﻿196 
  COLIECTIONS 
  FEOM 
  MELANESIA. 
  

  

  13. 
  Hyastenus 
  (Chorilia) 
  planasius. 
  

  

  Pisa 
  planasia, 
  Adams 
  i^" 
  White, 
  Crust, 
  in. 
  Zool. 
  Voy. 
  ' 
  Samarang,' 
  

  

  p. 
  9, 
  pi. 
  ii. 
  figs. 
  4,5(1848). 
  

   Hyastenus 
  planasius, 
  A. 
  M.-Edivards, 
  N. 
  Arch. 
  Mus. 
  Hist. 
  Nat. 
  viii. 
  

  

  p. 
  250 
  (1872). 
  

  

  A 
  small 
  male 
  was 
  obtained 
  at 
  Port 
  Denison 
  with 
  H. 
  oryx 
  

   (No. 
  122). 
  The 
  original 
  types 
  (and 
  specimens 
  in 
  the 
  Museum 
  

   collection) 
  were 
  from 
  the 
  Chinese 
  seas. 
  

  

  14. 
  Hyastenus 
  (Chorilia) 
  convexus. 
  (Plate 
  XYIII. 
  fig. 
  B.) 
  

  

  Carapace 
  subpyriform, 
  somewhat 
  scantily 
  pubescent 
  ; 
  gastric 
  region 
  

   elevated, 
  rounded 
  and 
  convex 
  ; 
  cardiac 
  region 
  also 
  somewhat 
  elevated 
  

   and 
  rounded 
  ; 
  branchial 
  regions 
  with 
  three 
  low 
  rounded 
  promi- 
  

   nences 
  ; 
  no 
  lateral 
  epibranchial 
  spine 
  ; 
  the 
  prseocular 
  angle 
  of 
  the 
  

   orbit 
  is 
  prominent, 
  but 
  can 
  scarcely 
  be 
  said 
  to 
  be 
  produced 
  in 
  the 
  

   form 
  of 
  a 
  spine 
  ; 
  there 
  are 
  two 
  spines 
  on 
  the 
  ptcrygostomian 
  

   region, 
  between 
  the 
  lateral 
  margins 
  of 
  the 
  buccal 
  cavity 
  and 
  the 
  

   sides 
  of 
  the 
  carapace. 
  Spines 
  of 
  rostrum 
  slender, 
  nearly 
  straight, 
  

   and 
  strongly 
  divergent. 
  Postahdominal 
  segments 
  distinct. 
  Easal 
  

   antennal 
  joint 
  with 
  a 
  small 
  spine 
  or 
  tooth 
  at 
  its 
  antero-external 
  

   angle. 
  Chelipedes 
  of 
  male 
  of 
  moderate 
  length 
  ; 
  merus 
  or 
  arm 
  

   rather 
  slender 
  and 
  nearly 
  smooth 
  ; 
  wrist 
  with 
  a 
  very 
  small 
  tooth 
  

   on 
  its 
  inner 
  margin 
  ; 
  palm 
  not 
  twice 
  as 
  long 
  as 
  broad, 
  somewhat 
  

   inflated, 
  with 
  a 
  small 
  tubercle 
  on 
  its 
  upper 
  margin 
  ; 
  fingers 
  about 
  

   as 
  long 
  as 
  the 
  palm, 
  arcuated, 
  meeting 
  only 
  toward 
  the 
  apices, 
  

   which 
  are 
  minutely 
  denticulated 
  and 
  acute 
  ; 
  upper 
  finger 
  with 
  a 
  

   tubercle 
  or 
  small 
  tooth 
  on 
  its 
  inner 
  margin 
  near 
  the 
  base 
  ; 
  the 
  

   fingers 
  (when 
  closed) 
  have 
  between 
  them 
  a 
  wide 
  hiatus. 
  Ambu- 
  

   latory 
  legs 
  very 
  slender 
  and 
  smooth 
  ; 
  the 
  anterior 
  pair 
  much 
  the 
  

   longest, 
  the 
  three 
  following 
  diminishing 
  successively 
  in 
  Jength. 
  

   The 
  colour 
  of 
  the 
  single 
  specimen 
  examined 
  is 
  a 
  uniform 
  light 
  

   yellowish 
  brown. 
  Length 
  of 
  carapace 
  a 
  little 
  over 
  5 
  lines 
  (11 
  mm.) 
  ; 
  

   greatest 
  breadth 
  nearly 
  4 
  lines 
  (8 
  mm.) 
  ; 
  length 
  of 
  rostral 
  spine 
  

   a 
  little 
  over 
  3 
  lines 
  (7 
  mm.), 
  of 
  chelipede 
  about 
  6 
  lines 
  (nearly 
  

   13 
  mm.), 
  of 
  first 
  ambulatory 
  leg 
  rather 
  over 
  10 
  lines 
  (22 
  mm.). 
  

  

  The 
  unique 
  male 
  example 
  was 
  obtained 
  at 
  Port 
  Molle, 
  14 
  fms. 
  

   (No. 
  93), 
  and 
  in 
  size 
  and 
  form 
  of 
  the 
  chelipedes 
  is 
  very 
  comparable 
  

   to 
  H. 
  gracilirostris, 
  Miers, 
  from 
  the 
  Fijis, 
  from 
  which, 
  however, 
  it 
  

   is 
  at 
  once 
  distinguished 
  by 
  the 
  absence 
  of 
  spines 
  on 
  the 
  carapace, 
  

   &c. 
  

  

  15. 
  Naxia 
  serpulifera, 
  M.-Edw. 
  

  

  Thursday 
  Island. 
  4-6 
  fms. 
  (No. 
  130), 
  two 
  young 
  males 
  (first 
  

   collection). 
  A 
  good 
  series 
  of 
  different 
  ages 
  and 
  of 
  both 
  sexes 
  from 
  

   the 
  same 
  locality 
  has 
  been 
  retained 
  from 
  the 
  second 
  collection 
  (175). 
  

  

  Specimens 
  are 
  in 
  the 
  British- 
  Museum 
  collection 
  from 
  Shark 
  Bay, 
  

  

  