﻿CEITSTACEA. 
  303 
  

  

  beyond 
  the 
  distal 
  extremity 
  of 
  the 
  terminal 
  segment. 
  " 
  Colour 
  (in 
  

   spirit) 
  yellowish 
  white. 
  The 
  length 
  of 
  Dr. 
  Coj^pinger's 
  largest 
  spe- 
  

   cimen 
  is 
  little 
  over 
  8| 
  lines 
  (18 
  millim.) 
  ; 
  but 
  the 
  largest 
  example 
  

   in 
  the 
  British-Museum 
  collection 
  is 
  of 
  much 
  greater 
  size, 
  measuring 
  

   not 
  less 
  than 
  1 
  inch 
  2| 
  lines 
  (31 
  millim.). 
  

  

  Two 
  specimens 
  were 
  dredged 
  in 
  the 
  Arafura 
  Sea, 
  32-36 
  fms. 
  

   (No. 
  160). 
  

  

  There 
  are 
  in 
  the 
  British-Museum 
  collection 
  several 
  specimens 
  

   collected 
  in 
  Torres 
  Straits 
  (J. 
  B. 
  Jukes). 
  AU 
  of 
  these 
  appear 
  to 
  be 
  

   of 
  the 
  male 
  sex. 
  The 
  terminal 
  segment 
  (only) 
  is 
  slightly 
  pubescent 
  

   above. 
  

  

  The 
  mandible 
  closely 
  resembles 
  that 
  of 
  C. 
  lurtlpes 
  as 
  figui'cd 
  by 
  

   Milne-Edwards*, 
  in 
  its 
  truncated 
  and 
  strongly 
  dentated 
  apex, 
  sen- 
  

   sorial 
  appendage, 
  and 
  triarticulate 
  palpus 
  ; 
  the 
  maxillipede 
  is 
  also 
  

   formed 
  on 
  a 
  precisely 
  similar 
  type 
  to 
  that 
  of 
  C. 
  hirtijjes. 
  

  

  The 
  form 
  of 
  the 
  interantennal 
  plate, 
  which 
  somewhat 
  resembles 
  

   that 
  of 
  certain 
  -^ga' 
  (e.g. 
  JEga 
  siJom/iopJiila), 
  and 
  of 
  the 
  lateral 
  pro- 
  

   longations 
  of 
  the 
  second 
  to 
  fourth 
  segments 
  of 
  the 
  postabdomen 
  at 
  

   once 
  distinguish 
  this 
  species 
  from 
  Cirolana 
  hirtipes, 
  M.-Edw., 
  and 
  

   C. 
  rossii, 
  Miers, 
  and 
  from 
  Cirolana 
  (Eurydice) 
  swainsonii, 
  Leach, 
  a 
  

   Mediterranean 
  and 
  West-African 
  form, 
  to 
  which 
  C. 
  schiodtei 
  is 
  very 
  

   nearly 
  allied, 
  ^ga 
  novizealandia;, 
  Dana, 
  and 
  Cirolana 
  latistylis 
  

   and 
  orientaUs, 
  all 
  of 
  them 
  forms 
  somewhat 
  insufficiently 
  described, 
  

   appear 
  to 
  be 
  distinguished 
  by 
  the 
  much 
  more 
  rounded 
  and 
  less 
  

   triangulate 
  terminal 
  segment, 
  &c. 
  C. 
  arabica, 
  Kossmann, 
  to 
  judge 
  

   from 
  his 
  figuresf, 
  is 
  distinguished 
  by 
  the 
  form 
  of 
  the 
  rostrum, 
  

   terminal 
  segment, 
  and 
  interantennal 
  plate 
  both 
  from 
  this 
  and 
  the 
  

   following 
  species. 
  

  

  5. 
  Cirolana 
  tenuistylis. 
  (Plate 
  XXXIII. 
  fig. 
  B.) 
  

  

  As 
  this 
  species 
  in 
  many 
  particulars 
  nearly 
  resembles 
  the 
  foregoing, 
  

   it 
  may 
  sufiice 
  here 
  to 
  point 
  out 
  its 
  chief 
  distinctive 
  characters. 
  The 
  

   interantennal 
  process 
  is 
  narrow-linear, 
  as 
  in 
  C. 
  rossii 
  or 
  C. 
  hirtipes, 
  

   but 
  the 
  eyes 
  are 
  subquadrate 
  or 
  somewhat 
  rounded, 
  with 
  very 
  large 
  

   ocelli, 
  and 
  each 
  occupy 
  less 
  than 
  one 
  fourth 
  of 
  the 
  total 
  length 
  of 
  the 
  

   front 
  and 
  lateral 
  margins 
  of 
  the 
  head, 
  which 
  has 
  a 
  more 
  prominent 
  

   median 
  frontal 
  process. 
  The 
  antennules 
  have 
  the 
  first 
  two 
  joints 
  of 
  

   the 
  peduncle 
  more 
  dilated, 
  the 
  second 
  very 
  short, 
  the 
  third 
  robust, 
  

   but 
  less 
  dilated 
  than 
  the 
  preceding 
  ; 
  the 
  last 
  two 
  joints 
  of 
  the 
  peduncle 
  

   of 
  the 
  antennae 
  are 
  shorter 
  than 
  in 
  C. 
  scMbdtei. 
  The 
  third 
  and 
  

   fourth 
  joints 
  of 
  the 
  ambulatory 
  legs 
  are 
  considerably 
  dilated 
  and 
  

   margined 
  with 
  stiff 
  setse. 
  The 
  inner 
  ramus 
  of 
  the 
  uropoda 
  is 
  much 
  

   narrower 
  than 
  in 
  C. 
  schiodtei, 
  with 
  the 
  sides 
  parallel 
  to 
  near 
  the 
  

   extremity, 
  which 
  is 
  subacute. 
  The 
  length 
  of 
  the 
  largest 
  specimen 
  

   is 
  about 
  7 
  lines 
  (15 
  millim.). 
  

  

  A 
  single 
  specimen, 
  I 
  think 
  a 
  male, 
  is 
  in 
  the 
  collection 
  from 
  Prince 
  

  

  * 
  Atlas 
  in 
  Eegne 
  Animal 
  de 
  Cuvicr, 
  Crust, 
  pi. 
  Ixvii. 
  fig. 
  8. 
  

  

  t 
  Zool. 
  Ergebu. 
  Reis. 
  roth. 
  Mecr. 
  ii. 
  p. 
  114, 
  pi. 
  viii. 
  figs. 
  7, 
  11 
  (1880). 
  

  

  