﻿474 
  Mr. 
  G. 
  P. 
  Fanan 
  on 
  a 
  Harpact'icid 
  Copepod 
  

  

  M;indible 
  (fig. 
  4) 
  with 
  a 
  strong- 
  thvee-tootlied 
  cutting- 
  

   blade; 
  |)alp 
  very 
  small, 
  nnbranclied, 
  with 
  four 
  set£e. 
  

  

  First 
  maxilla 
  (tig. 
  5) 
  appears 
  to 
  consist 
  of 
  a 
  flattened 
  plate 
  

   with 
  a 
  curved 
  point 
  ; 
  no 
  seta? 
  or 
  lobes 
  could 
  be 
  made 
  out, 
  

   but 
  they 
  may 
  have 
  escaped 
  notice. 
  

  

  Second 
  inaxiila 
  (fig. 
  6) 
  two-jointed, 
  cheliform, 
  the 
  claw 
  

   finely 
  denticuhited 
  on 
  the 
  inner 
  edge. 
  

  

  Maxillipede 
  (fig. 
  7) 
  with 
  basal 
  joint 
  and 
  chela 
  as 
  in 
  the 
  

   second 
  maxilla, 
  but 
  with 
  a 
  stronger 
  and 
  sharper 
  claw 
  and 
  a 
  

   more 
  muscular 
  basal 
  joint. 
  

  

  First 
  foot 
  (fig. 
  8) 
  ver}' 
  small 
  and 
  feebly 
  chitinized. 
  It 
  is 
  

   of 
  the 
  same 
  stiucture 
  as 
  in 
  the 
  genus 
  Idya, 
  and 
  the 
  muscula- 
  

   ture 
  of 
  the 
  exopodite 
  is 
  well 
  developed. 
  The 
  length 
  of 
  the 
  

   first 
  foot 
  in 
  Idya 
  furcaia 
  is 
  about 
  two-fifths 
  of 
  the 
  total 
  length 
  

   of 
  the 
  animal 
  ; 
  in 
  the 
  present 
  species 
  it 
  is 
  about 
  one-eighth. 
  

  

  Second 
  foot 
  (fig. 
  9) 
  very 
  minute, 
  with 
  two-jointed 
  exopo- 
  

   dite 
  and 
  endopodite, 
  the 
  former 
  with 
  two 
  outer- 
  edge 
  and 
  two 
  

   terminal 
  seta3, 
  the 
  latter 
  with 
  one 
  outer-edge 
  and 
  two 
  terminal 
  

   seta?. 
  Tlie 
  muscles 
  in 
  the 
  second 
  basal 
  joint 
  which 
  move 
  the 
  

   exopodite 
  are 
  fairly 
  well 
  developed. 
  

  

  Third 
  and 
  fourth 
  feet 
  absent. 
  

  

  Fifth 
  feet 
  (fig. 
  10) 
  strongly 
  chitinized, 
  ending 
  in 
  six 
  stout 
  

   denticnlations, 
  of 
  which 
  the 
  innermost 
  bears 
  a 
  small 
  seta, 
  

   outer 
  eclye 
  with 
  one 
  seta 
  set 
  back 
  a 
  little 
  from 
  the 
  ma-rgin 
  on 
  

   the 
  posterior 
  face, 
  inner 
  edge 
  with 
  two 
  seta? 
  situated 
  close 
  

   together 
  near 
  the 
  point 
  of 
  attachment 
  of 
  the 
  foot, 
  and 
  distal 
  

   to 
  them 
  a 
  pore 
  in 
  the 
  cliitinous 
  margin 
  of 
  the 
  foot 
  which 
  

   seems 
  to 
  be 
  the 
  mouih 
  of 
  a 
  gland. 
  The 
  fifth 
  feet 
  are 
  articu- 
  

   lated 
  to 
  either 
  end 
  of 
  a 
  broad, 
  cliitinous, 
  transverse 
  ventral 
  

   plate. 
  The 
  two 
  inner-edge 
  seta^ 
  of 
  the 
  fifth 
  foot 
  of 
  this 
  

   species 
  seem 
  to 
  correspond 
  morph(dogically 
  to 
  the 
  two 
  or 
  

   three 
  setse 
  on 
  the 
  basal 
  joint 
  of 
  the 
  filth 
  foot 
  of 
  Idya, 
  the 
  two 
  

   joints 
  in 
  Cholidya 
  having 
  become 
  fused. 
  

  

  Genital 
  openings 
  (fig. 
  11) 
  as 
  in 
  the 
  genus 
  Idya, 
  except 
  

   that 
  the 
  minute 
  seta3 
  lateral 
  to 
  the 
  oviducal 
  opening 
  are 
  

   absent. 
  The 
  spermatheca 
  is 
  situated 
  a 
  short 
  distance 
  behind 
  

   the 
  oviducal 
  opening, 
  and 
  has 
  a 
  short 
  sigmoid 
  duct 
  terminating 
  

   at 
  the 
  indistinct 
  furrow, 
  which 
  marks 
  the 
  fusion 
  of 
  the 
  first 
  

   and 
  second 
  abdominal 
  segments. 
  

  

  Rami 
  of 
  furca 
  (fig. 
  12) 
  about 
  one 
  and 
  a 
  half 
  times 
  as 
  long- 
  

   as 
  broad, 
  with 
  one 
  short 
  stout 
  terminal 
  and 
  two 
  lateral 
  setae. 
  

  

  Egg-sac 
  single, 
  containing- 
  a 
  small 
  number 
  of 
  compara- 
  

   tively 
  large 
  eggs. 
  It 
  is 
  flask-shaped 
  and 
  attached 
  to 
  the 
  

   oviducal 
  opening 
  by 
  its 
  narrow 
  neck. 
  

  

  Hab. 
  Attached 
  to 
  the 
  inner 
  tace 
  of 
  the 
  arm-membrane 
  of 
  

  

  