﻿CRTTSTACEA. 
  205 
  

  

  33. 
  Euxanthus 
  tuberculosus. 
  (Plate 
  XIX. 
  fig. 
  A.) 
  

  

  Carapace 
  transverse, 
  moderately 
  convex, 
  everywhere 
  covered 
  with 
  

   numerous 
  closely- 
  set 
  rounded 
  tubercles, 
  which 
  in 
  the 
  adult 
  are 
  

   themselves 
  distinctly 
  puuctulated 
  ; 
  similar 
  tubercles 
  cover 
  the 
  outer 
  

   surface 
  of 
  the 
  wrist 
  and 
  palm 
  of 
  the 
  chelipedes 
  and 
  the 
  posterior 
  

   surface 
  of 
  the 
  ambulatory 
  legs 
  ; 
  the 
  cervical 
  suture 
  and 
  the 
  suture 
  

   defining 
  the 
  anterior 
  part 
  of 
  the 
  mesogastric 
  lobe 
  are 
  deep 
  and 
  well 
  

   defined 
  ; 
  the 
  tubercles 
  are 
  smallest, 
  but 
  yet 
  distinct, 
  on 
  the 
  cardiac 
  

   and 
  intestinal 
  regions 
  and 
  posterior 
  and 
  postero-lateral 
  margins 
  ; 
  the 
  

   frontal 
  margin 
  is 
  divided 
  by 
  a 
  rather 
  deep 
  median 
  notch 
  ; 
  the 
  antero- 
  

   lateral 
  margins 
  are 
  divided 
  into 
  four 
  rounded 
  tuberculated 
  lobes, 
  

   the 
  first 
  of 
  which 
  is 
  often 
  scarcely 
  distinguishable. 
  The 
  parts 
  of 
  the 
  

   body 
  immediately 
  below 
  the 
  antero-lateral 
  margins 
  are 
  granulated, 
  

   but 
  the 
  rest 
  of 
  the 
  inferior 
  surface 
  is 
  nearly 
  smooth, 
  the 
  sternum 
  

   and 
  postabdomen 
  rather 
  coarsely 
  puuctulated 
  ; 
  the 
  basal 
  antennal 
  

   joint 
  enters 
  (in 
  the 
  adult) 
  well 
  within 
  the 
  inner 
  orbital 
  hiatus 
  ; 
  the 
  

   merus-joiut 
  of 
  the 
  outer 
  maxillipedes 
  is 
  transverse 
  and 
  much 
  shorter 
  

   than 
  the 
  preceding 
  joint. 
  The 
  chelipedes 
  are 
  robust 
  ; 
  the 
  merus 
  or 
  

   arm 
  short, 
  and 
  tuberculated 
  at 
  its 
  upper 
  and 
  distal 
  extremity 
  ; 
  wrist 
  

   and 
  palm 
  (as 
  stated 
  above) 
  closely 
  tuberculated 
  on 
  their 
  upper 
  and 
  

   outer 
  surfaces, 
  the 
  tubercles, 
  even 
  in 
  the 
  adult, 
  somewhat 
  conical 
  

   and 
  acute 
  ; 
  inner 
  margin 
  of 
  the. 
  palm 
  having 
  some 
  small 
  granules; 
  

   fingers 
  shorter 
  than 
  the 
  palm, 
  denticulated 
  on 
  their 
  inner 
  margins, 
  

   and 
  having 
  between 
  them 
  when 
  closed 
  scarcely 
  any 
  hiatus 
  ; 
  mobile 
  

   finger 
  granulated 
  above 
  at 
  base 
  ; 
  both 
  fingers 
  obtuse 
  and 
  rounded 
  at 
  

   apex, 
  or 
  (in 
  the 
  smaller 
  examples 
  especially) 
  even 
  somewhat 
  exca- 
  

   vated. 
  The 
  fourth 
  to 
  sixth 
  joints 
  of 
  the 
  ambulatory 
  legs 
  are 
  com- 
  

   pressed, 
  tuberculated 
  ; 
  the 
  tubercles 
  (of 
  the 
  superior 
  margin 
  

   especially) 
  high, 
  conical, 
  and 
  acute 
  ; 
  the 
  dactyli 
  are 
  small, 
  slender, 
  

   armed 
  with 
  small 
  subspiniform 
  granules, 
  and 
  pubescent 
  distally, 
  with 
  

   a 
  small 
  naked 
  terminal 
  claw. 
  Length 
  of 
  the 
  largest 
  adult 
  example 
  

   (from 
  which 
  the 
  description 
  is 
  taken) 
  11 
  lines 
  (23 
  millim,), 
  greatest 
  

   width 
  nearly 
  1 
  inch 
  4 
  lines 
  (33 
  millim.). 
  

  

  Of 
  this 
  species, 
  an 
  apparently 
  adult 
  but 
  not 
  full-sized 
  male 
  

   and 
  female 
  are 
  in 
  the 
  second 
  collection 
  from 
  Thursday 
  Island 
  

   (No. 
  167), 
  obtained 
  on 
  the 
  beach; 
  a 
  young 
  male 
  from 
  the 
  same 
  

   locality 
  (No. 
  177), 
  and 
  another 
  young 
  example 
  from 
  Warrior 
  

   Reef, 
  Torres 
  Straits, 
  10 
  fms. 
  (no. 
  137). 
  There 
  are 
  in 
  the 
  British- 
  

   Museum 
  collection 
  a 
  male 
  from 
  N. 
  Australia 
  {Dr. 
  J. 
  R. 
  Elsey), 
  

   and 
  an 
  adult 
  male 
  from 
  the 
  Australian 
  seas 
  without 
  definite 
  loca- 
  

   lity, 
  from 
  which 
  the 
  description 
  and 
  figure 
  are 
  taken 
  {Dr. 
  J. 
  S. 
  

   Bowerhank). 
  The 
  coloration 
  varies 
  in 
  the 
  different 
  examples, 
  aU 
  

   of 
  which 
  are 
  preserved 
  in 
  spirit 
  : 
  the 
  two 
  specimens 
  which 
  have 
  

   been 
  longest 
  in 
  the 
  collection 
  are 
  a 
  chocolate- 
  brown 
  ; 
  the 
  two 
  largest 
  

   specimens 
  in 
  the 
  ' 
  Alert 
  ' 
  collection 
  (No. 
  107) 
  are 
  of 
  a 
  deep 
  purplish 
  

   red, 
  and 
  the 
  two 
  smallest 
  of 
  a 
  bright 
  orange 
  hue. 
  

  

  As 
  the 
  basal 
  antennal 
  joint 
  enters 
  well 
  within 
  the 
  inner 
  orbital 
  

   hiatus 
  (see 
  fig. 
  a), 
  this 
  species 
  must, 
  I 
  think, 
  be 
  referred 
  to 
  the 
  

   genus 
  Euxanthus, 
  from 
  all 
  the 
  species 
  of 
  which 
  genus 
  known 
  to 
  me 
  

  

  