﻿258 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  pushing 
  forward 
  and 
  curving 
  inward 
  of 
  the 
  second 
  antennae, 
  this 
  first 
  

   pair 
  comes 
  to 
  lie 
  between 
  the 
  second 
  pair 
  and 
  the 
  mouth 
  tube, 
  and 
  

   can 
  be 
  seen 
  only 
  from 
  the 
  ventral 
  surface 
  (fig. 
  267). 
  

  

  In 
  consequence 
  of 
  this 
  abortive 
  position 
  they 
  have 
  been 
  frequently 
  

   mistaken 
  for 
  other 
  appendages. 
  Second 
  antennse 
  of 
  the 
  usual 
  bira- 
  

   mose 
  form, 
  bent 
  across 
  the 
  anterior 
  margin 
  of 
  the 
  head 
  at 
  right 
  angles 
  

   to 
  the 
  body 
  axis, 
  with 
  their 
  tips 
  just 
  meeting 
  on 
  the 
  midhne 
  above 
  

   the 
  mouth 
  tube. 
  Exopod 
  broad, 
  one-jointed, 
  and 
  bluntly 
  rounded; 
  

   endopod 
  two-jointed, 
  much 
  narrower, 
  and 
  tipped 
  with 
  two 
  spines. 
  

   Mandibles 
  mounted 
  on 
  a 
  prominent 
  and 
  powerful 
  basal 
  joint, 
  just 
  

   outside 
  the 
  base 
  of 
  the 
  mouth 
  tube; 
  blade 
  curved 
  near 
  the 
  center 
  

   and 
  armed 
  with 
  teeth 
  of 
  two 
  sizes, 
  about 
  12 
  in 
  all. 
  

  

  First 
  maxillae 
  large 
  and 
  stout, 
  bipartite 
  at 
  the 
  tip, 
  each 
  ramus 
  

   ending 
  in 
  a 
  single 
  stout 
  spine; 
  palp 
  on 
  the 
  inner, 
  ventral 
  surface, 
  just 
  

   below 
  the 
  rami, 
  short 
  and 
  tipped 
  with 
  two 
  spines. 
  

  

  Second 
  maxillae 
  or 
  arms 
  one-half 
  longer 
  than 
  the 
  cephalothorax, 
  

   joined 
  only 
  at 
  the 
  tips, 
  where 
  is 
  formed 
  a 
  short 
  but 
  strong 
  mushroom 
  

   bulla. 
  

  

  No 
  swimming 
  legs 
  visible 
  anywhere 
  upon 
  the 
  body. 
  In 
  the 
  ripe 
  

   female 
  the 
  entire 
  body 
  behind 
  the 
  cephalothorax 
  is 
  filled 
  with 
  the 
  

   small 
  eggs. 
  

  

  Color 
  a 
  imiform 
  3^eUowish-white, 
  without 
  pigment. 
  

  

  Total 
  length, 
  8 
  mm. 
  Cephalothorax, 
  2.2 
  mm. 
  long, 
  1.2 
  mm. 
  wide. 
  

   Posterior 
  body, 
  6.8 
  mm. 
  long, 
  2.2 
  mm. 
  wide. 
  Egg-tubes, 
  4 
  mm. 
  long. 
  

  

  (longimana, 
  longus, 
  long, 
  and 
  manus, 
  hand, 
  alluding 
  to 
  the 
  length 
  

   of 
  the 
  arms 
  or 
  second 
  maxillae.) 
  

  

  Male. 
  — 
  General 
  body 
  form 
  spindle-shaped 
  and 
  rather 
  thickset; 
  

   divided 
  into 
  two 
  regions 
  by 
  a 
  well-defined 
  groove. 
  Cephalothorax 
  in 
  

   the 
  form 
  of 
  half 
  a 
  short 
  cone, 
  covered 
  with 
  a 
  carapace 
  which 
  projects 
  

   anteriorly 
  antl 
  along 
  the 
  sides 
  over 
  the 
  bases 
  of 
  the 
  appendages. 
  

   Thorax-abdomen 
  a 
  long 
  and 
  bluntly 
  rounded 
  cone, 
  twice 
  the 
  length 
  

   of 
  the 
  anterior 
  one 
  and 
  not 
  as 
  wide, 
  ending 
  ])osterioriy 
  in 
  a 
  pair 
  of 
  

   narrow 
  conical 
  anal 
  laminae. 
  

  

  First 
  antennae 
  attached 
  to 
  the 
  sides 
  of 
  the 
  carapace 
  some 
  little 
  

   distance 
  back 
  of 
  the 
  anterior 
  end, 
  indistinctly 
  jointed 
  and 
  tipped 
  with 
  

   two 
  tiny 
  spines. 
  Second 
  antennae 
  close 
  behind 
  the 
  first, 
  with 
  a 
  bira- 
  

   mose 
  tip, 
  the 
  exopod 
  of 
  which 
  ends 
  in 
  a 
  sickle-shaped 
  claw. 
  

  

  First 
  maxillae 
  between 
  the 
  base 
  of 
  the 
  antennae 
  and 
  the 
  mouth 
  tube, 
  

   projecting 
  considerably 
  be3^ond 
  the 
  tip 
  of 
  the 
  latter; 
  the 
  two 
  terminal 
  

   spines 
  and 
  palp 
  like 
  those 
  of 
  the 
  female. 
  Second 
  maxillae 
  short 
  and 
  

   stout 
  and 
  pointed 
  forward, 
  the 
  terminal 
  claw 
  also 
  short 
  and 
  stout, 
  

   sickle-shaped, 
  with 
  its 
  point 
  almost 
  in 
  contact 
  with 
  the 
  end 
  of 
  the 
  

   basal 
  joint. 
  

  

  Maxilhpeds 
  long 
  and 
  rather 
  slender 
  and 
  pointed 
  backward; 
  sec- 
  

   ond 
  joint 
  and 
  terminal 
  claw 
  bent 
  into 
  a 
  sort 
  of 
  corkscrew, 
  which 
  with 
  

   its 
  fellow 
  is 
  ordinarily 
  concealed 
  between 
  the 
  two 
  maxillipeds. 
  

  

  