﻿270 
  COLLECTIONS 
  FEOM 
  MELANESIA. 
  

  

  are 
  slender 
  ; 
  dactyli 
  short, 
  terminating 
  in 
  a 
  small 
  claw. 
  Colour 
  (in 
  

   the 
  spirit-specimen) 
  pale 
  reddish 
  yellow, 
  punctulated 
  with 
  darker 
  

   red. 
  Length 
  nearly 
  7 
  lines 
  (14 
  millim.), 
  breadth 
  a 
  little 
  over 
  6 
  lines 
  

   (13 
  millim.) 
  ; 
  length 
  of 
  chelipede 
  about 
  11 
  inch 
  (34 
  millim.). 
  

  

  An 
  adult 
  female 
  is 
  in 
  the 
  collection 
  from 
  Thursday 
  Island, 
  obtained 
  

   on 
  the 
  beach 
  (No. 
  167). 
  

  

  There 
  is 
  also 
  in 
  the 
  Museum 
  collection 
  a 
  female 
  from 
  Port 
  Curtis, 
  

   Facing 
  Island, 
  two 
  examples 
  from 
  Torres 
  Straits 
  (./. 
  B. 
  Juices), 
  and 
  

   two 
  from 
  the 
  ' 
  Samarang 
  ' 
  collection, 
  of 
  which 
  one 
  is 
  from 
  Koo- 
  

   Keang-San. 
  

  

  The 
  three 
  distinct 
  spines 
  on 
  the 
  posterior 
  margin 
  of 
  the 
  arm 
  seem 
  

   to 
  distinguish 
  this 
  form 
  from 
  the 
  P. 
  bellis 
  of 
  Heller, 
  from 
  the 
  

   Nicobars 
  — 
  a 
  species, 
  however, 
  which 
  is 
  only 
  briefly 
  characterized. 
  

  

  It 
  is 
  evidently 
  very 
  nearly 
  allied 
  to 
  Petrolistlies 
  ruf/osus 
  (M.- 
  

   Edwards), 
  to 
  which 
  are 
  referred 
  specimens 
  in 
  the 
  British-Museum 
  

   collection 
  from 
  Karachi 
  (KaracJii 
  Museum) 
  and 
  North 
  Australia 
  

   {Dr. 
  J. 
  M, 
  Elseii), 
  which 
  species, 
  however, 
  has 
  the 
  carapace 
  and 
  

   chelipedes 
  covered 
  with 
  well-defined 
  pilifcrous 
  crests, 
  and 
  the 
  teeth 
  

   of 
  the 
  anterior 
  margins 
  of 
  the 
  wrists 
  much 
  more 
  regular 
  in 
  form 
  

   and 
  disposition. 
  

  

  14. 
  Petrolisthes 
  annulipes. 
  (Plate 
  XXIX. 
  fig. 
  B.) 
  

  

  Petrolistlies 
  auuulipes, 
  White, 
  List 
  Crust, 
  Brit. 
  Miis. 
  p. 
  63 
  (1847), 
  

   deseript. 
  nulla. 
  

  

  Carapace 
  moderately 
  convex, 
  scarcely 
  longer 
  than 
  broad, 
  its 
  upper 
  

   surface 
  and 
  also 
  that 
  of 
  the 
  chelipedes 
  transversely 
  striated 
  ; 
  the 
  

   striae 
  imbricated 
  and 
  fringed 
  on 
  the 
  anterior 
  margins 
  with 
  close-set 
  

   short 
  setae 
  ; 
  the 
  front 
  is 
  subtriangulate, 
  moderately 
  prominent, 
  

   slightly 
  concave 
  above, 
  with 
  the 
  apex 
  rounded 
  or 
  subtruncated, 
  and 
  

   the 
  margins 
  usually 
  minutely 
  spinulose 
  ; 
  there 
  is 
  a 
  spine 
  on 
  the 
  

   upper 
  margin 
  of 
  the 
  orbit 
  just 
  in 
  front 
  of 
  the 
  eye-peduncles 
  ; 
  the 
  

   sides 
  of 
  the 
  carapace 
  are 
  armed 
  with 
  about 
  six 
  spines, 
  the 
  first 
  of 
  

   which 
  (when 
  present) 
  is 
  situated 
  just 
  posterior 
  to 
  the 
  outer 
  orbital 
  

   angle, 
  the 
  second 
  a 
  little 
  behind 
  it, 
  the 
  third 
  a 
  little 
  within 
  the 
  

   margin 
  on 
  the 
  front 
  of 
  the 
  branchial 
  region, 
  and 
  the 
  other 
  three 
  on 
  

   the 
  sides 
  of 
  the 
  branchial 
  region 
  aud 
  close 
  to 
  one 
  another. 
  The 
  

   first 
  exposed 
  joint 
  of 
  the 
  antennae 
  is 
  armed 
  with 
  a 
  spine 
  (see 
  fig. 
  h). 
  

   The 
  ischium- 
  and 
  merus-joints 
  of 
  the 
  outer 
  maxillipedes 
  are 
  trans- 
  

   versely 
  striated 
  and 
  setose, 
  like 
  the 
  carapace 
  ; 
  the 
  last 
  three 
  joints 
  

   fringed 
  on 
  their 
  inner 
  margins 
  with 
  very 
  long 
  hairs. 
  The 
  merus- 
  

   joint 
  of 
  the 
  chelipedes 
  is 
  armed 
  with 
  a 
  denticulated 
  lobe 
  at 
  the 
  

   distal 
  end 
  of 
  its 
  inner 
  margin 
  ; 
  the 
  carpus 
  or 
  wrist 
  has 
  five 
  denti- 
  

   culated 
  teeth 
  on 
  its 
  anterior 
  margin, 
  and 
  three 
  or 
  four 
  spines 
  on 
  its 
  

   posterior 
  margin 
  ; 
  the 
  palm 
  is 
  armed 
  with 
  a 
  series 
  of 
  minute 
  spi- 
  

   nules 
  on 
  its 
  outer 
  or 
  posterior 
  margin 
  ; 
  the 
  fingers 
  meet 
  along 
  their 
  

   inner 
  edges, 
  and 
  have 
  their 
  tips 
  incurved 
  and 
  acute. 
  The 
  ambulatory 
  

   legs 
  are 
  somewhat 
  hairy, 
  the 
  merus-joints 
  in 
  the 
  first 
  three 
  pairs 
  

   transversely 
  striated 
  aud 
  setose, 
  and 
  armed 
  with 
  spinules 
  on 
  their 
  

  

  