﻿206 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  it 
  differs 
  in 
  the 
  character 
  of 
  the 
  tuberculation 
  of 
  the 
  carapace 
  and 
  

   legs. 
  In 
  the 
  smaller 
  examples 
  the 
  tubercles 
  are 
  much 
  smaller 
  and 
  

   more 
  acute, 
  and 
  these 
  specimens 
  have 
  much 
  the 
  aspect 
  of 
  certain 
  

   Actcece^ 
  e. 
  g. 
  A. 
  granulata, 
  Audouin, 
  and^. 
  carcharias, 
  'White 
  ; 
  from 
  

   both 
  of 
  which 
  species 
  they 
  may 
  be 
  distinguished 
  upon 
  the 
  most 
  

   superficial 
  examination 
  by 
  the 
  smoothness 
  of 
  the 
  sternum 
  and 
  post- 
  

   abdomen. 
  

  

  A 
  small 
  specimen 
  from 
  Tasmania 
  in 
  the 
  British-Museum 
  collec- 
  

   tion, 
  designated 
  " 
  X. 
  peronii, 
  M.-Edw.," 
  in, 
  I 
  think, 
  Prof. 
  A. 
  

   Milne-Edwards's 
  handwriting, 
  and 
  two 
  from 
  Bass 
  Straits, 
  received 
  

   with 
  fishes 
  of 
  H.M.S. 
  ' 
  Challenger 
  ' 
  collection, 
  are 
  intermediate 
  be- 
  

   tween 
  this 
  genus 
  and 
  Actcea, 
  and 
  are 
  principally 
  distinguished 
  by 
  

   the 
  smooth, 
  more 
  distinctly 
  separated 
  and 
  rounded 
  tubercles 
  of 
  the 
  

   carapace 
  and 
  the 
  longer 
  spines 
  of 
  the 
  ambulatory 
  legs. 
  I 
  believe 
  

   the 
  Xantho 
  spinosus 
  of 
  Hess 
  to 
  be 
  identical 
  with 
  A. 
  peronii. 
  

  

  Actaiodes 
  polyacantlius* 
  , 
  from 
  the 
  Red 
  Sea, 
  comes 
  very 
  near 
  this 
  

   species, 
  but 
  has 
  five 
  acute 
  antero-latcral 
  marginal 
  teeth, 
  &c. 
  

  

  Euxanthus 
  mamlatus, 
  Haswellf 
  (which 
  is 
  only 
  known 
  to 
  me 
  by 
  

   the 
  author's 
  brief 
  diagnosis), 
  from 
  Darnlcy 
  Island, 
  differs 
  in 
  the 
  

   form 
  of 
  the 
  teeth 
  of 
  the 
  antero-latcral 
  margins 
  and 
  the 
  existence 
  of 
  

   longitudinal 
  rows 
  of 
  pits 
  on 
  the 
  outer 
  surface 
  of 
  the 
  hands. 
  

  

  34, 
  Hypoccelus 
  pxaictatus. 
  (Plate 
  XIX. 
  fig. 
  B.) 
  

  

  The 
  carapace 
  is 
  transverse, 
  somewhat 
  broader 
  in 
  proportion 
  to 
  its 
  

   length 
  than 
  are 
  specimens 
  of 
  ff. 
  SGuIp)tus 
  in 
  the 
  Museum 
  collection. 
  

   As 
  in 
  that 
  species 
  it 
  is 
  everywhere 
  strongly 
  lobulated, 
  the 
  lobules 
  

   rounded, 
  convex, 
  and 
  separated 
  by 
  deep 
  intervening 
  grooves, 
  the 
  

   cervical 
  suture 
  being 
  even 
  wider 
  and 
  deeper 
  than 
  the 
  rest 
  ; 
  the 
  lobules 
  

   are 
  rather 
  coarsely 
  punctulated. 
  The 
  front 
  is 
  rather 
  obscurely 
  

   bilobated 
  (besides 
  the 
  rounded 
  lobe 
  over 
  the 
  inner 
  orbital 
  angle) 
  ; 
  the 
  

   antero 
  -lateral 
  margins 
  are 
  strongly 
  arcuated 
  and 
  cristiform, 
  with 
  

   scarcely 
  any 
  indications 
  of 
  any 
  antero-lateral 
  teeth 
  except 
  the 
  last, 
  

   which 
  is 
  small 
  and 
  little 
  prominent 
  ; 
  the 
  postero-lateral 
  margins 
  are 
  

   shorter 
  than 
  the 
  antero-lateral 
  margins 
  and 
  dee2)ly 
  concave. 
  The 
  

   inferior 
  parts 
  of 
  the 
  body 
  are 
  more 
  or 
  less 
  coarsely 
  pitted 
  ; 
  the 
  

   pterygostomian 
  cavity 
  is 
  smaller 
  than 
  in 
  B. 
  sculptus, 
  but 
  rather 
  

   wider 
  tlian 
  in 
  a 
  specimen 
  of 
  H. 
  granulatus 
  in 
  the 
  Museum 
  collection, 
  

   nearly 
  ovate 
  in 
  outline, 
  and 
  divided 
  along 
  its 
  greatest 
  width 
  by 
  a 
  

   crest 
  running 
  parallel 
  to 
  that 
  part 
  of 
  the 
  antero-lateral 
  margin 
  that 
  

   borders 
  the 
  cavity 
  above. 
  The 
  basal 
  antennal 
  joint 
  enters 
  the 
  inner 
  

   orbital 
  hiatus, 
  but 
  not 
  so 
  deeply 
  as 
  in 
  H. 
  sculptus. 
  The 
  chelipedes 
  

   resemble 
  those 
  of 
  H. 
  sculptus 
  ; 
  the 
  wrist 
  and 
  pahn, 
  however, 
  are 
  

   strongly 
  pitted 
  on 
  their 
  upper 
  and 
  outer 
  surfaces, 
  whereas 
  in 
  speci- 
  

   mens 
  of 
  B. 
  scidptus 
  in 
  the 
  Museum 
  collection 
  these 
  pits 
  are 
  absent 
  

   from 
  the 
  wrist 
  and 
  from 
  the 
  upper 
  surface 
  of 
  the 
  palm, 
  Fingers 
  

  

  * 
  Chlorodius 
  poll/acanthus, 
  Heller, 
  Sitz. 
  Akad. 
  Wien, 
  xliii. 
  (i.) 
  p. 
  339, 
  pi. 
  ii. 
  

   fig. 
  21 
  (1861). 
  

  

  t 
  Proc. 
  Linn. 
  Soc. 
  N. 
  S. 
  Wales, 
  vi. 
  p. 
  751 
  (1881); 
  and 
  'Catalogue,' 
  p. 
  48 
  

   (1882). 
  

  

  