﻿MOLLXTSCA. 
  105 
  

  

  guishing 
  character 
  in 
  species 
  of 
  this 
  genus. 
  It 
  recalls 
  to 
  mind 
  D. 
  

   lateralis, 
  mihi, 
  from 
  the 
  island 
  of 
  Rodriguez, 
  although 
  it 
  is 
  sutficiently 
  

   distinct 
  in 
  form. 
  The 
  anterior 
  side 
  is 
  longer, 
  the 
  beaks 
  less 
  lateral, 
  

   and 
  the 
  height 
  of 
  the 
  shell 
  in 
  proportion 
  to 
  the 
  length 
  is 
  greater. 
  

  

  45. 
  Kellia 
  jacksoniana. 
  (Plate 
  VII. 
  figs. 
  F, 
  F 
  1.) 
  

  

  Shell 
  obliquely 
  and 
  subquadrately 
  rounded, 
  rather 
  convex, 
  pale 
  

   grey, 
  a 
  little 
  transparent 
  towards 
  the 
  umbones, 
  inequilateral 
  ; 
  ante- 
  

   rior 
  end, 
  or 
  that 
  toward 
  which 
  the 
  beaks 
  incline, 
  much 
  shorter 
  than 
  

   the 
  posterior. 
  Front 
  margin 
  obliquely 
  curved 
  ; 
  base 
  straightish, 
  

   but 
  little 
  arcuate. 
  Hinder 
  extremity 
  produced 
  somewhat 
  at 
  the 
  

   lower 
  part. 
  Surface 
  a 
  little 
  glossy, 
  concentrically 
  striated, 
  some 
  of 
  

   the 
  striae 
  towards 
  the 
  margin 
  more 
  pronounced 
  than 
  those 
  nearer 
  the 
  

   umbones. 
  The 
  latter 
  a 
  trifle 
  prominent 
  above 
  the 
  hinge-line, 
  

   approximated, 
  terminating 
  in 
  an 
  incurved 
  vitreous 
  glossy 
  apex. 
  

   Teeth 
  strong 
  ; 
  in 
  the 
  right 
  valve 
  one 
  immediately 
  beneath 
  the 
  umbo 
  

   and 
  another 
  posterior 
  to 
  the 
  ligament 
  ; 
  the 
  left 
  valve 
  has 
  two 
  be- 
  

   neath 
  the 
  umbo 
  and 
  one 
  posterior 
  to 
  the 
  ligament. 
  Muscular 
  scars 
  

   large, 
  placed 
  high 
  up, 
  the 
  anterior 
  subpyriform, 
  the 
  posterior 
  longer. 
  

   Pallial 
  impression 
  joining 
  the 
  scars 
  high 
  up 
  on 
  their 
  outer 
  margin. 
  

   Length 
  7 
  millim., 
  width 
  8i, 
  diam. 
  of 
  closed 
  valves 
  nearly 
  5. 
  

  

  Hab. 
  Port 
  Jackson 
  {Coppinger). 
  

  

  K. 
  rotunda, 
  Deshayes, 
  and 
  K. 
  soUda, 
  Angas, 
  are 
  also 
  Port-Jackson 
  

   species 
  and 
  the 
  nearest 
  allies 
  of 
  the 
  present 
  one. 
  The 
  former 
  is 
  

   almost 
  as 
  long 
  as 
  broad, 
  nearly 
  equilateral, 
  of 
  a 
  thinner 
  growth, 
  

   and 
  has 
  slighter 
  teeth 
  ; 
  the 
  latter 
  is 
  more 
  solid, 
  more 
  transverse, 
  

   rather 
  more 
  equilateral, 
  is 
  opaque 
  white, 
  highly 
  glossy, 
  has 
  the 
  

   interior 
  thickened 
  and 
  subpuuctate, 
  and 
  the 
  pallial 
  impression 
  

   appears 
  to 
  join 
  the 
  lower 
  extremity 
  of 
  the 
  muscular 
  scars. 
  

  

  46. 
  Scintilla 
  ciivieri. 
  

  

  Deshmjes, 
  Proc. 
  Zool. 
  Soc. 
  1S55, 
  p. 
  174 
  ; 
  Soioerhy, 
  Tlies. 
  Conch, 
  vol. 
  iii. 
  

  

  p. 
  180, 
  pi. 
  23.5. 
  figs. 
  59, 
  60 
  ; 
  id. 
  Conch. 
  Icon. 
  figs. 
  15 
  a, 
  b. 
  

   ? 
  Var. 
  =S. 
  flavida, 
  Deshayes, 
  I. 
  c. 
  p. 
  175 
  ; 
  Sowerby, 
  Thes. 
  fig. 
  64; 
  Conch. 
  

  

  Icon. 
  fig. 
  24? 
  

  

  Hah. 
  Port 
  Molle, 
  Queensland 
  {Coppinger) 
  ; 
  Baclayon, 
  island 
  of 
  

   Bohol, 
  Philippines 
  {Cuming) 
  ; 
  Basay, 
  island 
  of 
  Samar 
  (Cuming, 
  for 
  

   yar. 
  flavida). 
  

  

  The 
  figures 
  of 
  this 
  species 
  in 
  the 
  ' 
  Conch. 
  Icon.' 
  are 
  most 
  inaccu- 
  

   rate, 
  and 
  that 
  in 
  the 
  ' 
  Thesaurus,' 
  although 
  much 
  better, 
  is 
  not 
  

   quite 
  correct. 
  The 
  umbones 
  are 
  smaller, 
  more 
  acute, 
  and 
  incline 
  

   anteriorly, 
  and 
  the 
  colour 
  is 
  not 
  nearly 
  so 
  bright 
  as 
  depicted 
  in 
  

   the 
  figure. 
  The 
  representation 
  of 
  the 
  var. 
  flavida, 
  fig, 
  64, 
  is 
  still 
  

   more 
  unfaithful 
  ; 
  the 
  hinder 
  margin 
  is 
  not 
  obliquely 
  truncate, 
  but 
  

   curved. 
  I 
  cannot 
  discover 
  any 
  material 
  distinction 
  in 
  this 
  variety. 
  

   It 
  is 
  smaller, 
  which 
  may 
  be 
  a 
  matter 
  of 
  age, 
  and 
  the 
  type 
  is 
  slightly 
  

   narrower 
  than 
  the 
  type 
  of 
  S. 
  eavieri 
  ; 
  but 
  of 
  both 
  forms 
  I 
  have 
  

  

  