﻿228 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  tol. 
  44. 
  

  

  Antennal 
  segment 
  small, 
  triangular 
  in 
  shape, 
  and 
  just 
  fitting 
  into 
  the 
  

   sinus 
  between 
  the 
  projecting 
  sides 
  of 
  the 
  carapace. 
  Second 
  and 
  third 
  

   segments 
  in 
  the 
  free 
  thorax 
  covered 
  with 
  a 
  dorsal 
  plate 
  trapezoidal 
  

   in 
  outline, 
  narrowed 
  anteriorly 
  and 
  widened 
  posteriorly, 
  with 
  a 
  short 
  

   triangular 
  process 
  extending 
  outwards 
  and 
  backwards 
  from 
  each 
  pos- 
  

   terior 
  corner 
  opposite 
  the 
  bases 
  of 
  the 
  third 
  legs. 
  Fourth 
  segment 
  

   with 
  a 
  dorsal 
  plate 
  which 
  is 
  considerably 
  wider 
  than 
  the 
  one 
  just 
  

   mentioned, 
  and 
  which 
  extends 
  back 
  well 
  beyond 
  the 
  tips 
  of 
  the 
  anal 
  

   laminas. 
  In 
  shape 
  it 
  is 
  about 
  three-quarters 
  of 
  an 
  ellipse, 
  the 
  straight 
  

   edge 
  being 
  separated 
  from 
  the 
  posterior 
  margin 
  of 
  the 
  preceding 
  

   plate 
  by 
  a 
  well 
  defined 
  groove, 
  and 
  the 
  remainder 
  of 
  the 
  margin 
  being 
  

   evenly 
  curved, 
  with 
  no 
  posterior 
  sinus. 
  Fifth 
  segment 
  very 
  short 
  

   and 
  narrow, 
  and 
  having 
  a 
  pair 
  of 
  uniramose 
  fifth 
  legs, 
  which 
  are 
  

   linear, 
  curved 
  like 
  parenthesis 
  marks, 
  and 
  do 
  not 
  quite 
  reach 
  the 
  

   posterior 
  margin 
  of 
  the 
  dorsal 
  plate 
  of 
  the 
  fourth 
  segment. 
  Genital 
  

   segment 
  also 
  short 
  and 
  narrow, 
  bearing 
  on 
  its 
  sides 
  the 
  egg-tubes, 
  

   and 
  at 
  the 
  posterior 
  corners 
  the 
  large 
  secondary 
  spermatophores. 
  

  

  Abdomen 
  minute, 
  one-jointed, 
  almost 
  completely 
  fused 
  with 
  the 
  

   genital 
  segment; 
  anal 
  laminsB 
  linear, 
  as 
  long 
  as 
  the 
  entire 
  abdomen, 
  

   and 
  destitute 
  of 
  setae 
  or 
  spines. 
  Egg-tubes 
  narrow, 
  and 
  two 
  and 
  a 
  

   half 
  times 
  the 
  length 
  of 
  the 
  body; 
  eggs 
  thin, 
  numerous, 
  and 
  arranged 
  

   occasionally 
  in 
  more 
  than 
  a 
  single 
  row. 
  (See 
  fig. 
  150.) 
  

  

  First 
  antennae 
  six-jointed 
  and 
  very 
  short; 
  the 
  second 
  pair 
  some 
  dis- 
  

   tance 
  behind 
  the 
  first, 
  and 
  curved 
  over 
  ventrally 
  between 
  the 
  sides 
  of 
  

   the 
  carapace 
  so 
  as 
  to 
  be 
  invisible 
  in 
  dorsal 
  view. 
  At 
  their 
  base, 
  where 
  

   they 
  join 
  the 
  front 
  of 
  the 
  head, 
  they 
  are 
  supported 
  by 
  a 
  stout 
  and 
  

   complicated 
  chitin 
  framework. 
  The 
  mocth 
  tube 
  and 
  mouth 
  parts 
  are 
  

   carried 
  back 
  so 
  far 
  behind 
  the 
  antennae 
  that 
  they 
  appear 
  to 
  belong 
  to 
  

   the 
  thorax 
  rather 
  than 
  the 
  head. 
  Mandibles 
  of 
  the 
  usual 
  pattern; 
  

   first 
  maxillae 
  stout, 
  the 
  basal 
  joint 
  swollen, 
  the 
  terminal 
  joint 
  tipped 
  

   with 
  a 
  straight 
  and 
  stout 
  spine. 
  Second 
  maxillae 
  simple, 
  the 
  terminal 
  

   claw 
  stout, 
  nearly 
  straight, 
  and 
  two-thirds 
  as 
  long 
  as 
  the 
  basal 
  joint. 
  

   Basal 
  joint 
  of 
  maxillipeds 
  much 
  swollen, 
  terminal 
  claw 
  slender, 
  

   slightly 
  curved, 
  and 
  half 
  the 
  length 
  of 
  the 
  basal 
  joint. 
  

  

  Endopods 
  of 
  first 
  and 
  second 
  legs 
  tipped 
  with 
  a 
  single 
  long 
  and 
  

   straight 
  spine; 
  exopod 
  of 
  first 
  pair 
  with 
  five 
  terminal 
  saw 
  teeth, 
  exo- 
  

   pod 
  of 
  second 
  pair 
  with 
  four. 
  Inside 
  of 
  the 
  endopod 
  of 
  the 
  first 
  legs 
  

   is 
  a 
  small 
  papilla 
  tipped 
  with 
  a 
  spine. 
  

  

  The 
  third 
  legs 
  are 
  shaped 
  like 
  those 
  of 
  L. 
  gisleri, 
  Jcr0yeri, 
  pagodus, 
  

   etc., 
  and 
  are 
  distinctly 
  bilobed, 
  one 
  lobe 
  extending 
  backward, 
  the 
  

   other 
  outward 
  at 
  right 
  angles 
  to 
  the 
  body 
  axis. 
  The 
  rami 
  of 
  the 
  

   fourth 
  legs 
  are 
  narrow 
  and 
  acuminate 
  and 
  reach 
  for 
  nearly 
  their 
  whole 
  

   length 
  behind 
  the 
  dorsal 
  plate 
  of 
  the 
  fourth 
  segment. 
  The 
  more 
  or 
  

   less 
  irregular 
  arrangement 
  of 
  the 
  eggs 
  and 
  the 
  attachment 
  of 
  the 
  

   spermatophores 
  (fig. 
  149) 
  are 
  worthy 
  of 
  especial 
  notice. 
  

  

  