﻿204 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  Abdomen 
  abruptly 
  contracted 
  to 
  half 
  the 
  width 
  of 
  the 
  genital 
  

   segment, 
  three-jointed, 
  the 
  joints 
  diminisliing 
  slightl}^ 
  in 
  width 
  and 
  

   considerably 
  in 
  length; 
  anal 
  laminae 
  narrow 
  oblong, 
  three 
  times 
  as 
  

   long 
  as 
  wide 
  and 
  about 
  the 
  same 
  length 
  as 
  the 
  two 
  terminal 
  abdomen 
  

   joints. 
  

  

  Each 
  lamina 
  is 
  tipped 
  with 
  a 
  large 
  papilla 
  carrying 
  a 
  long 
  and 
  

   stout 
  seta, 
  and 
  with 
  four 
  short 
  spines, 
  three 
  at 
  the 
  tip 
  and 
  one 
  on 
  the 
  

   outer 
  n^argin. 
  

  

  Egg-strings 
  one-sixth 
  longer 
  than 
  the 
  entire 
  body; 
  eggs 
  large 
  and 
  

   uniseriate 
  except 
  for 
  a 
  short 
  distance 
  near 
  the 
  base 
  where 
  there 
  are 
  

   two 
  rows, 
  30 
  to 
  35 
  eggs 
  in 
  each 
  string. 
  

  

  First 
  antennae 
  not 
  enlarged 
  at 
  the 
  base, 
  but 
  with 
  a 
  row 
  of 
  wide 
  and 
  

   flattened 
  setae 
  along 
  the 
  anterior 
  margin; 
  segmentation 
  indistinct 
  but 
  

   apparently 
  made 
  up 
  of 
  five 
  joints. 
  

  

  Second 
  antennae 
  with 
  a 
  slightly 
  enlarged 
  terminal 
  joint, 
  tipped 
  

   with 
  a 
  fleshy 
  finger-like 
  process 
  and 
  two 
  long 
  curved 
  claws. 
  

  

  Extending 
  along 
  the 
  anterior 
  margin 
  of 
  the 
  joint 
  and 
  to 
  the 
  tip 
  of 
  

   the 
  finger 
  process 
  is 
  a 
  row 
  of 
  blunt 
  teeth; 
  the 
  surface 
  of 
  the 
  joint 
  is 
  

   also 
  covered 
  with 
  corrugated 
  ridges. 
  

  

  Upper 
  lip 
  large 
  and 
  shield-shaped, 
  with 
  prominent 
  rounded 
  ante- 
  

   rior 
  corners 
  and 
  a 
  three-lobed 
  posterior 
  margin. 
  Mandible 
  directed 
  

   backward 
  and 
  ending 
  in 
  a 
  smooth, 
  needle-like 
  spine. 
  First 
  maxilla 
  

   with 
  a 
  distinct 
  basal 
  portion 
  and 
  a 
  prominent 
  knob 
  armed 
  with 
  

   three 
  plumose 
  setae, 
  the 
  central 
  one 
  of 
  which 
  is 
  nearly 
  twice 
  the 
  

   length 
  of 
  the 
  other 
  two. 
  Second 
  maxilla 
  with 
  a 
  long 
  and 
  swollen 
  

   basal 
  joint 
  curved 
  forward 
  toward 
  the 
  end 
  and 
  tipped 
  with 
  two 
  short 
  

   and 
  stout 
  spines 
  covered 
  with 
  hairs. 
  Basal 
  joint 
  of 
  the 
  maxillipeds 
  

   partly 
  visible 
  behind 
  the 
  maxillae; 
  second 
  joint 
  curved 
  around 
  the 
  

   outside 
  of 
  the 
  second 
  maxilla 
  and 
  greatly 
  elongated 
  so 
  that 
  it 
  reaches 
  

   in 
  front 
  of 
  even 
  the 
  second 
  antennae; 
  terminal 
  claw 
  moderately 
  bent 
  

   and 
  following 
  the 
  inner 
  margin 
  of 
  the 
  second 
  joint, 
  without 
  accessory 
  

   spines 
  or 
  setae. 
  

  

  Exopod 
  of 
  first 
  swimming 
  leg 
  turned 
  forward 
  and 
  two-jointed, 
  

   terminal 
  joint 
  much 
  longer 
  than 
  the 
  basal; 
  endopod 
  extending 
  back- 
  

   ward 
  and 
  three-jointed. 
  Second, 
  third, 
  and 
  fourth 
  legs 
  with 
  three- 
  

   jointed 
  rami, 
  each 
  joint 
  of 
  the 
  exopod 
  armed 
  on 
  the 
  outer 
  margin 
  

   with 
  short 
  saw 
  teeth 
  and 
  one 
  or 
  more 
  long 
  spines 
  ; 
  arrangement 
  of 
  the 
  

   spines 
  and 
  setae 
  as 
  follows: 
  Second 
  exopod, 
  I 
  — 
  0, 
  I 
  — 
  0, 
  II 
  — 
  3; 
  endo- 
  

   pod, 
  0—1, 
  0—2, 
  II— 
  3. 
  Third 
  exopod, 
  I— 
  0, 
  I— 
  0, 
  III— 
  3; 
  endopod, 
  

   0—1, 
  0—1, 
  1—3. 
  Fourth 
  exopod, 
  I— 
  0, 
  I— 
  0, 
  III— 
  3; 
  endopod, 
  

   — 
  1, 
  — 
  1, 
  I 
  — 
  2. 
  Fifth 
  legs 
  uniramose 
  but 
  wider 
  and 
  longer 
  than 
  

   any 
  of 
  the 
  others, 
  each 
  tipped 
  with 
  three 
  spines 
  and 
  carrying 
  a 
  fourth 
  

   on 
  the 
  outer 
  margin. 
  

  

  