﻿1863.] 
  JENKINS 
  JAVAN 
  FOSSILS. 
  55 
  

  

  them. 
  Between 
  the 
  coloured 
  stripes 
  in 
  the 
  central 
  part 
  of 
  the 
  shell 
  

   there 
  are 
  indications 
  of 
  a 
  row 
  of 
  coloured 
  dots, 
  or 
  of 
  another 
  stripe 
  ; 
  

   and 
  this 
  ornament 
  is 
  rendered 
  more 
  complex 
  by 
  the 
  presence 
  of 
  

   subordinate 
  raised 
  bands 
  (probably 
  the 
  remains 
  of 
  thin 
  light-coloured 
  

   stripes), 
  to 
  the 
  number 
  of 
  two 
  or 
  three, 
  between 
  each 
  coloured 
  band, 
  

   and 
  of 
  very 
  fine, 
  impressed 
  hair-lines 
  not 
  quite 
  coinciding 
  in 
  direc- 
  

   tion 
  with 
  the 
  coloured 
  stripes. 
  All 
  these 
  bands 
  are 
  crossed 
  more 
  or 
  

   less 
  at 
  right 
  angles 
  by 
  the 
  lines 
  of 
  growth. 
  

  

  This 
  species 
  is 
  closely 
  related 
  to 
  Conus 
  fuscocingulatus, 
  Bronn, 
  dif- 
  

   fering 
  from 
  it, 
  somewhat, 
  in 
  the 
  characters 
  of 
  the 
  coloured 
  rings, 
  and 
  

   essentially 
  in 
  those 
  of 
  the 
  suture 
  and 
  the 
  upper 
  portion 
  of 
  the 
  shell. 
  

  

  Of 
  the 
  specimens 
  of 
  Conus 
  sent 
  by 
  M. 
  de 
  Groot, 
  there 
  are 
  two 
  

   (one 
  a 
  very 
  imperfect 
  specimen, 
  three 
  times 
  as 
  large 
  as 
  any 
  of 
  the 
  

   others, 
  and 
  one 
  about 
  the 
  same 
  size 
  as 
  the 
  remainder) 
  which 
  may 
  

   belong 
  to 
  a 
  distinct 
  but 
  related 
  species. 
  This 
  cannot 
  be 
  decided 
  

   properly 
  without 
  more 
  perfect 
  specimens 
  ; 
  and 
  as 
  it 
  is 
  better 
  to 
  omit 
  

   a 
  species 
  than 
  to 
  make 
  one 
  unnecessarily, 
  I 
  prefer 
  leaving 
  the 
  matter 
  

   in 
  abeyance 
  for 
  the 
  present, 
  although 
  the 
  absence 
  of 
  the 
  mucronate 
  

   spire, 
  and 
  the 
  much 
  narrower 
  aperture, 
  in 
  the 
  two 
  specimens 
  referred 
  

   to, 
  render 
  it 
  very 
  probable 
  that 
  they 
  are 
  really 
  distinct. 
  

  

  Dimensions. 
  — 
  Length 
  1 
  inch, 
  breadth 
  J 
  inch 
  ; 
  length 
  of 
  aperture 
  

   |^ 
  inch, 
  breadth 
  ^ 
  inch. 
  The 
  dimensions 
  of 
  the 
  two 
  specimens 
  

   which 
  I 
  suppose 
  to 
  belong 
  to 
  a 
  distinct 
  species 
  are 
  as 
  follows 
  : 
  — 
  

   large 
  specimen, 
  length 
  2-i- 
  inches, 
  breadth 
  1^ 
  inch 
  ; 
  small 
  specimen 
  : 
  

   length 
  -J-J- 
  inch, 
  breadth 
  -i-J 
  inch 
  ; 
  length 
  of 
  aperture 
  -J4J- 
  inch, 
  breadth 
  

   -^ 
  inch. 
  

  

  Matrix. 
  — 
  Greyish 
  marly 
  sand 
  in 
  the 
  specimens 
  referred 
  to 
  this 
  

   species. 
  The 
  large 
  specimen 
  alluded 
  to 
  above 
  is 
  filled 
  with 
  a 
  greenish- 
  

   grey 
  sandstone 
  containing 
  large 
  flakes 
  of 
  a 
  black 
  substance 
  resem- 
  

   bling 
  charred 
  wood. 
  

  

  9. 
  Natica 
  Duncani, 
  spec. 
  nov. 
  PL 
  VI. 
  fig. 
  6. 
  

  

  Shell 
  thick, 
  ovate, 
  rather 
  narrowly 
  umbilicate, 
  with 
  a 
  produced 
  

   spire. 
  Whorls 
  almost 
  flat 
  and 
  obtusely 
  grooved 
  next 
  the 
  suture, 
  

   then 
  abruptly 
  and 
  somewhat 
  convexly 
  declining. 
  Aperture 
  ovate, 
  

   almost 
  flat 
  at 
  the 
  base. 
  Columella 
  angular, 
  thick, 
  especially 
  near 
  

   the 
  apex 
  of 
  the 
  aperture, 
  flat 
  in 
  front, 
  and 
  with 
  a 
  rather 
  broad 
  co- 
  

   lumnar 
  callosity 
  entering 
  the 
  umbilicus. 
  Lines 
  of 
  growth 
  very 
  dis- 
  

   tinct. 
  Operculum 
  broadly 
  half-heart-shaped, 
  thick, 
  especially 
  near 
  

   the 
  columellar 
  margin, 
  broad 
  at 
  the 
  base 
  ; 
  convex 
  margin 
  reflexed 
  

   outwardly, 
  with 
  a 
  narrow 
  groove 
  on 
  the 
  outer 
  side 
  close 
  to 
  the 
  edge, 
  

   and 
  a 
  deeper 
  parallel 
  groove 
  at 
  a 
  distance 
  of 
  -^ 
  inch 
  inside 
  it. 
  

  

  The 
  two 
  specimens 
  which 
  I 
  refer 
  to 
  this 
  species 
  differ 
  from 
  

   Natica 
  maculosa, 
  Lam., 
  to 
  which 
  they 
  bear 
  some 
  resemblance, 
  in 
  

   having 
  the 
  whorls 
  flatter 
  near 
  the 
  suture, 
  in 
  being 
  more 
  truncate 
  at 
  

   the 
  base 
  of 
  the 
  mouth, 
  and 
  in 
  the 
  columella 
  and 
  the 
  whole 
  shell 
  

   being 
  much 
  thicker. 
  The 
  thickness 
  of 
  the 
  upper 
  portion 
  of 
  the 
  co- 
  

   lumella 
  and 
  the 
  truncated 
  base 
  of 
  the 
  mouth 
  give 
  the 
  aperture 
  an 
  

   almost 
  triangular 
  shape, 
  and 
  the 
  whole 
  shell 
  a 
  somewhat 
  remarkable 
  

   appearance. 
  

  

  