﻿CRUSTACEA. 
  559 
  

  

  fingers 
  ai'e 
  acute, 
  slightly 
  incurved 
  at 
  the 
  tips, 
  and 
  have 
  their 
  inner 
  

   margins 
  thin-edged 
  and 
  entire 
  ; 
  the 
  three 
  following 
  pairs 
  of 
  legs 
  

   have 
  the 
  joints 
  smooth, 
  naked, 
  and 
  rounded 
  ; 
  the 
  merus-joints 
  but 
  

   little 
  thickened 
  and 
  -without 
  spinules 
  ; 
  the 
  penultimate 
  joints 
  have 
  

   a 
  small 
  mobile 
  spinule 
  at 
  the 
  distal 
  end 
  of 
  their 
  posterior 
  margin 
  ; 
  

   dactylus 
  with 
  a 
  single 
  small 
  accessory 
  spinule. 
  The 
  whole 
  of 
  the 
  

   upper 
  and 
  lateral 
  surface 
  of 
  the 
  carapace 
  and 
  the 
  legs 
  are 
  closely 
  

   punctulated 
  with 
  small 
  circular 
  red 
  spots 
  ; 
  the 
  ground-colour 
  is 
  

   yellowish. 
  Length 
  of 
  carapace 
  nearly 
  6 
  lines 
  (12 
  millim.). 
  

  

  A 
  single 
  male 
  was 
  obtained 
  on 
  the 
  beach 
  at 
  Mozambique, 
  between 
  

   tide-marks 
  (No. 
  224). 
  

  

  There 
  is 
  scarcely 
  any 
  character 
  mentioned 
  in 
  M. 
  Milne-Edwards's 
  

   very 
  short 
  description, 
  based 
  on 
  a 
  specimen 
  from 
  New 
  Ireland, 
  

   that 
  will 
  not 
  apply 
  to 
  the 
  specimen 
  from 
  Mozambique, 
  unless 
  it 
  be 
  

   what 
  relates 
  to 
  the 
  spines 
  of 
  the 
  wrist. 
  

  

  13. 
  Petrolisthes 
  villosus 
  ? 
  

  

  ? 
  Porcellana 
  villosa, 
  Richters, 
  Decapoda, 
  in 
  Mobius's 
  Beitrdgc 
  zur 
  

   Meeresfauna 
  der 
  Insel 
  Mauritius 
  und 
  der 
  Seychellen, 
  p. 
  IGO, 
  

   pi. 
  xvii. 
  figs. 
  11, 
  12 
  (1880). 
  

  

  A 
  small 
  male 
  collected 
  at 
  Darros 
  Island 
  (No. 
  200) 
  with 
  P. 
  la- 
  

   marclcii 
  is 
  referred 
  here. 
  To 
  Dr. 
  liichters's 
  short 
  description 
  I 
  may 
  

   add 
  the 
  following 
  : 
  — 
  The 
  median 
  frontal 
  lobe 
  is 
  prominent 
  and 
  

   rounded, 
  and 
  more 
  distinctly 
  defined 
  than 
  in 
  P. 
  lamarclii, 
  var. 
  

   asiatica. 
  There 
  is 
  apparently 
  no 
  spinule 
  on 
  the 
  lateral 
  margin 
  of 
  

   the 
  carapace. 
  There 
  is 
  a 
  strong 
  lobe 
  or 
  tooth 
  at 
  the 
  distal 
  end 
  of 
  

   the 
  merus-joint 
  of 
  the 
  chelipedes 
  ; 
  between 
  the 
  three 
  prominent 
  

   lobes 
  or 
  teeth 
  of 
  the 
  anterior 
  margin 
  of 
  the 
  wrist 
  are 
  one 
  or 
  two 
  

   smaller 
  teeth 
  ; 
  the 
  posterior 
  margin 
  of 
  the 
  wrist 
  is 
  entire. 
  The 
  

   dactyli 
  of 
  the 
  first 
  to 
  third 
  ambulatory 
  legs 
  have 
  three 
  small 
  acces- 
  

   sory 
  spinules. 
  This 
  species 
  has 
  been 
  hitherto 
  a 
  desideratum 
  to 
  the 
  

   Museum 
  collection. 
  

  

  14. 
  Polyonyx 
  biunguiculatus 
  (Dana). 
  

  

  Several 
  specimens 
  from 
  the 
  Seychelles, 
  4-12 
  fms. 
  (No. 
  194), 
  and 
  

   Etoile 
  Island, 
  13 
  fms. 
  (No. 
  191), 
  are 
  referred 
  to 
  this 
  species, 
  which, 
  

   as 
  I 
  have 
  stated 
  in 
  the 
  preceding 
  part 
  of 
  this 
  Eeport 
  (p. 
  271), 
  is 
  dis- 
  

   tinguished 
  from 
  P. 
  ohcsulus 
  by 
  the 
  much 
  more 
  prominent 
  and 
  acute 
  

   median 
  lobe 
  of 
  the 
  front. 
  I 
  may 
  add 
  that 
  the 
  specimens 
  I 
  have 
  

   examined, 
  both 
  from 
  the 
  ' 
  Alert 
  ' 
  collection 
  and 
  from 
  the 
  Gulf 
  of 
  

   Suez 
  {R. 
  IlacAndrew), 
  have 
  a 
  prominent 
  lobe 
  at 
  theinner 
  and 
  distal 
  

   angle 
  of 
  the 
  merus-joint 
  of 
  the 
  chelipedes, 
  which 
  is 
  not 
  represented 
  

   in 
  Dana's 
  figure 
  of 
  this 
  species, 
  and 
  which 
  is 
  scarcely 
  or 
  not 
  at 
  all 
  

   developed 
  in 
  P. 
  obesulus. 
  This 
  character 
  will 
  perhaps 
  be 
  found 
  

   sufficient 
  to 
  distinguish 
  these 
  specimens 
  from 
  P. 
  binuf/uicnlatus, 
  

   Dana, 
  at 
  least 
  as 
  a 
  marked 
  variety. 
  

  

  