﻿Copepoda 
  from 
  the 
  Falkland 
  Islands. 
  9 
  

  

  This 
  Oithona 
  was 
  tolerably 
  frequent 
  in 
  all 
  the 
  three 
  marine 
  

   tow-net 
  samples 
  already 
  mentioned, 
  and 
  was 
  the 
  only 
  one 
  

   oliserved. 
  In 
  this 
  species 
  the 
  rostrum 
  is 
  short, 
  stout, 
  and 
  

   hook-lilie, 
  and 
  is 
  turned 
  downward 
  at 
  nearly 
  a 
  right 
  angle 
  

   (fig. 
  12). 
  

  

  This 
  species 
  has 
  fi-equently 
  been 
  recorded 
  under 
  the 
  name 
  

   of 
  Oithona 
  slmilis, 
  but, 
  according 
  to 
  Prof. 
  G. 
  O. 
  Sars, 
  

   O. 
  simills 
  and 
  O. 
  helgolandica 
  are 
  identical, 
  and 
  the 
  latter, 
  

   being 
  the 
  older 
  name, 
  should 
  be 
  preferred. 
  

  

  The 
  distribution 
  of 
  Oithona 
  helgolandica 
  extends 
  apparently 
  

   from 
  the 
  Arctic 
  to 
  the 
  Antarctic 
  Oceans. 
  Dr. 
  Giesbrecht 
  

   records 
  it 
  from 
  71° 
  south 
  latitude, 
  and 
  Prof. 
  G. 
  O. 
  Sars 
  has 
  

   examined 
  specimens 
  collected 
  off 
  the 
  coast 
  of 
  New 
  Zealand, 
  

   and 
  " 
  compared 
  them 
  with 
  northern 
  specimens, 
  without 
  

   being 
  able 
  to 
  detect 
  any 
  difference 
  whatever 
  ■"•" 
  *. 
  The 
  

   Falkland 
  specimens 
  measured 
  fully 
  1 
  mm. 
  in 
  length. 
  

  

  Fam, 
  Cyclopidae. 
  

   Genus 
  Cyclops, 
  Miiller, 
  1776 
  (part.). 
  

  

  Cyclops 
  2}rasinus, 
  Fischer. 
  (PI. 
  II. 
  figs. 
  5-7.) 
  

  

  1860. 
  Cyclo2)s 
  prasinus^Y'xiichi^v, 
  Beitr. 
  z. 
  Kenntn. 
  d. 
  Entomostraceen, 
  

   pp. 
  652-t)o4; 
  Taf. 
  xx. 
  tigs. 
  19-2(J 
  a. 
  

  

  This 
  species 
  occurred 
  very 
  sparingly 
  in 
  a 
  gathering 
  from 
  

   a 
  small 
  fresh-water 
  })ond 
  near 
  the 
  sea. 
  Besides 
  the 
  northern 
  

   distribution 
  of 
  the 
  species, 
  it 
  has 
  also 
  been 
  reported 
  from 
  

   Valdivia, 
  Chile, 
  and 
  from 
  the 
  Argentine. 
  In 
  this 
  species 
  the 
  

   antennules 
  are 
  twelve-jointed 
  and 
  the 
  fifth 
  pair 
  of 
  legs 
  in 
  the 
  

   female 
  are 
  each 
  provided 
  with 
  three 
  elongated 
  setse 
  (fig. 
  6). 
  

   The 
  caudal 
  segments 
  are 
  tolerably 
  short 
  (fig. 
  7). 
  

  

  Cyclops 
  michaelseni, 
  INIrazek, 
  var.falklandi. 
  

   (PI. 
  I. 
  fig. 
  3 
  ; 
  PI. 
  II. 
  figs, 
  8, 
  9.) 
  

  

  The 
  small 
  Cyclops 
  recorded 
  under 
  this 
  name 
  occurred 
  in 
  

   several 
  of 
  the 
  fresh-water 
  gatherings 
  from 
  the 
  Falldands. 
  

  

  This 
  form 
  is 
  apparently 
  identical 
  with 
  Cyclops 
  michaelseni, 
  

   Mrazek, 
  except 
  in 
  the 
  structure 
  of 
  the 
  last 
  pair 
  of 
  thoracic 
  

   legs, 
  and 
  in 
  this 
  respect 
  it 
  agrees 
  better 
  with 
  Cyclops 
  lobii- 
  

   losus, 
  Ekman. 
  In 
  that 
  species, 
  however, 
  the 
  antennules 
  are 
  

   described 
  as 
  consisting 
  of 
  twelve 
  joints, 
  and 
  the 
  proportional 
  

   lengths 
  of 
  the 
  various 
  joints 
  also 
  ditier. 
  Both 
  Cyclops 
  

   michaelseni, 
  Mrazek, 
  and 
  Cyclops 
  lobulosus, 
  Ekman, 
  have 
  

   already 
  been 
  recorded 
  for 
  the 
  Falkland 
  Islands. 
  In 
  the 
  

  

  * 
  ' 
  Crustacea 
  of 
  Norway,' 
  vol. 
  vi. 
  parts 
  1 
  & 
  2, 
  p. 
  9 
  (1913). 
  

  

  