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  PKOCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  About 
  the 
  same 
  form 
  as 
  the 
  Bombay 
  Patella 
  ader, 
  but 
  differing- 
  in 
  

   other 
  respects. 
  Acmcea 
  parasitica 
  (d'Orbigny) 
  is 
  a 
  little 
  like 
  the 
  

   liresent 
  species, 
  but 
  rather 
  more 
  ovate, 
  and 
  " 
  arched 
  in 
  every 
  direction 
  

   in 
  consequence 
  of 
  attaching 
  itself 
  to 
  other 
  shells" 
  with 
  convex 
  

   surfaces. 
  On 
  the 
  contrary, 
  all 
  the 
  specimens 
  I 
  have 
  seen 
  of 
  

   A. 
  Bomhayana 
  appear 
  to 
  have 
  rested 
  upon 
  flat 
  or 
  almost 
  level 
  surfaces, 
  

   as 
  the 
  margin 
  is 
  even 
  and 
  unarched 
  all 
  round. 
  

  

  The 
  rays 
  are 
  generally 
  of 
  two 
  shades 
  of 
  brown, 
  some 
  much 
  darker 
  

   than 
  others, 
  and 
  the 
  paler 
  ones 
  nearly 
  always 
  falling 
  between 
  the 
  

   white 
  rays, 
  which 
  frequently 
  appear 
  to 
  be 
  in 
  pairs. 
  In 
  addition 
  to 
  

   the 
  rays 
  a 
  fine 
  brown 
  and 
  white 
  reticulation 
  not 
  infrequently 
  occurs. 
  

   The 
  line 
  radiating 
  thread-like 
  lines 
  are 
  only 
  observable 
  in 
  well- 
  

   preserved 
  specimens. 
  The 
  interior 
  is 
  thickened 
  with 
  a 
  white 
  callus 
  

   deposit, 
  excepting 
  the 
  central 
  portion, 
  which 
  is 
  stained 
  a 
  pale 
  livid 
  

   olive 
  and 
  defined 
  from 
  the 
  white 
  part 
  of 
  the 
  interior 
  by 
  a 
  distinct 
  

   horseshoe-shaped 
  margin. 
  The 
  outer 
  lirabus 
  is 
  thin, 
  sharply 
  defined, 
  

   and 
  prettily 
  marked 
  with 
  the 
  ends 
  of 
  the 
  brown 
  and 
  white 
  rays. 
  

  

  Yar. 
  Ceylanica. 
  Pig. 
  D. 
  

  

  Like 
  the 
  type, 
  but 
  a 
  trifle 
  more 
  elevated, 
  without 
  the 
  fine 
  brown 
  

   reticulation, 
  but 
  with 
  the 
  darker 
  rays 
  commencing 
  as 
  spots 
  or 
  dots 
  

   near 
  the 
  apex. 
  Largest 
  specimen 
  19-5 
  mm. 
  in 
  length, 
  16 
  in 
  diameter, 
  

   and 
  9 
  high. 
  

  

  ^«^.— 
  Galle, 
  Ceylon 
  (H. 
  F. 
  Blanford). 
  

  

  The 
  increased 
  elevation 
  of 
  this 
  variety 
  is 
  ])robably 
  due 
  to 
  its 
  

   occurrence 
  in 
  a 
  more 
  exposed 
  position 
  than 
  the 
  Bombay 
  shells. 
  It 
  

   has 
  been 
  observed 
  with 
  regard 
  to 
  our 
  common 
  limpet. 
  Patella 
  vulgata, 
  

   that 
  specimens 
  occurring 
  near 
  high-water 
  mark, 
  and 
  consequently 
  

   more 
  exposed 
  to 
  the 
  breaking 
  of 
  the 
  waves, 
  are 
  higher 
  and 
  more 
  

   conical 
  than 
  those 
  found 
  lower 
  down 
  on 
  the 
  shore. 
  

  

  The 
  Acyncea 
  Travancorica, 
  Preston, 
  has 
  an 
  arched 
  lateral 
  basal 
  

   margin, 
  is 
  differently 
  coloured 
  (" 
  pale 
  brownish 
  yellow 
  with 
  occasional 
  

   blotches 
  of 
  dark 
  purple 
  "), 
  and 
  more 
  roughly 
  sculptured. 
  The 
  colour 
  

   of 
  the 
  interior 
  of 
  the 
  shell 
  is 
  not 
  described, 
  but 
  it 
  is 
  merely 
  said 
  to 
  be 
  

   iridescent. 
  The 
  margin 
  is 
  described 
  as 
  " 
  regularly 
  spotted 
  with 
  

   purple". 
  This 
  iridescence 
  and 
  the 
  apparent 
  absence 
  of 
  a 
  defined 
  

   limbus 
  or 
  border 
  seem 
  to 
  indicate 
  that 
  this 
  species 
  has 
  more 
  affinity 
  

   to 
  the 
  Patellidse 
  than 
  the 
  Acmoeiclse. 
  

  

  