﻿306 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  last 
  segment, 
  which 
  arc 
  broadly 
  rounded. 
  The 
  eyes 
  are 
  borne 
  on 
  

   the 
  broadly 
  rounded 
  postero-lateral 
  lobes 
  of 
  the 
  head. 
  The 
  first 
  

   segment 
  of 
  the 
  peduncle 
  of 
  the 
  autennules 
  is 
  about 
  twice 
  as 
  long 
  as 
  

   broad 
  and 
  considerably 
  dilated 
  ; 
  the 
  second 
  joint, 
  which 
  is 
  small 
  but 
  

   moderately 
  dilated, 
  is 
  received 
  into 
  a 
  cavity 
  at 
  the 
  distal 
  end 
  of 
  the 
  

   first 
  joint 
  ; 
  the 
  flagella 
  about 
  14-jointed. 
  The 
  peduncular 
  joints 
  of 
  

   the 
  antennae 
  are 
  slender 
  ; 
  the 
  flagella 
  about 
  20-joiuted. 
  The 
  ambu- 
  

   latory 
  legs 
  are 
  very 
  slender 
  ; 
  the 
  merus, 
  carpus, 
  and 
  propus 
  or 
  penul- 
  

   timate 
  joints 
  margined 
  inferiorly 
  with 
  short 
  stiff 
  hairs, 
  and, 
  as 
  in 
  

   other 
  species 
  of 
  the 
  genus, 
  the 
  dactyli 
  bear 
  a 
  small 
  subterminal 
  

   accessory 
  claw. 
  The 
  rami 
  of 
  the 
  uropoda 
  are 
  narrow, 
  entire, 
  nearly 
  

   straight, 
  and 
  rather 
  densely 
  hair}- 
  ; 
  the 
  outer 
  rather 
  shorter 
  than 
  the 
  

   inner 
  ramus, 
  and 
  more 
  acute 
  at 
  its 
  distal 
  extremity 
  ; 
  the 
  inner 
  long, 
  

   projecting 
  by 
  about 
  half 
  its 
  length 
  beyond 
  the 
  terminal 
  segment. 
  , 
  

   Colour 
  (in 
  spirit) 
  yellowish 
  white. 
  Length 
  a 
  little 
  over 
  4 
  lines 
  

   (9 
  millim. 
  ). 
  

  

  A 
  single 
  mutilated 
  specimen 
  was 
  obtained 
  on 
  the 
  beach 
  at 
  

   Thursday 
  Island, 
  Torres 
  Straits, 
  and 
  is 
  evidently 
  a 
  male, 
  the 
  ventral 
  

   genital 
  stylets 
  being 
  very 
  distinctly 
  developed. 
  Two 
  males 
  are 
  in 
  

   the 
  Museum 
  collection 
  without 
  special 
  locality 
  (J. 
  B. 
  Jules), 
  and 
  

   some 
  specimens 
  from 
  Singapore 
  received 
  in 
  the 
  final 
  consignment 
  of 
  

   H.M.S. 
  ' 
  Alert.' 
  

  

  I 
  cannot 
  identify 
  it 
  with 
  any 
  of 
  the 
  Australian 
  species 
  of 
  this 
  

   genus 
  recently 
  described 
  by 
  Mr. 
  Haswell. 
  lu 
  the 
  granulated 
  seg- 
  

   ments 
  of 
  the 
  body 
  it 
  resembles 
  C. 
  bidentata 
  and 
  C. 
  coronata, 
  Haswell, 
  

   both 
  obtained 
  at 
  Griffith's 
  Point, 
  Victoria, 
  but 
  differs 
  in 
  the 
  arma- 
  

   ture 
  of 
  the 
  terminal 
  post 
  abdominal 
  segment. 
  There 
  are 
  specimens 
  

   in 
  the 
  British-Museum 
  collection 
  from 
  Bass 
  Straits 
  (J. 
  Macgillivray, 
  

   H.M.S. 
  ' 
  Rattlesnake 
  ") 
  which 
  I 
  refer 
  to 
  C. 
  coronata, 
  having 
  the 
  

   tubercles 
  on 
  the 
  dorsal 
  surface 
  of 
  the 
  postabdomen 
  disposed 
  as 
  in 
  

   Mr. 
  Haswell's 
  diagnosis, 
  but 
  differing 
  in 
  the 
  acute 
  inner 
  ramus 
  of 
  

   the 
  uropoda. 
  

  

  C. 
  hngist]/lrs 
  is 
  also 
  very 
  nearly 
  allied 
  to 
  the 
  European 
  C. 
  truncatn, 
  

   Leach, 
  but 
  is 
  distinguished 
  bj' 
  the 
  much 
  longer 
  and 
  slenderer 
  inner 
  

   ramus 
  of 
  the 
  uropoda. 
  However, 
  I 
  am 
  not 
  sure 
  that 
  the 
  examination 
  

   of 
  a 
  sufficient 
  series 
  would 
  not 
  necessitate 
  uniting 
  the 
  two 
  species. 
  

  

  9. 
  Cerceis 
  bidentata, 
  M.-Edw., 
  var. 
  aspericaudata. 
  

   (Plate 
  XXXTII. 
  fig. 
  D.) 
  

  

  Thus 
  is 
  designated 
  with 
  much 
  hesitation 
  a 
  specimen 
  (male) 
  from 
  

   Prince 
  of 
  Wales 
  Channel, 
  7 
  fms. 
  (No. 
  169). 
  As 
  Milne-Edwards's 
  

   diagnosis 
  is 
  very 
  brief, 
  I 
  subjoin 
  the 
  following 
  description 
  of 
  the 
  

   principal 
  distinctive 
  characters 
  presented 
  by 
  the 
  specimen 
  before 
  

   me 
  : 
  — 
  

  

  The 
  body 
  is 
  convex 
  with 
  the 
  sides 
  straight, 
  and 
  widens 
  gradually 
  

   to 
  the 
  tail. 
  Head 
  subtriangulate, 
  but 
  with 
  the 
  anterior 
  margin 
  

   rounded 
  ; 
  the 
  rostral 
  lobe 
  is 
  inflexed, 
  and 
  lies 
  between 
  the 
  bases 
  of 
  

   the 
  autennules 
  ; 
  the 
  postero-lateral 
  lobes, 
  which 
  bear 
  the 
  small 
  black 
  

  

  