﻿212 
  PROCEEDIXGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  Furca 
  much 
  narrower 
  than 
  in 
  the 
  female 
  and 
  somewhat 
  different 
  

   in 
  shape. 
  (See 
  fig. 
  72.) 
  

  

  Color 
  like 
  that 
  of 
  the 
  female. 
  

  

  Total 
  length, 
  3.5 
  mm. 
  Carapace, 
  2 
  mm. 
  long, 
  1.5 
  mm. 
  wide. 
  

   Genital 
  segment, 
  0.57 
  mm. 
  long, 
  0.48 
  mm. 
  wide. 
  

  

  This 
  species 
  was 
  originally 
  described 
  by 
  Heller 
  from 
  specimens 
  

   obtained 
  on 
  the 
  gills 
  of 
  a 
  Serranus 
  species 
  from 
  Brazil 
  and 
  has 
  not 
  

   been 
  seen 
  since. 
  The 
  present 
  specimens 
  differ 
  in 
  several 
  of 
  the 
  

   minor 
  details 
  but 
  are 
  undoubtedly 
  the 
  same 
  species. 
  They 
  are 
  here 
  

   redescribed 
  to 
  confirm 
  Heller's 
  species, 
  to 
  show 
  the 
  variations 
  in 
  

   minor 
  details, 
  and 
  to 
  emphasize 
  the 
  distinguishing 
  characters. 
  These 
  

   latter 
  are 
  to 
  be 
  found 
  in 
  the 
  general 
  body 
  proportions, 
  the 
  exception- 
  

   ally 
  large 
  lunules, 
  the 
  very 
  short 
  and 
  almost 
  circular 
  mouth 
  tube, 
  

   and 
  in 
  the 
  male 
  the 
  stubby 
  claws 
  on 
  the 
  second 
  antennae, 
  the 
  greatly 
  

   enlarged 
  maxillary 
  hook 
  and 
  the 
  stout, 
  toothed 
  basal 
  joints 
  of 
  the 
  

   maxillipeds. 
  

  

  The 
  species 
  is 
  very 
  rare, 
  only 
  the 
  single 
  pair 
  being 
  obtained 
  during 
  

   the 
  entire 
  season. 
  

  

  CALIGUS 
  ROBUSTUS 
  Bassett-Smith. 
  

   Plate 
  28. 
  

   Caligus 
  robustus 
  Bassett-Smith, 
  1898, 
  p. 
  361, 
  pi. 
  11, 
  figs. 
  1-2. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  A 
  male 
  and 
  female 
  were 
  obtained 
  

   from 
  the 
  gills 
  of 
  the 
  red-mouthed 
  grunt, 
  Bathystoma 
  rimator, 
  July 
  14, 
  

   1910, 
  and 
  have 
  received 
  Cat. 
  No. 
  42260, 
  U.S.N.M. 
  Two 
  much 
  larger 
  

   females 
  were 
  afterwards 
  found 
  upon 
  the 
  gills 
  of 
  the 
  crevalle, 
  Caranx 
  

   crysos, 
  and 
  were 
  given 
  Cat. 
  No. 
  42268, 
  U.S.N.M, 
  

  

  Female. 
  — 
  General 
  body 
  form 
  short 
  and 
  stout; 
  carapace 
  ovate, 
  as 
  

   wide 
  as 
  long; 
  frontal 
  plates 
  narrow 
  and 
  not 
  prominent; 
  lunules 
  small, 
  

   circular, 
  and 
  projecting 
  moderately; 
  lateral 
  areas 
  very 
  wide 
  and 
  

   terminating 
  in 
  wide 
  and 
  blunt 
  posterior 
  lobes; 
  median 
  lobe 
  three- 
  

   sevenths 
  the 
  entire 
  width 
  and 
  reaching 
  but 
  little 
  behind 
  the 
  lateral 
  

   lobes; 
  posterior 
  sinuses 
  shallow 
  with 
  parallel 
  sides. 
  

  

  Eye 
  medium-sized 
  and 
  placed 
  far 
  forward, 
  one-fifth 
  the 
  length 
  of 
  

   the 
  carapace 
  behind 
  the 
  anterior 
  margin. 
  

  

  Free 
  segment 
  nearly 
  one-third 
  the 
  width 
  of 
  the 
  carapace, 
  strongly 
  

   contracted 
  anteriorly 
  and 
  posteriorly. 
  Genital 
  segment 
  broad 
  

   acorn-shaped, 
  a 
  little 
  wider 
  than 
  long, 
  with 
  the' 
  lateral 
  margins 
  

   strongly 
  convex, 
  the 
  posterior 
  margin 
  nearly 
  straight, 
  the 
  corners 
  

   evenly 
  rounded 
  without 
  lobes, 
  and 
  the 
  fifth 
  legs 
  visible 
  just 
  outside 
  

   the 
  bases 
  of 
  the 
  egg 
  strings. 
  Abdomen 
  less 
  than 
  one-fourth 
  the 
  

   width 
  of 
  the 
  genital 
  segment 
  and 
  considerably 
  shorter, 
  two-jointed, 
  

   basal 
  joint 
  twice 
  the 
  length 
  of 
  the 
  terminal. 
  

  

  Anal 
  laminse 
  large 
  and 
  inclined 
  toward 
  each 
  other, 
  each 
  tipped 
  

   with 
  three 
  setae 
  of 
  equal 
  length 
  and 
  two 
  short 
  spiaes 
  on 
  the 
  outer 
  

  

  