﻿BIHANG 
  TILL 
  K. 
  SV. 
  VET. 
  AKAD. 
  HANDL. 
  BAND. 
  6. 
  N:0 
  4. 
  9 
  

  

  The 
  second 
  pair 
  of 
  gnathopoda 
  is 
  fully 
  equal 
  to 
  the 
  

   followiBg 
  pereiopoda. 
  

  

  The 
  pereiopoda. 
  The 
  three 
  first 
  pairs 
  are 
  directed 
  forwards, 
  

   the 
  remaiuder 
  backwards. 
  They 
  are 
  all 
  nearly 
  equal 
  in 
  size. 
  

   The 
  coxge 
  are 
  fixed 
  on 
  the 
  flat 
  under 
  side 
  of 
  the 
  segments. 
  

   The 
  second 
  pair 
  of 
  gnathopoda 
  and 
  the 
  first 
  and 
  second 
  pairs 
  

   of 
  the 
  pereiopoda 
  are 
  fixed 
  between 
  the 
  cornua 
  of 
  the 
  seg- 
  

   ments, 
  in 
  a 
  small 
  excavation 
  at 
  their 
  base. 
  The 
  remainder 
  

   are 
  inserted 
  at 
  the 
  posterior 
  margin 
  of 
  every 
  segment^ 
  on 
  

   the 
  under 
  side 
  of 
  the 
  little 
  secondary 
  spine 
  (Pl. 
  II, 
  fig. 
  11, 
  

   Pl. 
  III, 
  fig. 
  25 
  and 
  28). 
  

  

  The 
  second 
  joint 
  or 
  basis 
  lies 
  close 
  to 
  the 
  underside 
  

   of 
  the 
  segment, 
  nearly 
  reaching 
  to 
  the 
  median 
  carina 
  (Pl. 
  II 
  

   fig. 
  11)]; 
  it 
  is 
  long, 
  cylindrical, 
  with 
  narrowed 
  ends, 
  without 
  

   hairs 
  or 
  bristles; 
  the 
  following 
  joint, 
  the 
  is 
  chium, 
  is 
  tolerably 
  

   long, 
  but 
  shorter 
  than 
  the 
  basis, 
  with 
  slightly 
  arched 
  mar- 
  

   gins 
  beset 
  with 
  some 
  short, 
  simple 
  bristles 
  ; 
  the 
  meros 
  is 
  short, 
  

   the 
  lower 
  margin 
  is 
  straight 
  with 
  shorter 
  and 
  longer 
  bristles, 
  

   the 
  upper 
  side 
  is 
  produced 
  into 
  a 
  strong 
  process, 
  tipped 
  with 
  

   long, 
  stout 
  bristles. 
  The 
  carpus 
  is 
  long, 
  nearly 
  as 
  long 
  as 
  

   the 
  basis; 
  the 
  upper 
  margin 
  produced 
  into 
  an 
  angle 
  covered 
  

   with 
  hairs, 
  the 
  under 
  margin 
  is 
  waved, 
  beset 
  with 
  short 
  hairs 
  

   and 
  bristles. 
  The 
  propus 
  is 
  long, 
  (longest 
  in 
  the 
  fourth 
  pair 
  

   of 
  pereiopoda), 
  but 
  not 
  so 
  long 
  as 
  the 
  carpus; 
  the 
  inner 
  

   margin 
  is 
  straight, 
  with 
  short, 
  fine 
  bristles, 
  the 
  outer 
  margin 
  

   is 
  slightly 
  curved, 
  with 
  bundles 
  of 
  straight, 
  simple 
  hairs. 
  

   The 
  dactylus 
  is 
  very 
  short, 
  a 
  sixth 
  of 
  the 
  length 
  of 
  the 
  

   propus, 
  with 
  a 
  few, 
  short 
  bristles 
  and 
  the 
  two 
  ungues, 
  of 
  

   which 
  the 
  outer 
  is 
  much 
  longer 
  than 
  the 
  inner. 
  

  

  The 
  pleopoda. 
  Between 
  the 
  last 
  segment 
  of 
  the 
  pereion 
  

   and 
  the 
  cöalesced 
  pleo-ural 
  segment 
  is 
  no 
  trace 
  to 
  be 
  seen 
  

   of 
  any 
  preceding 
  segment, 
  as 
  is 
  the 
  case 
  in 
  the 
  Asellus. 
  

   From 
  the 
  under 
  anterior 
  limit 
  of 
  this 
  cöalesced 
  segment, 
  

   which, 
  for 
  shortness 
  sake, 
  we 
  call 
  pleon, 
  extends 
  the 
  male 
  

   organ, 
  broadest 
  at 
  the 
  base, 
  elongated, 
  reaching 
  nearly 
  to 
  the 
  

   posterior 
  margin 
  of 
  the 
  excavation, 
  which 
  contains 
  the 
  

   branchial 
  feet. 
  It 
  is 
  the 
  first 
  pair 
  of 
  pleopoda 
  transformed. 
  

   At 
  its 
  apex, 
  it 
  is 
  slightly 
  hollowed 
  on 
  the 
  upper 
  (inner) 
  

   side, 
  and 
  finely 
  ciliated 
  (Pl. 
  III 
  fig. 
  28). 
  At 
  the 
  middle 
  

   of 
  the 
  inner 
  side 
  there 
  is 
  a 
  reservoir 
  for 
  the 
  sperma, 
  for- 
  

   ming 
  a 
  broad, 
  rounded 
  bulbus, 
  with 
  slightly 
  curved 
  ducts 
  

   in 
  both 
  sides 
  of 
  the 
  bipartite 
  organ 
  (Pl. 
  II, 
  fig. 
  24). 
  

  

  