﻿216 
  PROCEEnTNOS 
  OF 
  THE 
  XATTONAL 
  MUSEUM. 
  vol.44. 
  

  

  anteriorly, 
  crossing 
  the 
  midline 
  at 
  the 
  center 
  of 
  the 
  carapace. 
  Free 
  

   segment 
  short, 
  one-fourth 
  the 
  width 
  of 
  the 
  carapace 
  and 
  swollen 
  

   through 
  the 
  bases 
  of 
  the 
  legs. 
  Genital 
  segment 
  ovate, 
  with 
  strongly 
  

   convex 
  sides 
  and 
  short, 
  broad 
  posterior 
  lobes. 
  

  

  Abdomen 
  minute, 
  triangular, 
  one-jointed; 
  anal 
  laminae 
  long 
  and 
  

   narrow, 
  each 
  tipped 
  with 
  four 
  tiny 
  spines. 
  

  

  Egg-strings 
  three-fourths 
  as 
  long 
  as 
  the 
  entire 
  body, 
  each 
  con- 
  

   taining 
  about 
  30 
  eggs. 
  

  

  First 
  antennse 
  small, 
  the 
  joints 
  about 
  the 
  same 
  length; 
  second 
  ])air 
  

   Jarge, 
  with 
  a 
  long 
  and 
  slender 
  terminal 
  claw 
  bent 
  into 
  a 
  half 
  circle. 
  

   Maxillary 
  hooks 
  so 
  minute 
  as 
  to 
  be 
  scarcely 
  visible; 
  first 
  maxillre 
  

   reduced 
  to 
  mere 
  pimples 
  at 
  the 
  sides 
  of 
  the 
  mouth 
  tube, 
  short 
  and 
  

   bluntly 
  rounded 
  but 
  still 
  retaining 
  the 
  rudimentary 
  exopod 
  tipped 
  

   with 
  two 
  spines. 
  Maxillipeds 
  long 
  and 
  slender, 
  basal 
  jomt 
  three 
  and 
  

   a 
  half 
  times 
  as 
  long 
  as 
  wide, 
  terminal 
  claw 
  stout 
  and 
  acuminate, 
  

   shorter 
  than 
  the 
  basal 
  joint 
  and 
  not 
  much 
  curved. 
  First 
  swimming 
  

   legs 
  also 
  long 
  and 
  slender, 
  the 
  terminal 
  joint 
  with 
  only 
  two 
  claws 
  at 
  

   the 
  end 
  and 
  three 
  weak 
  setae 
  on 
  the 
  posterior 
  border. 
  Terminal 
  

   joint 
  of 
  the 
  exopod 
  of 
  the 
  second 
  legs 
  long 
  and 
  wide, 
  spine 
  on 
  the 
  

   basal 
  joint 
  narrow 
  and 
  acuminate, 
  spines 
  on 
  the 
  two 
  terminal 
  joints 
  

   exceptionally 
  small 
  and 
  short. 
  Rami 
  of 
  third 
  legs 
  well 
  separated, 
  

   claw 
  on 
  the 
  exopod 
  short, 
  stout, 
  and 
  straight, 
  the 
  joints 
  longer 
  than 
  

   usual 
  and 
  well 
  armed 
  with 
  setae 
  and 
  spines. 
  Fourth 
  legs 
  three- 
  

   jointed, 
  the 
  two 
  terminal 
  of 
  the 
  usual 
  four 
  joints 
  being 
  fused; 
  basal 
  

   joint 
  a 
  little 
  longer 
  than 
  the 
  rest 
  of 
  the 
  leg 
  and 
  carrying 
  a 
  good-sized 
  

   spine 
  on 
  its 
  outer 
  margin 
  near 
  the 
  distal 
  end; 
  the 
  inner 
  terminal 
  

   spine 
  about 
  twice 
  the 
  length 
  of 
  the 
  other 
  four, 
  which 
  are 
  subequal. 
  

  

  Cement 
  glands 
  short 
  and 
  stout 
  and 
  inclined 
  away 
  from 
  the 
  mid- 
  

   line 
  with 
  their 
  convex 
  sides 
  toward 
  it. 
  

  

  Color 
  a 
  dark 
  cartilage-gray, 
  ornamented 
  on 
  the 
  dorsal 
  surface 
  of 
  

   the 
  entire 
  body, 
  and 
  on 
  the 
  ventral 
  surface 
  of 
  the 
  abdomen, 
  with 
  an 
  

   intricate 
  network 
  of 
  fine 
  lines 
  of 
  dark 
  bluish-purple. 
  

  

  Total 
  length, 
  2.32 
  mm. 
  Carapace, 
  1.4 
  mm. 
  long, 
  1.25 
  mm. 
  wide. 
  

   Genital 
  segment, 
  0.75 
  mm. 
  long, 
  0.65 
  mm. 
  wide. 
  Egg-strings, 
  1.9 
  

   mm. 
  long. 
  

  

  (afurcatus, 
  a, 
  not, 
  and 
  furcatus, 
  provided 
  with 
  a 
  furca.) 
  

  

  This 
  species 
  bears 
  some 
  resemblance 
  to 
  C. 
  halistse, 
  but 
  may 
  be 
  

   easily 
  distinguished 
  by 
  the 
  much 
  shorter 
  abdomen, 
  by 
  the 
  absence 
  

   of 
  a 
  furca, 
  by 
  the 
  degenerate 
  form 
  of 
  the 
  maxillary 
  hooks 
  and 
  first 
  

   maxillae, 
  and 
  by 
  the 
  fact 
  that 
  the 
  fourth 
  legs 
  have 
  five 
  spines 
  instead 
  

   of 
  only 
  four. 
  The 
  only 
  other 
  Caligus 
  species 
  which 
  possess 
  as 
  short 
  

   an 
  abdomen 
  are 
  Kr0yer's 
  C. 
  abhreviatus 
  and 
  the 
  species 
  which 
  here 
  

   follows, 
  C. 
  enormis. 
  

  

  From 
  the 
  former 
  the 
  present 
  species 
  may 
  be 
  distinguished 
  by 
  the 
  

   absence 
  of 
  a 
  furca 
  and 
  the 
  fifth 
  legs, 
  and 
  b}^ 
  the 
  presence 
  of 
  six 
  spines 
  

  

  