﻿372 
  Dr. 
  T. 
  Scott 
  on 
  some 
  

  

  G. 
  S. 
  Brady, 
  from 
  the 
  German 
  South 
  Polar 
  Expedition, 
  

   1901-1903j 
  but 
  differs 
  in 
  the 
  structure 
  of 
  the 
  antennules, 
  

   the 
  second 
  maxillipeds, 
  and, 
  to 
  a 
  small 
  extent, 
  in 
  the 
  form 
  

   of 
  the 
  fifth 
  pair 
  of 
  legs. 
  It 
  appears 
  also 
  to 
  be 
  nearly 
  allied 
  

   to 
  Tisbe 
  ausirina, 
  Scott, 
  from 
  Scotia 
  Bay, 
  South 
  Orkneys, 
  

   hut 
  the 
  end 
  joint 
  of 
  the 
  fifth 
  pair 
  of 
  legs 
  is 
  proportionally 
  

   narrower. 
  No 
  males 
  were 
  observed. 
  

  

  Genus 
  Aspidiscus, 
  Norman, 
  1868. 
  

   Aspidiscus 
  australis^ 
  sp. 
  n. 
  (PI. 
  XIV. 
  figs. 
  1-5.) 
  

  

  Female. 
  — 
  The 
  antennules 
  are 
  composed 
  of 
  nine 
  articula- 
  

   tions 
  ; 
  the 
  first 
  three 
  are 
  tolerably 
  stout 
  and 
  elongated, 
  the 
  

   fourth 
  is 
  also 
  moderately 
  stout, 
  but 
  is 
  little 
  more 
  than 
  half 
  

   the 
  length 
  of 
  the 
  third 
  ; 
  the 
  remaining 
  joints 
  are 
  narrow 
  and. 
  

   short, 
  except 
  the 
  end 
  one, 
  which 
  is 
  moderately 
  elongated, 
  as 
  

   shown 
  in 
  the 
  drawing 
  (fig. 
  1). 
  The 
  formula 
  shows 
  approxi- 
  

   mately 
  the 
  proportional 
  lengths 
  of 
  the 
  various 
  joints 
  : 
  — 
  

  

  1.2.3.4.5.6.7.8. 
  9 
  

   12 
  15 
  13 
  7 
  4 
  2 
  4 
  5 
  11' 
  

  

  The 
  antennse 
  and 
  mouth-appendages 
  are 
  somewhat 
  like 
  

   those 
  of 
  A. 
  littoralis, 
  G. 
  O. 
  Sars 
  ; 
  the 
  second 
  maxillipeds 
  are 
  

   small 
  (fig. 
  2). 
  In 
  the 
  first 
  pair 
  of 
  thoracic 
  legs 
  the 
  first 
  

   joint 
  of 
  the 
  inner 
  ramus 
  is 
  tolerably 
  large 
  and 
  expanded 
  

   interiorly 
  at 
  the 
  proximal 
  end 
  ; 
  the 
  second 
  and 
  third 
  joints 
  

   are 
  small, 
  and 
  the 
  latter 
  is 
  provided 
  with 
  two 
  short 
  claws 
  

   fimbriated 
  on 
  the 
  lower 
  margin 
  ; 
  the 
  outer 
  ramus 
  is 
  shorter 
  

   than 
  the 
  inner 
  and 
  composed 
  of 
  three 
  joints, 
  the 
  end 
  one 
  

   being 
  small 
  (fig. 
  3). 
  Other 
  natatory 
  legs 
  somewhat 
  similar 
  

   to 
  those 
  in 
  the 
  species 
  mentioned 
  above. 
  Fifth 
  pair 
  with 
  

   the 
  end 
  joint 
  tolerably 
  large 
  and 
  lamelliform 
  ; 
  its 
  width 
  is 
  

   about 
  equal 
  to 
  half 
  the 
  length, 
  and 
  its 
  distal 
  end 
  is 
  truncated 
  

   and 
  provided 
  with 
  three 
  moderately 
  stout 
  and 
  elongated 
  

   setse 
  (fig. 
  4). 
  The 
  caudal 
  rami 
  are 
  short. 
  

  

  Length 
  '84 
  mm 
  (about 
  r^o 
  of 
  an 
  inch). 
  

  

  No 
  males 
  were 
  observed. 
  

  

  Three 
  specimens 
  of 
  this 
  Aspidiscus 
  occurred 
  in 
  a 
  small 
  

   tow-net 
  gathering 
  collected 
  in 
  the 
  vicinity 
  of 
  the 
  Falkland 
  

   Islands 
  in 
  Nov. 
  1909. 
  

  

  Fam. 
  Thalestridae. 
  

   Genus 
  Pseudothalestris, 
  Brady, 
  1883. 
  

   Fseudothalestris 
  nana, 
  sp. 
  n. 
  (PI. 
  XV. 
  figs. 
  1-11.) 
  

   7r'^/,i^//f.._Cephalothorax 
  stout, 
  dorsum 
  boldly 
  arcuate, 
  

  

  