﻿CRUSTACEA. 
  319 
  

  

  notches, 
  but 
  the 
  posterior 
  and 
  lateral 
  margins 
  of 
  the 
  third 
  segment 
  

   of 
  the 
  postabdomen 
  are 
  armed 
  with 
  a 
  series 
  of 
  small 
  spinules 
  which 
  

   do 
  not 
  extend 
  over 
  the 
  dorsal 
  surface, 
  but 
  reach 
  downward 
  to 
  the 
  

   postero-lateral 
  angles 
  ; 
  there 
  are 
  also 
  one 
  or 
  two 
  small 
  spinules 
  or 
  

   teeth 
  at 
  and 
  near 
  the 
  postero-lateral 
  angles 
  of 
  the 
  first 
  and 
  second 
  

   postabdominal 
  segments 
  ; 
  the 
  eyes 
  are 
  much 
  narrower 
  and 
  (trans- 
  

   versely) 
  longer 
  than 
  in 
  M. 
  suensis, 
  the 
  first 
  peduncular 
  joint 
  of 
  the 
  

   inferior 
  antennae 
  is 
  somewhat 
  longer 
  and 
  slenderer 
  ; 
  the 
  wrist 
  and 
  

   palm 
  of 
  the 
  first 
  legs 
  (gnathopoda) 
  are 
  much 
  more 
  hairy 
  ; 
  the 
  spine 
  

   on 
  the 
  posterior 
  surface 
  of 
  the 
  merus-joint 
  of 
  the 
  second 
  legs 
  is 
  

   much 
  shorter, 
  the 
  wrist 
  longer, 
  and 
  the 
  palm 
  perhaps 
  rather 
  more 
  

   slender 
  and 
  hairy, 
  with 
  a 
  less 
  distinctly 
  defined 
  distal 
  notch, 
  behind 
  

   as 
  well 
  as 
  in 
  front 
  of 
  which 
  are 
  one 
  or 
  two 
  small 
  teeth 
  ; 
  the 
  three 
  

   posterior 
  legs 
  are 
  slenderer, 
  with 
  the 
  distal 
  angles 
  of 
  the 
  merus- 
  

   joints 
  acute 
  but 
  not 
  prolonged 
  into 
  spines 
  ; 
  the 
  rami 
  of 
  the 
  posterior 
  

   uropoda 
  are 
  subequal, 
  but 
  much 
  longer 
  than 
  in 
  Megamcera 
  suensis 
  

   and 
  less 
  acute. 
  Colour 
  (in 
  spirit) 
  light 
  yellowish 
  brown. 
  Length 
  

   about 
  5 
  lines 
  (11 
  millim.). 
  

  

  A 
  single 
  specimen 
  was 
  obtained 
  at 
  Albany 
  Island, 
  4-5 
  fms., 
  with 
  

   the 
  preceding 
  species 
  ; 
  also 
  two 
  from 
  Prince 
  of 
  Wales 
  Channel, 
  

   7-9 
  fms. 
  ; 
  and 
  one 
  from 
  Thursday 
  Island, 
  4-5 
  fms. 
  (No. 
  165). 
  

  

  In 
  the 
  long 
  rami 
  of 
  the 
  posterior 
  uropoda 
  this 
  sjiecies 
  somewhat 
  

   resembles 
  31. 
  mastersii, 
  Haswell, 
  from 
  Port 
  Jackson 
  ; 
  from 
  which, 
  

   however, 
  it 
  is 
  distinguished 
  by 
  the 
  larger 
  narrow 
  eyes 
  and 
  the 
  

   somewhat 
  excavated 
  and 
  less 
  distinctly 
  toothed 
  distal 
  margins 
  of 
  

   the 
  palms 
  of 
  the 
  second 
  legs 
  ; 
  nor 
  does 
  Mr. 
  Haswell 
  mention 
  the 
  

   spinules 
  of 
  the 
  third 
  postabdominal 
  segment, 
  &c. 
  

  

  From 
  Mcera 
  rubromacuktta, 
  Stimpson, 
  it 
  is 
  distinguished 
  by 
  the 
  

   entire 
  non-pectinated 
  postero-dorsal 
  margins 
  of 
  the 
  postabdominal 
  

   segments, 
  the 
  narrow 
  eyes, 
  and 
  the 
  non-defined 
  distal 
  margin 
  of 
  the 
  

   palms 
  of 
  the 
  second 
  legs. 
  

  

  It 
  is 
  also 
  apparently 
  very 
  nearly 
  allied 
  to 
  the 
  British 
  Megamcera 
  

   semiserratu 
  and 
  M. 
  hrevicaudata, 
  Spence 
  Bate, 
  and 
  may 
  be 
  only 
  a 
  

   variety 
  of 
  one 
  of 
  these 
  species 
  ; 
  but 
  in 
  M. 
  semiserrata 
  the 
  eyes 
  are 
  

   represented 
  as 
  less 
  narrow 
  and 
  elongated, 
  and 
  the 
  dactyli 
  of 
  the 
  legs 
  

   of 
  the 
  second 
  pair 
  are 
  serrated 
  upon 
  the 
  inner 
  distal 
  half, 
  and 
  in 
  

   M. 
  brevicaudata 
  the 
  palm 
  has 
  the 
  inferior 
  margin 
  loss 
  distinctly 
  

   defined 
  and 
  more 
  convex 
  in 
  its 
  distal 
  portion 
  *. 
  

  

  I 
  may 
  note, 
  in 
  conclusion, 
  that 
  Kossmann 
  has 
  described 
  f 
  two 
  

   species, 
  Mcera 
  erythra-a 
  and 
  M. 
  massavensis, 
  from 
  the 
  Red 
  Sea, 
  

   which 
  appear 
  to 
  be 
  distinguished 
  from 
  all 
  the 
  foregoing 
  species 
  of 
  

   Mcera 
  and 
  Megamcera 
  by 
  the 
  form 
  of 
  the 
  palms 
  of 
  the 
  second 
  legs. 
  

  

  9. 
  Podocerus 
  australis, 
  Haswell. 
  

  

  Five 
  male 
  specimens 
  were 
  obtained 
  at 
  Port 
  Jackson 
  from 
  weed 
  

   on 
  the 
  ship's 
  bottom. 
  

  

  * 
  M. 
  semiserrafa 
  is 
  one 
  of 
  several 
  Anipbipoda 
  which 
  it 
  would 
  seem 
  are 
  inaccu 
  

   rately 
  marked 
  in 
  Mr. 
  Spence 
  Bate's 
  Catalogue 
  as 
  represented 
  in 
  tlie 
  Museum. 
  

  

  t 
  Zool. 
  Ergebn. 
  einer 
  Reise 
  im 
  roth. 
  Meeres, 
  pp. 
  132, 
  133, 
  pi. 
  xir 
  

   figs. 
  1-11 
  (1880). 
  

  

  