﻿37() 
  Dr, 
  T. 
  Scott 
  on 
  some 
  

  

  of 
  the 
  ceplialothorax 
  ; 
  the 
  abdomen 
  is 
  " 
  composed 
  of 
  three 
  

   segments, 
  the 
  first 
  being 
  the 
  largest. 
  The 
  antennules 
  are 
  

   very 
  short, 
  moderately 
  stout^ 
  and 
  composed 
  of 
  four 
  joints, 
  

   and 
  are 
  provided 
  with 
  tolerably 
  long 
  branching 
  setse. 
  The 
  

   natatory 
  legs 
  are 
  similar 
  to 
  those 
  in 
  M. 
  conjunctiva. 
  The 
  

   fourth 
  pair 
  (fig. 
  10), 
  which 
  have 
  both 
  rami 
  three-jointed, 
  are 
  

   provided 
  with 
  densely 
  plumose 
  setse 
  ; 
  the 
  outer 
  ramus 
  is 
  

   somewhat 
  longer 
  than 
  the 
  inner 
  and 
  has 
  a 
  short 
  seta 
  on 
  the 
  

   inner 
  margin 
  and 
  a 
  short 
  spine 
  on 
  the 
  outer 
  distal 
  angle 
  ; 
  

   there 
  is 
  also 
  a 
  short 
  spine 
  on 
  the 
  outer 
  distal 
  angle 
  of 
  the 
  

   end 
  joint 
  ; 
  the 
  marginal 
  seta 
  on 
  the 
  second 
  joint 
  and 
  those 
  

   on 
  the 
  third 
  joint 
  are 
  all 
  elongated 
  and 
  plumose, 
  except 
  that 
  

   the 
  outer 
  one 
  on 
  the 
  last 
  joint 
  differs 
  from 
  the 
  others 
  in 
  

   having 
  its 
  outer 
  edge 
  fringed 
  with 
  minute 
  spinules. 
  The 
  

   middle 
  joint 
  has 
  no 
  spine 
  exteriorly, 
  but 
  the 
  rounded 
  distal 
  

   angle 
  bears 
  a 
  few 
  small 
  bristles 
  ; 
  the 
  first 
  and 
  second 
  joints 
  

   of 
  the 
  inner 
  ramus 
  have 
  neither 
  spines 
  nor 
  setse 
  on 
  the 
  

   exterior 
  margin, 
  but 
  they 
  each 
  bear 
  a 
  long 
  plumose 
  seta 
  on 
  

   the 
  inner 
  margin, 
  and 
  five 
  similar 
  setse 
  spring 
  Irom 
  the 
  inner 
  

   margin 
  and 
  end 
  of 
  the 
  third 
  joint. 
  

  

  Tiie 
  fifth 
  pair 
  of 
  legs 
  are 
  small, 
  slightly 
  expanded, 
  and 
  

   bilobed 
  ; 
  the 
  inner 
  lobe 
  is 
  without 
  armature, 
  but 
  the 
  outer 
  

   is 
  furnished 
  with 
  three 
  setse, 
  one 
  on 
  the 
  outer 
  margin 
  and 
  

   two 
  at 
  the 
  apex 
  (fig, 
  11). 
  

  

  The 
  bifurcated 
  setiform 
  appendage, 
  which 
  springs 
  from 
  

   the 
  underside 
  of 
  the 
  genital 
  segment 
  and 
  upon 
  which 
  the 
  

   eggs 
  are 
  clustered, 
  is 
  tolerably 
  slender 
  and 
  elongated, 
  being 
  

   about 
  equal 
  to 
  the 
  entire 
  length 
  of 
  the 
  animal, 
  the 
  antennules 
  

   included. 
  The 
  caudal 
  rami 
  are 
  short 
  and 
  somewhat 
  diver- 
  

   gent 
  ; 
  they 
  are 
  each 
  provided 
  with 
  four 
  setae 
  ; 
  the 
  second 
  

   seta 
  from 
  the 
  inside 
  is 
  slender 
  and 
  only 
  of 
  moderate 
  length, 
  

   but 
  the 
  others 
  are 
  stout 
  and 
  considerably 
  elongated 
  ; 
  one 
  

   springs 
  from 
  the 
  outer 
  margin 
  and 
  the 
  others 
  from 
  the 
  apex. 
  

  

  Colour. 
  As 
  is 
  usual, 
  the 
  body 
  of 
  the 
  animal 
  is 
  of 
  a 
  reddish 
  

   colour, 
  but 
  the 
  cluster 
  of 
  eggs 
  is 
  bright 
  green 
  ; 
  the 
  size 
  of 
  

   the 
  egg-cluster 
  varies 
  in 
  different 
  individuals. 
  

  

  Hab. 
  Vicinity 
  of 
  the 
  Falklands 
  ; 
  collected 
  by 
  tow-net 
  ; 
  

   one 
  specimen 
  at 
  6 
  fathoms 
  and 
  four 
  at 
  the 
  surface. 
  

  

  Remarks. 
  Though 
  the 
  Monstrillidse 
  are 
  widely 
  distributed, 
  

   and 
  a 
  number 
  of 
  species 
  have 
  been 
  described, 
  yet 
  compara- 
  

   tively 
  few 
  of 
  them 
  appear 
  to 
  have 
  been 
  obtained 
  by 
  expe- 
  

   ditions 
  to 
  the 
  Antarctic 
  or 
  Subantarctic 
  Oceans. 
  The 
  some- 
  

   what 
  erratic 
  appearances 
  of 
  these 
  organisms 
  may 
  probably 
  

   be 
  one 
  reason 
  for 
  the 
  apparent 
  scarcity. 
  Even 
  in 
  the 
  British 
  

   seas, 
  though 
  the 
  Monstrillidse 
  are 
  usually 
  not 
  very 
  common, 
  

  

  