﻿308 
  COLIECXIONS 
  FROM 
  MELANESIA. 
  

  

  10. 
  Cilicaea 
  latreillei. 
  

  

  Cilicsea 
  latreillei, 
  Leach, 
  Did. 
  Sci. 
  Nat. 
  xii. 
  p. 
  342 
  (1818) 
  ; 
  Desmarest, 
  

  

  Consid. 
  Crust, 
  p. 
  296, 
  pi. 
  xlviii. 
  fig. 
  3 
  (1825). 
  

   Nsesea 
  bidentata, 
  Gucrin, 
  Icon. 
  Crust. 
  Regne 
  Animal, 
  Atlas, 
  pi. 
  xxx. 
  

  

  fig. 
  2 
  (1829-44). 
  

   Splieeroma 
  pubescens, 
  M.-Echvards, 
  Hist. 
  Nat. 
  Crust, 
  iii. 
  p. 
  209 
  

  

  (1840), 
  $ 
  P 
  

   N^sea 
  latreillei, 
  M. 
  -Edwards, 
  Hist. 
  Nat. 
  Crust, 
  iii. 
  p. 
  218 
  (1840). 
  

   Cymodocea 
  piibesceus, 
  Hasioell, 
  Proc. 
  Linn. 
  Soc. 
  N. 
  S. 
  Wales, 
  v. 
  

  

  p. 
  473, 
  pi. 
  xvii. 
  fig. 
  1 
  (1881) 
  ; 
  Cat. 
  Austr. 
  Crust, 
  p. 
  290 
  (1882). 
  

  

  The 
  following 
  is 
  a 
  description 
  of 
  the 
  principal 
  distinctive 
  charac- 
  

   ters 
  of 
  this 
  species, 
  taken 
  fi"om 
  male 
  examples 
  bearing 
  Leach's 
  label 
  

   in 
  the 
  British-Museum 
  collection 
  : 
  — 
  

  

  The 
  segments 
  of 
  the 
  body 
  and 
  uropoda 
  are 
  covered 
  with 
  a 
  very 
  

   short 
  stiff 
  pubescence. 
  The 
  head 
  is 
  transverse 
  ; 
  the 
  eyes 
  are 
  borne 
  

   on 
  the 
  rounded 
  postero-lateral 
  lobes, 
  which 
  are 
  encased 
  in 
  notches 
  

   in 
  the 
  anterior 
  margin 
  of 
  the 
  first 
  thoracic 
  segment 
  : 
  the 
  median 
  

   frontal 
  lobe 
  is 
  subacute 
  and 
  projects 
  between 
  the 
  bases 
  of 
  the 
  

   antennules. 
  The 
  first 
  thoracic 
  segment 
  is 
  slightly 
  longer 
  than 
  the 
  

   following 
  ; 
  its 
  antero-lateral 
  processes 
  are 
  acute 
  ; 
  the 
  postero-lateral 
  

   rather 
  blunt, 
  with 
  the 
  posterior 
  margins 
  slightly 
  hollowed 
  out 
  ; 
  the 
  

   second 
  thoracic 
  segment 
  is 
  rounded, 
  but 
  narrowed 
  on 
  the 
  sides 
  ; 
  the 
  

   third 
  and 
  fourth 
  subacute, 
  the 
  fifth 
  less 
  acute, 
  and 
  the 
  sixth 
  and 
  

   seventh 
  broader 
  and 
  rounded 
  or 
  subtruncated. 
  The 
  dorsal 
  process 
  

   of 
  the 
  penultimate 
  postabdominal 
  segment 
  is 
  simple, 
  straight, 
  its 
  

   apex 
  scarcely 
  acute 
  ; 
  it 
  docs 
  not 
  project 
  far 
  beyond 
  the 
  distal 
  end 
  

   of 
  the 
  terminal 
  segment, 
  which 
  is 
  rather 
  more 
  distinctly 
  granulated 
  

   and 
  has 
  on 
  its 
  upper 
  surface 
  two 
  prominences, 
  situated 
  one 
  on 
  each 
  

   side 
  of 
  the 
  dorsal 
  process 
  of 
  the 
  penultimate 
  segment 
  ; 
  the 
  notch 
  in 
  

   the 
  middle 
  of 
  the 
  posterior 
  margin 
  is 
  rather 
  deep 
  and 
  as 
  broad 
  as 
  

   deep, 
  and 
  is 
  divided 
  by 
  a 
  median 
  subtriangulate 
  lobe. 
  The 
  basal 
  

   joint 
  of 
  the 
  antennules 
  is 
  considerably 
  dilated, 
  longer 
  than 
  broad, 
  

   and 
  is 
  slightly 
  excavated 
  at 
  its 
  distal 
  extremity, 
  where 
  it 
  is 
  arti- 
  

   culated 
  with 
  the 
  next 
  joint. 
  The 
  ambulatory 
  legs 
  are 
  slender; 
  and 
  

   the 
  dactyli 
  are 
  armed 
  below 
  with 
  a 
  small 
  accessory 
  claw. 
  The 
  inner 
  

   ramus 
  of 
  the 
  uropoda 
  is 
  represented 
  by 
  a 
  blunt 
  lobe 
  or 
  process 
  of 
  the 
  

   base 
  ; 
  the 
  outer 
  ramus 
  is 
  straight, 
  not 
  greatly 
  longer 
  than 
  the 
  base, 
  

   and 
  usually 
  bears 
  a 
  small 
  tooth 
  on 
  its 
  outer 
  margin. 
  Length 
  5 
  lines 
  

   (nearly 
  11 
  millim.). 
  

  

  The 
  female 
  scarcely 
  differs, 
  except 
  in 
  wanting 
  the 
  posterior 
  dorsal 
  

   process 
  of 
  the 
  penultimate 
  postabdominal 
  segment, 
  and 
  in 
  the 
  sub- 
  

   equal 
  rami 
  of 
  the 
  uropoda, 
  the 
  inner 
  or 
  immobile 
  ramus 
  being 
  more 
  

   developed, 
  and 
  the 
  outer 
  shorter 
  in 
  the 
  adult, 
  usually 
  more 
  acute 
  at 
  

   its 
  distal 
  extremity, 
  and 
  bearing, 
  as 
  in 
  the 
  male, 
  a 
  tooth 
  on 
  the 
  

   outer 
  margin. 
  It 
  presents 
  all 
  the 
  appearance 
  of 
  a 
  Cymoclocea. 
  

  

  I 
  have 
  scarcely 
  any 
  doubt 
  that 
  the 
  Cipnodocea 
  (or 
  Sphceroma) 
  

   pubescens 
  of 
  Milne-Edwards 
  and 
  Haswell 
  are 
  the 
  female 
  of 
  this 
  

   epecies. 
  All 
  the 
  specimens 
  in 
  the 
  considerable 
  series 
  before 
  me, 
  

   ■with 
  the 
  dorsal 
  process 
  of 
  the 
  postabdomen 
  and 
  rudimentary 
  

  

  