﻿240 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  small 
  pits 
  ; 
  this 
  coating, 
  whicli 
  is 
  apparently 
  the 
  natural 
  covering 
  

   of 
  the 
  species, 
  is 
  entirely 
  absent 
  from 
  the 
  transverse 
  depressions, 
  

   but 
  covers 
  in 
  great 
  part 
  the 
  ventral 
  surface 
  of 
  the 
  body 
  and 
  the 
  legs. 
  

   The 
  front 
  is 
  rather 
  less 
  than 
  one 
  third 
  the 
  greatest 
  width 
  of 
  the 
  

   carapace 
  and 
  is 
  notched 
  in 
  the 
  middle 
  ; 
  the 
  very 
  short 
  antero 
  -lateral 
  

   margins 
  are 
  armed 
  with 
  three 
  rather 
  obscure 
  teeth, 
  whereof 
  the 
  

   first 
  is 
  situated 
  at 
  some 
  distance 
  from 
  the 
  orbit 
  and 
  the 
  last 
  at 
  the 
  

   angle 
  formed 
  by 
  the 
  junction 
  of 
  the 
  antero-lateral 
  with 
  the 
  postero- 
  

   lateral 
  margins, 
  which 
  is 
  also 
  the 
  point 
  at 
  which 
  the 
  carapace 
  

   is 
  deflexed. 
  The 
  male 
  postabdomen 
  is 
  as 
  broad 
  at 
  base 
  as 
  the 
  

   sternum 
  and 
  is 
  7-jointed 
  ; 
  the 
  first 
  two 
  joints 
  shorter 
  than 
  the 
  rest, 
  

   the 
  last 
  subtriangulate 
  with 
  a 
  rounded 
  apex. 
  The 
  antennules 
  are 
  

   nearly 
  transversely 
  plicated 
  ; 
  the 
  basal 
  antennal 
  joint 
  reaches 
  nearly 
  

   to 
  the 
  subfrontal 
  process 
  ; 
  the 
  following 
  joints 
  are 
  slender, 
  the 
  

   flagellum 
  somewhat 
  elongated. 
  The 
  maxillipedes 
  (whose 
  form 
  is 
  

   described 
  above) 
  have 
  the 
  fifth 
  joints 
  articulated 
  with 
  the 
  merus 
  at 
  

   its 
  antero-internal 
  angle. 
  The 
  chelipedes, 
  for 
  so 
  small 
  a 
  species, 
  are 
  

   rather 
  robust 
  ; 
  merus 
  trigonous 
  and 
  more 
  or 
  less 
  granulated 
  ; 
  carpus 
  

   (or 
  wrist) 
  and 
  palm 
  granulated 
  on 
  their 
  upper 
  and 
  outer 
  surfaces, 
  the 
  

   granulations 
  disposed 
  in 
  reticulating 
  lines, 
  the 
  intervening 
  spaces 
  or 
  

   pits 
  between 
  which 
  are 
  smooth 
  ; 
  the 
  fingers 
  are 
  shorter 
  than 
  the 
  

   palm, 
  acute 
  at 
  the 
  apices, 
  and 
  dentated 
  and 
  meeting 
  along 
  their 
  inner 
  

   margins. 
  The 
  ambulatory 
  legs 
  are 
  of 
  moderate 
  length 
  ; 
  the 
  merus- 
  

   joints 
  are 
  rather 
  slender, 
  trigonous, 
  with 
  the 
  margins 
  thin-edged 
  or 
  

   carinated, 
  as 
  are 
  also 
  the 
  upper 
  margins 
  of 
  the 
  two 
  following 
  

   joints 
  ; 
  the 
  dactyli 
  are 
  slender 
  and 
  styliform. 
  The 
  male 
  verges 
  

   arise 
  directly 
  from 
  the 
  bases 
  of 
  the 
  fifth 
  ambulatory 
  legs, 
  and 
  are 
  

   not 
  contained 
  in 
  sternal 
  channels 
  ; 
  they 
  are 
  rather 
  broad 
  at 
  base 
  

   and 
  strongly 
  recurved 
  at 
  the 
  distal 
  extremities. 
  Colour 
  (in 
  spirit) 
  

   whitish. 
  The 
  length 
  of 
  the 
  largest 
  example 
  I 
  have 
  seen 
  is 
  barely 
  

   2| 
  lines 
  (.5 
  millim.), 
  and 
  width 
  less 
  than 
  3 
  lines 
  (6 
  millim.). 
  

  

  Two 
  male 
  specimens 
  were 
  collected 
  in 
  Prince 
  of 
  Wales 
  Channel, 
  

   at 
  7-y 
  fms. 
  (No. 
  169). 
  

  

  85. 
  Pseudorhombila 
  vestita 
  {De 
  Haan), 
  var. 
  sexdentata, 
  Haswell. 
  

   (Plate 
  XXIV. 
  fig. 
  B.) 
  

  

  PPEucrate 
  sexdeutatus, 
  HasiceU, 
  Cat. 
  Austr. 
  Crust, 
  p. 
  8G(1882). 
  

  

  The 
  carapace 
  and 
  legs 
  are 
  scantily 
  pubescent 
  ; 
  the 
  carapace 
  is 
  

   little 
  broader 
  than 
  long 
  and 
  is 
  anteriorly 
  defiexed 
  ; 
  the 
  front 
  is 
  

   about 
  one 
  third 
  the 
  greatest 
  width 
  of 
  the 
  carapace, 
  with 
  its 
  anterior 
  

   margin 
  straight 
  and 
  entire, 
  the 
  antero-lateral 
  margins 
  shorter 
  than 
  

   the 
  postero-lateral 
  and 
  armed 
  with 
  three 
  teeth 
  (including 
  the 
  tooth 
  

   or 
  lobe 
  at 
  the 
  outer 
  orbital 
  angle) 
  ; 
  the 
  posterior 
  tooth 
  is 
  longest, 
  

   spiniform, 
  and 
  projects 
  laterally 
  ; 
  the 
  upper 
  margins 
  of 
  the 
  orbits 
  are 
  

   sinuated, 
  the 
  lower 
  obscurcl}' 
  granulated, 
  and 
  there 
  is 
  a 
  very 
  wide 
  

   hiatus 
  on 
  the 
  inner 
  side 
  of 
  the 
  orbit. 
  All 
  of 
  the 
  postabdominal 
  

   segments 
  are 
  distinct 
  ; 
  the 
  second 
  and 
  third 
  segments, 
  although 
  

   laterally 
  produced, 
  do 
  not 
  reach 
  quite 
  to 
  the 
  bases 
  of 
  the 
  fifth 
  

  

  