﻿258 
  Transactions. 
  — 
  Zoologij. 
  

  

  Fam. 
  I. 
  CyclopidEe. 
  

   Head 
  consolidated 
  with 
  thorax 
  ; 
  foot-jaws 
  two 
  pairs, 
  generally 
  small 
  ; 
  

   fifth 
  pair 
  of 
  legs 
  rudimentary 
  ; 
  eye 
  single 
  ; 
  both 
  of 
  the 
  superior 
  antennaB 
  in 
  

   the 
  male 
  furnished 
  with 
  a 
  swollen 
  hinge-joint. 
  

  

  Genus 
  I. 
  Cyclops, 
  Midler. 
  Fig. 
  D.2 
  a-l. 
  

   Foot-jaws 
  large 
  and 
  strong, 
  branched 
  ; 
  inferior 
  antenna 
  simple 
  ; 
  

   external 
  ovaries 
  two. 
  

  

  1. 
  Cyclops 
  novcB-zealanclice 
  , 
  nov. 
  sp. 
  

  

  Female, 
  — 
  Cephalothorax 
  greatly 
  exceeding 
  in 
  length 
  the 
  three 
  following 
  

   segments, 
  produced 
  downwards 
  in 
  front 
  into 
  an 
  obtuse 
  beak. 
  All 
  the 
  body 
  

   segments 
  rounded 
  on 
  then- 
  postero-lateral 
  margins 
  ; 
  segments 
  of 
  the 
  

   abdomen 
  slightly 
  produced 
  posteriorly 
  above 
  and 
  below, 
  last 
  segment 
  with 
  

   the 
  whole 
  posterior 
  margin 
  finely 
  serrated. 
  Superior 
  antenna 
  fourteen- 
  

   jointed 
  ; 
  last 
  five 
  articulations 
  long 
  and 
  slender. 
  Each 
  joint 
  furnished 
  with 
  

   one 
  or 
  more 
  set^e, 
  which 
  are 
  most 
  abundant 
  on 
  the 
  basal 
  joints 
  ; 
  terminal 
  

   joint 
  with 
  one 
  long 
  and 
  four 
  shorter 
  setse. 
  Inferior 
  antennae 
  four-jointed 
  ; 
  

   first 
  joint 
  bearing 
  at 
  its 
  extremity 
  a 
  long 
  plumose 
  seta, 
  which 
  exceeds 
  the 
  

   rest 
  of 
  the 
  antenna 
  in 
  length 
  ; 
  second 
  nearly 
  smooth 
  ; 
  third 
  with 
  the 
  inferior 
  

   margin 
  sinuously 
  curved 
  and 
  bearing 
  about 
  eight 
  setse 
  ; 
  last 
  joint 
  terminated 
  

   by 
  seven 
  unequal 
  sette. 
  Mouth 
  organs 
  as 
  in 
  C. 
  quadricornis. 
  Last 
  pak 
  of 
  

   legs 
  two-jointed 
  ; 
  basal 
  joint 
  very 
  short 
  ; 
  second 
  sub 
  -triangular 
  in 
  shape 
  

   and 
  bearing 
  three 
  setse, 
  the 
  longest 
  of 
  which 
  is 
  plumose. 
  Caudal 
  lamellae 
  

   about 
  four 
  times 
  as 
  long 
  as 
  broad, 
  with 
  a 
  line 
  of 
  serrations 
  down 
  the 
  outer 
  

   margins. 
  Set^ 
  sparingly 
  ciliated 
  near 
  the 
  base, 
  but 
  becoming 
  beautifully 
  

   plumose 
  towards 
  the 
  middle 
  and 
  extremities 
  ; 
  inner 
  seta 
  longer 
  than 
  the 
  

   abdomen, 
  about 
  eight 
  times 
  as 
  long 
  as 
  the 
  lamellse 
  ; 
  outer 
  seta 
  about 
  five 
  

   times 
  as 
  long 
  as 
  lamellae 
  ; 
  a 
  short-toothed 
  seta 
  on 
  the 
  outer 
  margin 
  at 
  the 
  

   extremity 
  ; 
  two 
  more 
  on 
  the 
  inner 
  margin. 
  Ovaries 
  usually 
  of 
  a 
  slate 
  blue 
  

   colour, 
  broadly 
  oval, 
  only 
  about 
  half 
  as 
  long 
  as 
  the 
  abdomen, 
  and 
  diverging 
  

   somewhat 
  widely 
  from 
  it. 
  

  

  Male. 
  — 
  Smaller 
  than 
  the 
  female 
  and 
  more 
  active, 
  similar 
  in 
  shape, 
  but 
  

   readily 
  distinguished 
  by 
  the 
  shape 
  of 
  the 
  superior 
  antennae. 
  These 
  have 
  

   the 
  joints 
  much 
  more 
  crowded 
  together, 
  and 
  very 
  flexible. 
  Antepenultimate 
  

   joint 
  not 
  setiferous; 
  ultimate 
  joint 
  having 
  about 
  eight 
  setae 
  on 
  one 
  side, 
  the 
  

   last 
  (and 
  longest) 
  being 
  somewhat 
  removed 
  from 
  the 
  smooth 
  extremity. 
  

   These 
  last 
  two 
  joints 
  have 
  an 
  extremely 
  flexible 
  hinge, 
  and 
  can 
  be 
  bent 
  

   completely 
  back 
  so 
  as 
  to 
  lie 
  against 
  the 
  preceding 
  joints. 
  Fifth 
  pair 
  of 
  legs 
  

   as 
  in 
  the 
  female. 
  

  

  Colour 
  usually 
  yellowish 
  and 
  semi-transparent, 
  with 
  numerous 
  red 
  or 
  

   j^rowu 
  oil 
  globules; 
  sometimes 
  so 
  encrusted 
  with 
  diatoms 
  and 
  coufervoid 
  

  

  