﻿244 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  margins. 
  The 
  two 
  anterior 
  leg-bearing 
  segments 
  separated 
  from 
  

   the 
  remainder 
  by 
  portions 
  of 
  a 
  groove, 
  extending 
  inward 
  from 
  each 
  

   lateral 
  margin. 
  Fifth 
  segment 
  bearing 
  a 
  good-sized 
  hemispherical 
  

   knob 
  on 
  its 
  posterior 
  border 
  on 
  either 
  side, 
  just 
  external 
  to 
  the 
  open- 
  

   ing 
  of 
  the 
  oviduct. 
  The 
  location 
  of 
  these 
  knobs, 
  combined 
  with 
  the 
  

   position 
  in 
  which 
  the 
  egg-strings 
  are 
  habitually 
  carried, 
  suggests 
  

   strongly 
  that 
  tliey 
  are 
  concerned 
  in 
  the 
  support 
  of 
  the 
  latter. 
  Sixtli 
  

   (genital) 
  segment 
  indistinguishably 
  fused 
  with 
  the 
  abdomen, 
  the 
  two 
  

   forming 
  a 
  triangular 
  projection, 
  one-half 
  wider 
  than 
  long, 
  attached 
  

   to 
  the 
  center 
  of 
  the 
  posterior 
  border 
  of 
  the 
  fifth 
  segment, 
  between 
  

   the 
  two 
  knobs. 
  The 
  oviduct 
  openings 
  are 
  dorsolateral, 
  and 
  as 
  close 
  

   as 
  possible 
  to 
  the 
  fifth 
  segment. 
  Anal 
  laminae 
  conical, 
  twice 
  as 
  long 
  

   as 
  wide, 
  half 
  the 
  length 
  of 
  the 
  fused 
  sixth 
  segment 
  and 
  abdomen, 
  

   each 
  tipped 
  with 
  three 
  setae 
  of 
  equal 
  length, 
  and 
  having 
  a 
  short 
  

   spine 
  on 
  the 
  outer 
  margin. 
  

  

  Egg-strings 
  each 
  one-third 
  the 
  width 
  of 
  the 
  fused 
  thorax 
  and 
  two- 
  

   thirds 
  of 
  its 
  length; 
  eggs 
  remarkably 
  large 
  compared 
  with 
  the 
  size 
  

   of 
  the 
  animal, 
  only 
  four 
  or 
  five 
  in 
  each 
  case. 
  The 
  two 
  cases 
  are 
  ro- 
  

   tated 
  until, 
  "with 
  their 
  bases 
  touching 
  at 
  the 
  midline, 
  they 
  are 
  carried 
  

   in 
  front 
  of 
  a 
  line 
  at 
  right 
  angles 
  to 
  the 
  body 
  axis, 
  and 
  are 
  actually 
  

   curved 
  forward 
  like 
  the 
  points 
  of 
  a 
  pickax, 
  or 
  even 
  as 
  far 
  as 
  the 
  

   flukes 
  of 
  an 
  anchor. 
  

  

  F'irst 
  antennas 
  indistinctly 
  five-jointed, 
  the 
  same 
  diameter 
  tlu'ough- 
  

   out, 
  only 
  the 
  three 
  terminal 
  joints 
  armed 
  with 
  setae; 
  they 
  are 
  usually 
  

   closely 
  appressed 
  to 
  the 
  lateral 
  margins 
  of 
  the 
  carapace. 
  Second 
  

   antennae 
  with 
  a 
  stout 
  basal 
  joint, 
  which 
  is 
  contracted 
  and 
  curved 
  

   inward 
  at 
  the 
  distal 
  end; 
  terminal 
  claw 
  short, 
  stout, 
  and 
  evenly 
  

   curved. 
  Mouth 
  tube 
  short, 
  scarcely 
  as 
  long 
  as 
  wide, 
  with 
  a 
  blunt 
  tip; 
  

   maxillae 
  reduced 
  to 
  mere 
  knobs, 
  destitute 
  of 
  spines 
  or 
  setae. 
  Maxil- 
  

   lipeds 
  with 
  the 
  two 
  terminal 
  joints 
  together 
  the 
  same 
  length 
  as 
  the 
  

   basal 
  joint, 
  but 
  only 
  half 
  the 
  width 
  of 
  the 
  latter. 
  Swimming 
  legs 
  

   biramose, 
  each 
  ramus 
  two-jointed; 
  in 
  the 
  exopods 
  the 
  basal 
  joint 
  is 
  

   the 
  longer, 
  in 
  the 
  endopods 
  the 
  terminal 
  joint. 
  In 
  the 
  first 
  legs 
  the 
  

   basal 
  joints 
  are 
  unarmed, 
  the 
  terminal 
  endopod 
  joint 
  carries 
  four 
  

   short 
  spines, 
  the 
  exopod 
  three. 
  In 
  the 
  second 
  legs 
  each 
  basal 
  joint 
  

   is 
  armed 
  with 
  a 
  curved 
  spine, 
  on 
  the 
  outside 
  in 
  the 
  exopod, 
  on 
  the 
  

   inside 
  in 
  the 
  endopod; 
  the 
  terminal 
  exopod 
  jojint 
  carries 
  two 
  curved 
  

   spines, 
  the 
  endopod 
  three. 
  

  

  Color 
  variegated, 
  the 
  lateral 
  margins 
  a 
  light 
  olive-green, 
  the 
  ovaries 
  

   and 
  oviducts 
  a 
  light 
  cinnamon-brown, 
  the 
  vascular 
  space 
  between 
  the 
  

   oviducts 
  and 
  intestine 
  orange-j^ellow, 
  the 
  stomach 
  and 
  intestine 
  con- 
  

   tents 
  a 
  dark 
  wine-red, 
  filled 
  with 
  black 
  globules 
  along 
  the 
  center, 
  

   which 
  are 
  most 
  numerous 
  at 
  the 
  anterior 
  end. 
  

  

  Total 
  length, 
  1 
  mm. 
  Carapace, 
  0.31 
  mm. 
  long, 
  0.4 
  mm. 
  wide. 
  

   Fused 
  thorax, 
  0.7 
  mm. 
  long, 
  0.55 
  mm. 
  wide. 
  Egg-strings, 
  0.45 
  mm. 
  

   long, 
  0.15 
  mm. 
  wide. 
  

  

  