﻿CRtrSTACEA. 
  305 
  

  

  in 
  some 
  of 
  its 
  characters 
  to 
  conuect 
  this 
  genus 
  with 
  Cirolana 
  ; 
  it 
  is 
  at 
  

   once 
  distinguished 
  from 
  R. 
  orientalis 
  by 
  the 
  form 
  of 
  the 
  eyes, 
  which 
  

   are 
  confluent 
  in 
  the 
  middle 
  line 
  of 
  the 
  head. 
  Specimens 
  are 
  in 
  the 
  

   British-Museum 
  collection 
  from 
  the 
  north-eastern 
  coast 
  of 
  Australia, 
  

   but 
  no 
  special 
  indication 
  of 
  locality 
  remains, 
  nor 
  any 
  record 
  as 
  to 
  

   how 
  they 
  were 
  obtained. 
  

  

  In 
  Dr. 
  Coppingcr's 
  specimen, 
  and 
  in 
  that 
  from 
  the 
  Gulf 
  of 
  Suez, 
  

   the 
  front 
  is 
  somewhat 
  more 
  broadly 
  rounded 
  than 
  in 
  the 
  figure 
  of 
  

   Schiodte 
  and 
  Meinert- 
  (Nat. 
  Tidsskr. 
  p. 
  395, 
  pi. 
  xiii. 
  figs. 
  1-2, 
  1879). 
  

   In 
  the 
  smaller 
  specimens 
  from 
  Ceylon 
  the 
  antennae 
  have 
  a 
  fewer 
  

   (10-12) 
  jointed 
  flagellum. 
  I 
  doubt 
  therefore 
  the 
  constancy 
  of 
  the 
  

   number 
  of 
  the 
  joints 
  of 
  the 
  autennal 
  flagellum 
  as 
  a 
  character 
  for 
  

   separating 
  the 
  species 
  ; 
  but 
  not 
  having 
  examined 
  specimens 
  of 
  several 
  

   of 
  the 
  new 
  forms 
  described 
  by 
  Schiodte 
  and 
  Meinert, 
  I 
  will 
  not 
  

   express 
  myself 
  upon 
  this 
  point 
  with 
  certainty. 
  

  

  There 
  is 
  in 
  the 
  British-Museum 
  collection 
  a 
  species 
  of 
  ^ga 
  very 
  

   nearly 
  allied 
  to 
  ^c/a 
  ci/chjjs, 
  Haswell, 
  from 
  Port 
  Jackson, 
  but 
  which 
  

   seems 
  to 
  be 
  sufficiently 
  distinguished 
  by 
  having 
  the 
  body 
  very 
  coarsely 
  

   punctulatcd, 
  the 
  epimera 
  of 
  the 
  fourth 
  to 
  seventh 
  segments 
  only 
  sub- 
  

   acute 
  and 
  (the 
  last 
  excepted) 
  scarcely 
  prolonged 
  beyond 
  the 
  posterior 
  

   margin 
  of 
  the 
  segments 
  ; 
  and 
  particularly 
  bj' 
  the 
  form 
  of 
  the 
  ter- 
  

   minal 
  postabdominal 
  segment, 
  which 
  is 
  truncated, 
  not 
  rounded, 
  at 
  its 
  

   distal 
  extremity 
  ; 
  the 
  outer 
  ramus 
  of 
  the 
  iiropoda 
  is 
  ovate 
  but 
  not 
  

   acute, 
  the 
  inner 
  squarely 
  truncated 
  at 
  its 
  distal 
  extremity 
  ; 
  the 
  distal 
  

   process 
  of 
  the 
  peduncle 
  extends 
  considerably 
  beyond 
  the 
  middle 
  of 
  

   the 
  inner 
  ramus. 
  This 
  species, 
  of 
  which 
  a 
  single 
  male 
  is 
  in 
  the 
  col- 
  

   lection 
  from 
  King 
  George's 
  Sound 
  (i^. 
  il/, 
  i?ft?/}?er, 
  H.M.S. 
  ' 
  Herald'), 
  

   I 
  propose 
  to 
  designate 
  ^f/a 
  meinerti. 
  In 
  the 
  confluent 
  eyes 
  

   and 
  the 
  form 
  of 
  the 
  terminal 
  segment 
  it 
  somewhat 
  resembles 
  

   the 
  North-European 
  and 
  Arctic 
  ^ga 
  crenulata, 
  Liitken, 
  but 
  the 
  

   posterior 
  prehensile 
  limbs 
  are 
  without 
  the 
  cultriform 
  process 
  charac- 
  

   teristic 
  of 
  that 
  species 
  and 
  ^rja 
  ivthhii. 
  

  

  8. 
  Cymodocea 
  longistylis. 
  (Plate 
  XXXIII. 
  fig. 
  C.) 
  

  

  Convex 
  oblong-ovate, 
  as 
  usual 
  in 
  the 
  genus. 
  Head 
  and 
  first 
  three 
  

   segments 
  of 
  the 
  body 
  indistinctly 
  punctulated 
  ; 
  the 
  fourth 
  to 
  seventh 
  

   segments 
  granulated, 
  the 
  granules 
  arranged 
  in 
  two 
  transverse 
  series, 
  

   and 
  most 
  distinct 
  on 
  the 
  two 
  posterior 
  segments. 
  First 
  segment 
  of 
  

   the 
  postabdomen 
  with 
  a 
  transverse 
  line 
  of 
  granules 
  (like 
  those 
  of 
  the 
  

   thoracic 
  segments, 
  but 
  larger) 
  and 
  with 
  other 
  granules 
  posterior 
  to 
  

   it, 
  and 
  with 
  a 
  prominence 
  on 
  either 
  side 
  of 
  the 
  middle 
  line 
  on 
  its 
  

   posterior 
  margin 
  : 
  terminal 
  segment 
  also 
  very 
  distinctly 
  granulated 
  

   and 
  somewhat 
  hairy, 
  and 
  with 
  two 
  elevated 
  prominences 
  on 
  its 
  

   upper 
  surface, 
  behind 
  which, 
  and 
  near 
  to 
  the 
  distal 
  extremity, 
  is 
  a 
  

   much 
  less 
  elevated 
  and 
  more 
  rounded 
  prominence 
  ; 
  terminal 
  notch 
  

   quadrangular, 
  and 
  with 
  an 
  oblong 
  distally 
  truncated 
  median 
  lobe. 
  

   The 
  median 
  frontal 
  process 
  is 
  subtriangulate 
  ; 
  the 
  postero-lateral 
  

   angles 
  of 
  all 
  the 
  segments 
  of 
  the 
  body 
  are 
  acute, 
  except 
  those 
  of 
  the 
  

  

  X 
  

  

  