﻿556 
  COLLECTIONS 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN. 
  

  

  tudiual, 
  and 
  cervical 
  sutures 
  well 
  defined 
  ; 
  there 
  is 
  no 
  median 
  rostral 
  

   lobe, 
  and 
  the 
  lateral 
  lobes 
  of 
  the 
  frontal 
  margin 
  (situate 
  between 
  

   the 
  e3'es 
  and 
  antennse) 
  are 
  obtuse 
  and 
  little 
  prominent. 
  These 
  

   lateral 
  margins 
  are 
  armed 
  with 
  a 
  few 
  very 
  small 
  spinules 
  at 
  and 
  

   behind 
  the 
  antero-lateral 
  angles 
  ; 
  the 
  branchial 
  regions 
  are 
  mode- 
  

   rately 
  dilated. 
  The 
  sternum 
  between 
  the 
  bases 
  of 
  the 
  fourth 
  pair 
  

   of 
  legs 
  is 
  of 
  considerable 
  width, 
  and 
  the 
  coxse 
  of 
  this 
  and 
  of 
  the 
  

   third 
  pair 
  widely 
  remote 
  from 
  one 
  another, 
  but 
  those 
  of 
  the 
  first 
  

   and 
  second 
  pair 
  are 
  contiguous. 
  The 
  pOstabdomen 
  (in 
  the 
  female) 
  

   bears 
  three 
  triramose 
  ciliated 
  appendages, 
  and 
  in 
  the 
  middle 
  of 
  its 
  

   inferior 
  surface 
  a 
  strong 
  conical 
  and 
  somewhat 
  hairy 
  fleshy 
  pro- 
  

   tuberance 
  ; 
  above 
  it 
  is 
  protected 
  by 
  membranaceous 
  plates 
  ; 
  its 
  

   terminal 
  segment 
  is 
  very 
  small. 
  The 
  eye-peduncles 
  are 
  thickened 
  

   somewhat 
  distally, 
  and 
  are 
  somewhat 
  longer 
  than 
  the 
  anterior 
  

   margin 
  of 
  the 
  carapace 
  ; 
  their 
  cornese 
  are 
  small 
  and 
  occupy 
  about 
  a 
  

   fifth 
  of 
  the 
  total 
  length 
  ; 
  their 
  basal 
  scales 
  are 
  as 
  broad 
  as 
  long 
  and 
  

   denticulated 
  on 
  the 
  distal 
  margins 
  at 
  and 
  near 
  the 
  antero-internal 
  

   angles. 
  The 
  peduncles 
  of 
  the 
  antennae 
  are 
  rather 
  shorter 
  than 
  the 
  

   eye-peduncles; 
  the 
  antepenultimate 
  joint 
  is 
  armed 
  above 
  with 
  a 
  

   strong 
  setose 
  spine, 
  at 
  base 
  of 
  which 
  is 
  a 
  smaller 
  spine 
  ; 
  the 
  two 
  last 
  

   peduncular 
  joints 
  are 
  slender; 
  the 
  joints 
  of 
  the 
  flagella 
  nearly 
  naked. 
  

   The 
  larger 
  (left) 
  chelipede 
  has 
  a 
  trigonous 
  merus-joint, 
  whose 
  upper 
  

   margin 
  is 
  not 
  toothed, 
  but 
  whose 
  lower 
  margin 
  has 
  about 
  half 
  a 
  

   dozen 
  irregular 
  spines 
  and 
  teeth 
  ; 
  the 
  carpus 
  is 
  spinulose 
  on 
  all 
  its 
  

   upper 
  and 
  outer 
  surface 
  ; 
  the 
  palm 
  (nearly 
  twice 
  as 
  long 
  as 
  the 
  

   wrist) 
  has 
  its 
  upper 
  and 
  half 
  of 
  its 
  outer 
  surface 
  spinulose, 
  

   but 
  the 
  lower 
  half 
  of 
  its 
  outer 
  surface 
  smooth, 
  except 
  at 
  the 
  

   inferior 
  and 
  proximal 
  angle 
  ; 
  the 
  lower 
  margin, 
  both 
  of 
  palm 
  

   and 
  immobile 
  finger, 
  is 
  thin-edged, 
  straight, 
  and 
  spinulose 
  ; 
  the 
  

   inner 
  surface 
  of 
  the 
  palm 
  has 
  a 
  few 
  granules 
  on 
  its 
  upper 
  part 
  ; 
  

   the 
  mobile 
  finger 
  is 
  spinulose 
  above, 
  near 
  the 
  base, 
  and 
  both 
  fingers 
  

   have 
  their 
  apices 
  subacute, 
  with 
  only 
  very 
  small 
  corneous 
  tips. 
  In 
  

   the 
  slender 
  smaller 
  chelipede 
  both 
  wrist 
  and 
  palm 
  are 
  spinulose 
  and 
  

   hairy 
  on 
  their 
  upper 
  and 
  outer 
  surface, 
  the 
  fingers 
  are 
  sub-excavate 
  

   at 
  apex, 
  with 
  corneous 
  tips, 
  the 
  upper 
  spinulose 
  at 
  base; 
  the 
  second 
  

   and 
  third 
  legs 
  are 
  slender 
  and 
  rather 
  hairy, 
  with 
  the 
  dactyli 
  slender, 
  

   arcuated, 
  and 
  much 
  longer 
  than 
  the 
  preceding 
  joints 
  ; 
  on 
  the 
  left 
  

   side 
  the 
  second 
  legs 
  have 
  the 
  penultimate 
  and 
  last 
  joints 
  spinulose 
  

   above, 
  but 
  nearly 
  smooth 
  on 
  the 
  outer 
  surface 
  ; 
  the 
  terminal 
  joint 
  

   externally 
  longitudinally 
  canaliculated 
  ; 
  the 
  third 
  (left 
  leg) 
  has 
  its 
  

   penultimate 
  joint 
  spinulose 
  all 
  over 
  the 
  outer 
  surface 
  ; 
  its 
  terminal 
  

   joint 
  is 
  broken, 
  but 
  was 
  apparently 
  externally 
  longitudinally 
  canali- 
  

   culated 
  and 
  strongly 
  spinulose 
  above 
  ; 
  in 
  the 
  fourth 
  legs 
  the 
  penul- 
  

   timate 
  joint 
  terminates 
  as 
  usual 
  in 
  a 
  scabrous 
  pad, 
  and 
  the 
  dactjd 
  

   is 
  arcuate 
  and 
  denticulated 
  on 
  its 
  inner 
  margin 
  ; 
  the 
  fifth 
  legs 
  are 
  

   apparently 
  more 
  distinctly 
  chelated, 
  and 
  are 
  densely 
  hairy 
  at 
  the 
  

   distal 
  extremity. 
  The 
  chelipedes 
  and 
  ambulatory 
  legs 
  are 
  rather 
  

   scantily 
  clothed 
  with 
  hair. 
  Coloration 
  (in 
  spirit) 
  yellowish 
  with 
  

   reddish 
  patches 
  (interpunctulatcd 
  with 
  white) 
  on 
  the 
  postfrontal 
  

   regions 
  of 
  the 
  carapace, 
  chelipedes, 
  second 
  and 
  third 
  legs. 
  Length 
  

  

  