﻿522 
  COLLECTIONS 
  FROM 
  THE 
  "WESTERK 
  INDIAN 
  OCEAN. 
  

  

  tJircetis 
  as 
  figured 
  by 
  Von 
  Martens, 
  reacliing 
  to 
  the 
  distal 
  end 
  of 
  the 
  

   inner 
  margin, 
  wliicli 
  is 
  toothed 
  as 
  in 
  S. 
  eri/thrcens; 
  tliis 
  joint 
  has 
  a 
  

   convex 
  shining 
  prominence 
  at 
  its 
  outer 
  and 
  distal 
  angle. 
  The 
  merus- 
  

   joint 
  is 
  less 
  deeply 
  excavated 
  where 
  it 
  is 
  articulated 
  with 
  the 
  ischium 
  

   than 
  in 
  S. 
  eri/thranis, 
  and, 
  as 
  already 
  stated, 
  there 
  is 
  a 
  tooth 
  in 
  the 
  

   notch 
  on 
  the 
  inner 
  margin 
  Avhere 
  the 
  carpus-joint 
  is 
  articulated 
  

   with 
  it, 
  and 
  its 
  extero-distal 
  angle 
  is 
  produced 
  and 
  acute 
  ; 
  the 
  lobe 
  

   on 
  the 
  inner 
  margin 
  of 
  the 
  exognath 
  is 
  acute. 
  The 
  chelipedes 
  (in 
  

   the 
  male) 
  are 
  of 
  moderate 
  length 
  ; 
  merus 
  and 
  carpus 
  granulated 
  ; 
  

   palm 
  granulated 
  above, 
  and 
  with 
  a 
  longitudinal 
  series 
  of 
  gi-anules 
  

   on 
  its 
  outer 
  and 
  inner 
  surface 
  ; 
  fingers 
  arcuated 
  and 
  meeting 
  (in 
  

   the 
  adult) 
  only 
  toward 
  the 
  apices, 
  where 
  they 
  are 
  denticuUited. 
  

   The 
  ambulatory 
  legs 
  are 
  slender 
  and 
  decrease 
  in 
  length 
  from 
  the 
  

   first 
  to 
  the 
  last, 
  the 
  first 
  pair 
  being 
  much 
  elongated. 
  Colour 
  (in 
  

   spirit) 
  yellowish 
  or 
  purplish. 
  Length 
  of 
  carapace 
  (without 
  rostrum) 
  

   9 
  lines 
  (19 
  millim.). 
  

  

  6. 
  Paramithrax 
  (Clilorinoides) 
  longispinus, 
  De 
  Haan, 
  

   var, 
  bituberculatus. 
  

  

  An 
  adult 
  but 
  small 
  male 
  from 
  Darros 
  Island, 
  22 
  fms. 
  (No. 
  185), 
  

   and 
  two 
  small 
  males 
  and 
  a 
  female 
  obtained 
  at 
  Providence 
  Island, 
  

   19 
  fms. 
  (No. 
  217), 
  are 
  referred 
  to 
  this 
  species, 
  which 
  has 
  evidently 
  

   a 
  wide 
  Oriental 
  distribution. 
  

  

  They 
  are 
  distinguished 
  from 
  P. 
  longispimis 
  as 
  figured 
  by 
  De 
  Haan 
  

   merely 
  by 
  having 
  the 
  lower 
  (immobile) 
  finger 
  as 
  well 
  as 
  the 
  dactylus 
  

   armed 
  with 
  a 
  tooth 
  or 
  tubercle 
  on 
  its 
  inner 
  margin 
  in 
  the 
  males, 
  

   and 
  the 
  upper 
  margin 
  of 
  the 
  palm 
  straight 
  and 
  entire, 
  not 
  dentated; 
  

   the 
  spines 
  of 
  the 
  carapace 
  and 
  legs 
  are 
  small. 
  The 
  anterior 
  prae- 
  

   orbital 
  spine 
  is 
  more 
  or 
  less 
  recurved, 
  as 
  in 
  De 
  Haan's 
  figure 
  of 
  the 
  

   Japanese 
  type. 
  

  

  From 
  P. 
  copiviigeri, 
  Haswell, 
  referred 
  to 
  in 
  the 
  first 
  part 
  of 
  

   this 
  Eeport, 
  this 
  species 
  is 
  distinguished 
  not 
  merely 
  by 
  the 
  form 
  of 
  

   the 
  chelipedes, 
  but 
  by 
  the 
  less 
  elongated 
  carapace 
  and 
  ambulatory 
  

   legs. 
  

  

  7. 
  Hyastenus 
  (Chorilia) 
  oryx, 
  A. 
  M.-Edw. 
  

  

  Two 
  females 
  and 
  two 
  small 
  males 
  are 
  in 
  the 
  collection 
  from 
  

   Providence 
  Island, 
  19 
  fms, 
  (No. 
  217). 
  

  

  These 
  specimens 
  are 
  of 
  interest 
  as 
  showing 
  the 
  wide 
  Oriental 
  

   distribution 
  of 
  this 
  species, 
  which 
  had 
  not 
  previously 
  been 
  recorded, 
  

   I 
  believe, 
  from 
  the 
  AV 
  astern 
  division 
  of 
  the 
  Indo-Pacific 
  Region. 
  It 
  

   has 
  already 
  been 
  noticed 
  in 
  the 
  first 
  part 
  of 
  this 
  Heport 
  (p. 
  195). 
  

  

  8. 
  Hyastenus 
  (Chorilia) 
  ovatus, 
  

  

  Lahalna 
  ovata, 
  Dana, 
  Amer. 
  Journ. 
  Sci. 
  Sf 
  Arts, 
  ser. 
  2, 
  xi. 
  p. 
  2G9 
  

   (1851) 
  ; 
  U.S. 
  Expl 
  Exped., 
  Crust, 
  i. 
  p. 
  92, 
  pi. 
  ii/. 
  tig. 
  1 
  (1853). 
  

  

  A 
  small 
  but 
  adult 
  female 
  is 
  referred 
  to 
  this 
  species 
  from 
  Poivro 
  

  

  