﻿558 
  COLLECTIONS 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN, 
  

  

  spots 
  of 
  a 
  similar 
  colour, 
  which 
  are 
  larger 
  than 
  those 
  with 
  which 
  

   the 
  hand 
  is 
  covered. 
  

  

  To 
  this 
  variety 
  are 
  referred 
  specimens 
  from 
  the 
  Philippines, 
  Cor- 
  

   regidor 
  {Cuming) 
  ; 
  the 
  island 
  of 
  Ty-pin-san 
  (H.M.S. 
  ' 
  Samarang 
  '); 
  

   Keeling 
  or 
  Cocos 
  Islands 
  {Lt. 
  Biirnahy) 
  ; 
  and 
  Fijis, 
  Ovalau 
  {H.M.S. 
  

   ' 
  Herald 
  '). 
  

  

  11. 
  Petrolisthes 
  annulipes, 
  White 
  (med.), 
  Miers. 
  

  

  Seychelles, 
  4-12 
  fms. 
  (IN'o. 
  194) 
  ; 
  an 
  adult 
  female 
  and 
  small 
  male. 
  

  

  The 
  occurrence 
  of 
  this 
  species 
  (described 
  in 
  the 
  preceding 
  part 
  of 
  

   this 
  Report) 
  in 
  the 
  western 
  limits 
  of 
  the 
  Indo-Pacific 
  region 
  proves 
  

   its 
  wide 
  geographical 
  range, 
  and 
  it 
  may 
  be 
  that 
  it 
  will 
  prove 
  to 
  be 
  

   not 
  specifically 
  distinguishable 
  from 
  its 
  near 
  allies 
  P. 
  scahrieula, 
  

   Dana, 
  from 
  the 
  Sooloo 
  Sea, 
  and 
  P. 
  militaris, 
  Heller, 
  from 
  the 
  Nico- 
  

   bars 
  ; 
  but 
  even 
  if 
  it 
  should 
  be 
  necessary 
  to 
  unite 
  the 
  three 
  forms, 
  

   the 
  distinctions 
  referred 
  to 
  in 
  my 
  description 
  of 
  P. 
  annulipes 
  would 
  

   apparently 
  suffice 
  to 
  constitute 
  it 
  a 
  very 
  distinct 
  variety, 
  and 
  I 
  do 
  

   not 
  venture 
  to 
  unite 
  them 
  in 
  the 
  absence 
  of 
  types 
  of 
  the 
  two 
  first- 
  

   mentioned 
  species 
  for 
  comparison. 
  

  

  A 
  small 
  specimen 
  obtained 
  at 
  He 
  des 
  Neufs, 
  15 
  fms. 
  (No. 
  187), 
  

   more 
  nearly 
  resembles 
  P. 
  scahrieula 
  in 
  having 
  the 
  outer 
  margin 
  of 
  

   the 
  palm 
  of 
  the 
  chelipedes 
  pubescent, 
  and 
  a 
  series 
  of 
  spinules 
  ex- 
  

   tending 
  along 
  the 
  whole 
  length 
  of 
  the 
  posterior 
  margin 
  of 
  the 
  wrist, 
  

   but 
  in 
  this 
  specimen 
  the 
  palms 
  arc 
  pubescent, 
  but 
  not 
  transverselv 
  

   striated 
  ; 
  it 
  is 
  probably 
  not 
  fully 
  grown, 
  but 
  1 
  think 
  belongs 
  to 
  a 
  

   distinct 
  species. 
  

  

  12. 
  Petrolisthes 
  maculatus, 
  M.-Eclw. 
  

  

  Since 
  I 
  identify 
  this 
  species 
  with 
  the 
  very 
  short 
  diagnosis 
  of 
  

   P. 
  maculatifs 
  with 
  much 
  uncertainty, 
  I 
  append 
  the 
  following 
  de- 
  

   scription 
  : 
  — 
  

  

  The 
  carapace 
  is 
  rather 
  convex, 
  smooth, 
  and 
  polished, 
  and 
  very 
  

   much 
  longer 
  than 
  broad 
  : 
  the 
  front 
  is 
  slightly 
  deflexed, 
  very 
  pro- 
  

   minent, 
  of 
  a 
  rounded 
  triangulate 
  form, 
  with 
  a 
  slight 
  lateral 
  sinus 
  

   or 
  dilatation 
  above 
  the 
  inner 
  orbital 
  angle 
  ; 
  the 
  outer 
  orbital 
  angle 
  

   is 
  obtuse 
  ; 
  there 
  is 
  a 
  spinule 
  on 
  the 
  lateral 
  margins 
  of 
  the 
  carapace, 
  

   at 
  some 
  distance 
  behind 
  the 
  outer 
  orbital 
  angle 
  ; 
  on 
  the 
  sides 
  of 
  the 
  

   carapace, 
  below 
  the 
  lateral 
  margins, 
  is 
  a 
  longitudinal 
  furrow. 
  The 
  

   second 
  joint 
  of 
  the 
  peduncle 
  of 
  the 
  antennae 
  bears 
  an 
  acute 
  lobe 
  or 
  

   spine. 
  The 
  chelipedes 
  are 
  smooth 
  and 
  naked 
  ; 
  the 
  merus-joint 
  is 
  

   very 
  short, 
  with 
  a 
  tooth 
  or 
  lobe 
  at 
  its 
  antero-interual 
  angle 
  ; 
  the 
  

   anterior 
  margin 
  of 
  the 
  wrist 
  is 
  armed 
  with 
  a 
  prominent 
  acute 
  sub- 
  

   basal 
  tooth 
  or 
  lobe, 
  followed 
  by 
  one 
  or 
  two 
  very 
  indistinct 
  smaller 
  

   teeth 
  ; 
  the 
  posterior 
  margin 
  is 
  entire 
  ; 
  the 
  palm 
  is 
  flat 
  and 
  smooth 
  

   above, 
  its 
  anterior 
  margin 
  bordered 
  by 
  a 
  raised 
  line, 
  its 
  posterior 
  

   margin 
  (and 
  that 
  of 
  the 
  immobile 
  finger) 
  cristiform 
  and 
  acute 
  ; 
  tho 
  

  

  