﻿202 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  to 
  the 
  anterior 
  margin 
  of 
  the 
  upper 
  lip 
  ; 
  the 
  terminal 
  claw 
  large 
  and 
  

   stout, 
  with 
  a 
  long 
  curved 
  accessory 
  spine 
  on 
  the 
  outer 
  (distal) 
  curve 
  

   of 
  the 
  S. 
  The 
  basal 
  joints 
  of 
  these 
  maxillipeds 
  are 
  plainly 
  visible 
  

   behind 
  the 
  maxillae 
  and 
  are 
  connected 
  across 
  the 
  midline 
  by 
  a 
  wide 
  

   sternum. 
  

  

  First 
  swimming 
  legs 
  with 
  a 
  one-jointed 
  exopod 
  and 
  a 
  three-jointed 
  

   endopod; 
  second^ 
  third, 
  and 
  fourth 
  legs 
  with 
  three-jointed 
  rami, 
  the 
  

   spines 
  and 
  setae 
  arranged 
  as 
  follows: 
  Second 
  exopod, 
  I 
  — 
  0, 
  I 
  — 
  1, 
  II 
  — 
  

   7; 
  endopod, 
  0-^1, 
  0—2, 
  1—3. 
  Third 
  exopod, 
  I— 
  0, 
  I— 
  1, 
  0—8; 
  

   endopod, 
  — 
  0, 
  0—2, 
  II 
  — 
  2. 
  Fourth 
  exopod, 
  I 
  — 
  0, 
  I 
  — 
  1, 
  0—8; 
  en- 
  

   dopod, 
  — 
  1, 
  — 
  1, 
  — 
  3. 
  The 
  sternal 
  plates 
  connecting 
  the 
  bases 
  

   of 
  the 
  third 
  and 
  fourth 
  legs 
  are 
  both 
  on 
  the 
  fused 
  (tliird 
  and 
  fourth) 
  

   segment, 
  the 
  former 
  near 
  the 
  anterior 
  margin, 
  the 
  latter 
  at 
  the 
  center. 
  

   The 
  fifth 
  legs 
  are 
  uniramose 
  and 
  two-jointed, 
  the 
  terminal 
  joint 
  

   spatulate 
  and 
  tipped 
  with 
  three 
  spines. 
  

  

  Color 
  a 
  translucent 
  cartilage 
  gray, 
  through 
  which 
  the 
  snow-white 
  

   uterine 
  processes 
  of 
  the 
  oviducts 
  show 
  prominently; 
  the 
  eggs 
  are 
  also 
  

   white 
  in 
  younger 
  stages 
  of 
  development. 
  

  

  Total 
  length, 
  1.80 
  mm. 
  Anterior 
  inflated 
  portion 
  of 
  body, 
  0.85 
  

   mm. 
  long, 
  0.75 
  mm. 
  wide. 
  Width 
  of 
  genital 
  segment, 
  0.28 
  mm. 
  

   Length 
  of 
  egg-strings, 
  1 
  mm. 
  

  

  Male. 
  — 
  General 
  body 
  form 
  elongate, 
  almost 
  linear; 
  cephalothorax 
  

   spindle-shaped, 
  strongly 
  contracted 
  anteriorly 
  and 
  posteriorly, 
  with 
  

   the 
  lateral 
  margins 
  projecting. 
  Posterior 
  body 
  diminishing 
  by 
  

   halves, 
  the 
  second 
  and 
  third 
  segments 
  nearly 
  the 
  same 
  width, 
  which 
  

   is 
  half 
  the 
  cephalothorax, 
  the 
  fourth, 
  fifth, 
  and 
  genital 
  segments 
  

   half 
  the 
  width 
  of 
  the 
  preceding 
  two, 
  the 
  abdomen 
  half 
  the 
  ^vidth 
  of 
  

   the 
  genital 
  segment 
  and 
  two-jointed, 
  the 
  basal 
  joint 
  twice 
  the 
  length 
  

   of 
  the 
  terminal; 
  anal 
  laminse 
  linear 
  and 
  two-thirds 
  the 
  length 
  of 
  the 
  

   last 
  joint. 
  

  

  Appendages 
  similar 
  to 
  those 
  of 
  the 
  female 
  with 
  the 
  usual 
  sexual 
  

   differences. 
  The 
  furca 
  on 
  the 
  ventral 
  margin 
  between 
  the 
  bases 
  of 
  

   the 
  first 
  antennae 
  is 
  considerably 
  enlarged 
  and 
  its 
  rami 
  overlap 
  the 
  

   second 
  antennae. 
  The 
  claws 
  at 
  the 
  tips 
  of 
  the 
  latter 
  appendages 
  are 
  

   also 
  much 
  enlarged 
  and 
  are 
  bent 
  into 
  a 
  half 
  circle. 
  The 
  maxillipeds 
  

   are 
  tliree-jointed, 
  the 
  second 
  joint 
  enlarged, 
  triangular, 
  and 
  armed 
  

   with 
  a 
  row 
  of 
  long 
  teeth 
  on 
  its 
  inner 
  margin; 
  terminal 
  clatv 
  slender, 
  

   curved 
  to 
  fit 
  down 
  over 
  the 
  second 
  joint, 
  beyond 
  the 
  proximal 
  end 
  of 
  

   which 
  it 
  projects 
  for 
  some 
  distance; 
  it 
  also 
  has 
  a 
  row 
  of 
  fine 
  saw 
  teeth 
  

   which 
  fit 
  against 
  those 
  on 
  the 
  second 
  joint. 
  

  

  First 
  swimming 
  legs 
  not 
  flattened, 
  as 
  in 
  the 
  female, 
  but 
  with 
  three- 
  

   jointed 
  rami 
  like 
  the 
  following 
  pairs; 
  in 
  the 
  fourth 
  endopod 
  the 
  two 
  

   terminal 
  joints 
  are 
  fused 
  with 
  only 
  marginal 
  notches 
  to 
  indicate 
  the 
  

   jointing; 
  other 
  legs 
  as 
  in 
  the 
  female. 
  

  

  