﻿G. 
  M. 
  Thomson. 
  — 
  On 
  the 
  New 
  Zealand 
  Entomostraca. 
  257 
  

  

  1. 
  Philomedes 
  agilis, 
  nov. 
  sp. 
  Fig. 
  C.3 
  a-e, 
  and 
  D.l 
  a-g. 
  

  

  Male. 
  — 
  Valves, 
  when 
  viewed 
  from 
  the 
  side, 
  oblong; 
  greatest 
  height 
  about 
  

   two-thirds 
  of 
  the 
  length, 
  obtusely 
  rounded 
  posteriorly, 
  beak 
  not 
  greatly 
  pro- 
  

   duced 
  anteriorly; 
  superior 
  and 
  inferior 
  margins 
  evenly 
  and 
  slightly 
  arched; 
  

   oral 
  notch 
  wide, 
  margins 
  more 
  or 
  less 
  setose. 
  AVhen 
  viewed 
  from 
  above 
  the 
  

   valves 
  are 
  narrow, 
  sides 
  nearly 
  parallel, 
  almost 
  truncate 
  posteriorly, 
  tapering 
  

   to 
  an 
  obtuse 
  point 
  in 
  front. 
  Surface 
  marked 
  with 
  numerous 
  circular 
  pits, 
  

   and 
  several 
  translucent 
  spots 
  in 
  the 
  centre 
  of 
  each 
  valve. 
  Behind 
  each 
  

   prominent 
  eye-spot, 
  is 
  a 
  more 
  or 
  less 
  deep 
  transverse 
  sinus 
  or 
  depression, 
  

   extending 
  nearly 
  across 
  the 
  whole 
  valve. 
  Colour 
  of 
  shell 
  yellowish-brown. 
  

   Terminal 
  setffi 
  of 
  upper 
  antennae 
  nearly 
  half 
  as 
  long 
  as 
  the 
  antennae 
  itself. 
  

   Natatory 
  branch 
  of 
  inferior 
  antennse 
  (exclusive 
  of 
  setfe) 
  exceeding 
  in 
  length 
  

   the 
  basal 
  portion, 
  second 
  joint 
  very 
  short, 
  bearing 
  a 
  straight 
  plumose 
  seta, 
  

   equal 
  in 
  length 
  to 
  the 
  third 
  joint, 
  which 
  again 
  is 
  longer 
  than 
  the 
  next 
  six 
  

   joints 
  ; 
  terminal 
  setfe 
  about 
  as 
  long 
  as 
  the 
  branch 
  itself. 
  Secondary 
  branch 
  

   with 
  the 
  basal 
  joint 
  short 
  and 
  stout, 
  bearing 
  short 
  plumose 
  set^ 
  ; 
  second 
  

   and 
  third 
  joints 
  subequal, 
  former 
  with 
  two 
  setse 
  in 
  the 
  middle 
  of 
  external 
  

   margin, 
  latter 
  curved, 
  external 
  margin 
  denticulate 
  and 
  with 
  a 
  single 
  seta 
  on 
  

   its 
  inner 
  margin 
  near 
  the 
  base. 
  Last 
  joint 
  of 
  mandibular 
  foot 
  slender, 
  

   twice 
  as 
  long 
  as 
  preceding, 
  terminal 
  claw 
  subequal 
  to 
  it 
  ; 
  all 
  the 
  joints 
  

   bearing 
  several 
  plumose 
  setse. 
  "Oviferous 
  feet" 
  terminating 
  in 
  a 
  vermi- 
  

   form 
  toothed 
  extremity, 
  bearing 
  a 
  pair 
  of 
  long 
  spinose 
  set^e 
  above 
  and 
  

   three 
  beneath 
  ; 
  about 
  five 
  pairs 
  of 
  shorter 
  spinose 
  setse 
  on 
  the 
  annulated 
  

   portion 
  near 
  the 
  extremity. 
  Post-abdominal 
  laminas 
  terminated 
  by 
  three 
  

   large 
  jointed 
  and 
  doubly-serrated 
  claws, 
  — 
  the 
  first 
  very 
  long, 
  second 
  only 
  

   half 
  as 
  long, 
  and 
  third 
  about 
  half 
  as 
  long 
  as 
  second, 
  — 
  and 
  about 
  five 
  

   smaller 
  spines. 
  Eyes 
  large 
  black. 
  

  

  Female. 
  — 
  Valves 
  somewhat 
  larger, 
  and 
  much 
  more 
  circular 
  in 
  outline, 
  

   with 
  the 
  beak 
  small 
  and 
  very 
  slightly 
  produced 
  ; 
  oral 
  notch 
  nearly 
  rectangu- 
  

   lar 
  ; 
  height 
  about 
  three-fourths 
  of 
  the 
  length; 
  easily 
  distinguished 
  externally 
  

   fi'om 
  the 
  male 
  by 
  the 
  small 
  size 
  of 
  the 
  eye-spot. 
  Superior 
  antennae 
  with 
  

   the 
  setse 
  at 
  the 
  extremity 
  of 
  the 
  antepenultimate 
  joint 
  beautifully 
  plumose. 
  

   Natatory 
  branch 
  of 
  the 
  inferior 
  antennae 
  with 
  the 
  first 
  joint 
  very 
  long 
  ; 
  all 
  

   the 
  rest 
  short 
  and 
  subequal 
  ; 
  no 
  setEe 
  on 
  the 
  first 
  three 
  joints, 
  those 
  on 
  the 
  

   fourth, 
  fifth, 
  and 
  sixth 
  joints 
  about 
  as 
  long 
  as 
  the 
  basal 
  joint 
  and 
  bluntly 
  

   toothed 
  ; 
  the 
  remainder 
  (seven 
  in 
  number) 
  very 
  long 
  and 
  densely 
  plumose 
  ; 
  

   secondary 
  branch 
  rudimentary, 
  with 
  a 
  few 
  small 
  setge. 
  Eyes 
  reddish. 
  

  

  Length 
  -^^ 
  inch 
  ; 
  height 
  Jj- 
  inch. 
  

  

  Swimming 
  actively 
  in 
  rock 
  pools 
  on 
  the 
  Taieri 
  Beach. 
  

   Order 
  II. 
  Copepoda. 
  

  

  Shell 
  jointed, 
  forming 
  a 
  buckler 
  enclosing 
  the 
  head 
  and 
  tlioras 
  ; 
  legs 
  

   five 
  pairs, 
  mostly 
  adapted 
  for 
  swimming 
  ; 
  ovary 
  external. 
  

  

  A3 
  

  

  