  front. 
  The 
  interior 
  of 
  the 
  valves 
  

   is 
  transparent 
  milky 
  white, 
  and 
  the 
  margin 
  is 
  acute 
  and 
  smooth. 
  

   The 
  pallial 
  sinus 
  is 
  deep, 
  narrow, 
  and 
  rounded 
  at 
  the 
  end. 
  Length 
  

   17g 
  millim., 
  height 
  Og, 
  diameter 
  7. 
  

   • 
  Hab. 
  Port 
  Darwin, 
  8-12 
  fms., 
  mud 
  and 
  sand 
  bottom. 
  

  

  This 
  species 
  is 
  very 
  closely 
  related 
  to 
  L. 
  confusa, 
  Hanley. 
  It 
  is, 
  

   however, 
  thinner, 
  not 
  so 
  equilateral, 
  more 
  coarsely 
  sculptured, 
  has 
  

   more 
  prominent 
  umbones, 
  and 
  the 
  margin 
  of 
  the 
  valves 
  is 
  not 
  

   minutely 
  crenulated 
  within. 
  

  

  62. 
  Malleus 
  legtiinen. 
  

  

  Beeve, 
  Conch. 
  Icon. 
  fig. 
  2. 
  

  

  Rah. 
  Philippine 
  Islands 
  (Cuming); 
  Port 
  Curtis 
  {Coppinger). 
  

  

  The 
  interior 
  of 
  this 
  species 
  is 
  waxy 
  white, 
  except 
  the 
  upper 
  part 
  

   of 
  the 
  nacreous 
  portion 
  beneath 
  the 
  ligament, 
  where 
  there 
  is 
  a 
  large 
  

   dark 
  purplish 
  spot. 
  The 
  non-nacreous 
  portion 
  exhibits 
  a 
  raised 
  sub- 
  

   central 
  ridge 
  extending 
  from 
  the 
  margin 
  of 
  the 
  pearly 
  lining 
  nearly 
  

   to 
  the 
  lower 
  extremity. 
  

  

  63. 
  Avicula 
  lata. 
  

  

  Gray, 
  1845, 
  Ap^wndix 
  to 
  Eyre's 
  Central 
  Australia, 
  p. 
  435, 
  pi. 
  6. 
  fig. 
  1 
  ; 
  

  

  lieeve, 
  Conch. 
  Icon. 
  fig. 
  5. 
  

   Avicula 
  serrulata, 
  Dunker, 
  Zeitschr. 
  f. 
  Malak. 
  1848, 
  p. 
  178 
  ; 
  Conch.- 
  

  

  Cah. 
  ed. 
  2, 
  p. 
  18, 
  pi. 
  5. 
  figs. 
  1, 
  2. 
  

  

  Hah. 
  West 
  Island, 
  Torres 
  Straits, 
  in 
  7 
  fms., 
  sand 
  {Coppinger); 
  

   Port 
  Essington 
  (/. 
  B. 
  Jiikes 
  in 
  Brit. 
  Mus.) 
  ; 
  Raino's 
  Island, 
  Torres 
  

   Straits 
  (Lieut. 
  Ince, 
  B.N., 
  in 
  Mus. 
  Cuming) 
  ; 
  Moluccas 
  (DunJctr). 
  

  

  Eeeve 
  and 
  Dunker 
  appear 
  to 
  have 
  been 
  unaware 
  that 
  this 
  species 
  

   was 
  both 
  figured 
  and 
  described 
  by 
  Gray. 
  Apparently, 
  as 
  a 
  rule, 
  it 
  

   is 
  longer 
  than 
  cither 
  of 
  the 
  specimens 
  figured 
  in 
  the 
  ' 
  Conch. 
  Icon.' 
  or 
  

  

  