﻿240 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  thorax 
  elongate, 
  club-shaped, 
  the 
  wide 
  end 
  anterior, 
  with 
  nearly 
  

   straight 
  lateral 
  margins, 
  which 
  converge 
  posteriorly, 
  the 
  segmenta- 
  

   tion 
  being 
  clearly 
  indicated 
  by 
  marginal 
  indentations. 
  The 
  two 
  

   leg-bearing 
  segments 
  are 
  the 
  same 
  width 
  as 
  the 
  carapace, 
  but 
  much 
  

   narrower 
  than 
  the 
  third 
  segment, 
  thus 
  forming 
  a 
  short 
  and 
  wide 
  

   neck. 
  Third 
  segment 
  rather 
  abruptly 
  widened 
  to 
  one 
  and 
  three- 
  

   quarters 
  times 
  the 
  diameter 
  of 
  the 
  first 
  two 
  segments, 
  and 
  then, 
  

   with 
  the 
  fourth 
  and 
  fifth 
  segments 
  tapering 
  regularly 
  backward 
  to 
  

   the 
  base 
  of 
  the 
  sixth 
  segment, 
  without 
  any 
  posterior 
  lobes. 
  Sixth 
  

   segment 
  and 
  abdomen 
  semicircular, 
  one-third 
  the 
  diameter 
  of 
  the 
  

   fifth 
  segment; 
  anal 
  laminae 
  narrow 
  oblong, 
  each 
  tipped 
  with 
  two 
  

   minute 
  spines. 
  

  

  Egg-strings 
  of 
  medium 
  width 
  and 
  half 
  as 
  long 
  as 
  the 
  body; 
  eggs 
  

   large, 
  eight 
  or 
  nine 
  in 
  each 
  string. 
  

  

  First 
  antennae 
  closely 
  appressed 
  to 
  the 
  frontal 
  margin 
  of 
  the 
  cara- 
  

   pace 
  and 
  scarcely 
  reaching 
  its 
  lateral 
  margin, 
  with 
  setae 
  on 
  the 
  two 
  

   terminal 
  joints 
  only. 
  Terminal 
  claw 
  of 
  the 
  second 
  antennae 
  slender, 
  

   three-quarters 
  as 
  long 
  as 
  the 
  stout 
  triangular 
  basal 
  joint, 
  abruptly 
  

   bent 
  at 
  a 
  right 
  angle 
  near 
  its 
  base, 
  with 
  the 
  free 
  end 
  strongly 
  curved 
  

   inward. 
  Maxillae 
  present 
  as 
  minute 
  papillae 
  beside 
  the 
  mouth 
  tube, 
  

   each 
  tipped 
  with 
  three 
  tiny 
  spines. 
  The 
  two 
  terminal 
  joints 
  of 
  the 
  

   maxilliped 
  are 
  considerably 
  longer 
  than 
  the 
  moderately 
  stout 
  basal 
  

   joint; 
  the 
  terminal 
  claw 
  has 
  an 
  accessory 
  spine 
  on 
  its 
  inner 
  margm 
  

   near 
  the 
  tip. 
  The 
  swimming 
  legs 
  have 
  stout 
  basal 
  joints 
  and 
  wide 
  

   rami; 
  the 
  first 
  exopod 
  is 
  tipped 
  with 
  four 
  spines, 
  the 
  second 
  ^vith 
  

   three, 
  and 
  each 
  endopod 
  with 
  five; 
  there 
  is 
  a 
  long 
  and 
  stout 
  spine 
  

   on 
  the 
  basal 
  joint 
  of 
  the 
  first 
  legs, 
  inside 
  of 
  the 
  endopod, 
  and 
  a 
  much 
  

   smaller 
  one 
  in 
  a 
  similar 
  position 
  on 
  the 
  second 
  legs. 
  

  

  Color 
  a 
  light 
  lemon-yellow, 
  the 
  lacunae 
  filled 
  with 
  bright 
  red 
  blood 
  ; 
  

   these 
  lacunae 
  are 
  thickest 
  along 
  the 
  lateral 
  margms, 
  givhig 
  them 
  a 
  

   bright 
  orange 
  color, 
  with 
  an 
  irregular 
  red 
  line 
  through 
  it; 
  this 
  red 
  

   line 
  widens 
  at 
  the 
  anterior 
  and 
  posterior 
  ends 
  of 
  the 
  oviducts. 
  The 
  

   muscles 
  of 
  the 
  head 
  and 
  the 
  first 
  two 
  thorax 
  segments 
  are 
  also 
  bright 
  

   red 
  ; 
  the 
  oviducts 
  and 
  freshly 
  extruded 
  eggs 
  are 
  snow-white. 
  

  

  Total 
  length, 
  1.75 
  mm. 
  Carapace, 
  0.32 
  mm. 
  wide, 
  0.25 
  mm. 
  long. 
  

   Fused 
  thorax, 
  1.42 
  mm. 
  long; 
  third 
  segment, 
  0,5 
  mm. 
  mde. 
  

  

  (albiruhra,'albus, 
  white, 
  and 
  ruber, 
  red.) 
  

  

  This 
  species 
  most 
  resembles 
  H. 
  oblonga 
  (see 
  p. 
  242) 
  from 
  the 
  red 
  

   snapper, 
  but 
  it 
  may 
  be 
  easily 
  distinguished 
  by 
  the 
  fact 
  that 
  the 
  

   carapace 
  is 
  much 
  narrower 
  than 
  the 
  fused 
  thorax, 
  wliile 
  the 
  latter 
  is 
  

   much 
  wider 
  anteriorly 
  than 
  posteriorly. 
  Again, 
  the 
  rich 
  pink-red 
  

   color 
  of 
  the 
  present 
  species 
  and 
  the 
  snow-white 
  ovaries 
  and 
  oviducts 
  

   form 
  a 
  striking 
  contrast 
  not 
  known 
  to 
  occur 
  in 
  any 
  other 
  species, 
  and 
  

   finally 
  the 
  stout 
  basal 
  joint 
  of 
  the 
  second 
  antennae 
  is 
  very 
  different 
  

   from 
  the 
  long 
  and 
  slender 
  basal 
  joint 
  in 
  oblonga. 
  

  

  