﻿214 
  PROCEEDIXGS 
  OP 
  THE 
  XATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  species, 
  while 
  the 
  two 
  from 
  the 
  jack 
  are 
  fully 
  as 
  large 
  as 
  his. 
  As 
  

   Bassett-Smith 
  sa3^s, 
  the 
  species 
  somewhat 
  resembles 
  Caligus 
  irntans 
  

   Heller, 
  but 
  it 
  shows 
  these 
  differences. 
  The 
  genital 
  segment 
  in 
  both 
  

   sexes 
  is 
  much 
  shorter 
  and 
  wider, 
  the 
  abdomen 
  is 
  narrower, 
  the 
  maxil- 
  

   lary 
  hooks 
  are 
  not 
  enlarged 
  in 
  the 
  male, 
  the 
  maxillipeds 
  are 
  alike 
  in 
  

   the 
  two 
  sexes 
  and 
  very 
  different 
  from 
  either 
  sex 
  in 
  irritans, 
  the 
  furca 
  

   is 
  much 
  stouter 
  and 
  often 
  contracted 
  at 
  the 
  center, 
  and 
  the 
  details 
  

   of 
  the 
  swimming 
  legs 
  are 
  quite 
  different, 
  especially 
  the 
  fourth 
  pair. 
  

  

  In 
  the 
  two 
  large 
  females 
  from 
  the 
  jack 
  the 
  contents 
  of 
  the 
  digestive 
  

   tube 
  showed 
  dark 
  bluish-black 
  by 
  transmitted 
  light, 
  and 
  the 
  ventral 
  

   surface 
  of 
  the 
  genital 
  segment 
  was 
  covered 
  with 
  an 
  irregular 
  pattern 
  

   of 
  fine 
  bluish-purple 
  lines. 
  

  

  As 
  the 
  species 
  has 
  been 
  seen 
  only 
  by 
  Bassett-Smith, 
  and 
  as 
  the 
  

   present 
  locality 
  is 
  far 
  removed 
  from 
  the 
  Indian 
  Ocean, 
  it 
  has 
  been 
  

   deemed 
  wise 
  to 
  give 
  a 
  new 
  description 
  and 
  figures. 
  

  

  CALIGUS 
  ATROMACULATUS, 
  new 
  species. 
  

  

  Plate 
  29, 
  figs. 
  92-98. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Two 
  females, 
  both 
  with 
  egg-strings, 
  

   belonging 
  to 
  this 
  tiny 
  species 
  were 
  found 
  fastened 
  to 
  the 
  gill 
  filaments 
  

   of 
  the 
  doctor 
  fish, 
  Teuthis 
  hepatus. 
  

  

  Type-specimen.— 
  Csit. 
  No. 
  42348, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  short 
  and 
  stout; 
  carapace 
  about 
  half 
  

   the 
  entire 
  length, 
  a 
  little 
  longer 
  than 
  wide; 
  frontal 
  plates 
  projecting 
  

   prominently; 
  lunules 
  large, 
  circular, 
  and 
  close 
  to 
  the 
  mid-line; 
  frontal 
  

   margin 
  straight 
  without 
  any 
  median 
  incision; 
  cross-bar 
  of 
  the 
  H 
  

   groove 
  curved 
  forward 
  so 
  that 
  its 
  center 
  is 
  close 
  behind 
  the 
  eye; 
  

   lateral 
  areas 
  only 
  one-seventh 
  the 
  width 
  of 
  the 
  thoracic 
  area, 
  lateral 
  

   lobes 
  pointed 
  and 
  curved 
  inward; 
  posterior 
  sinuses 
  narrow 
  and 
  deep; 
  

   median 
  lobe 
  almost 
  squarely 
  truncated 
  posteriorly 
  and 
  projecting 
  

   but 
  little 
  behind 
  the 
  lateral 
  lobes. 
  

  

  Eye 
  large 
  and 
  placed 
  about 
  one-fourth 
  of 
  the 
  length 
  of 
  the 
  cara- 
  

   pace 
  behind 
  its 
  anterior 
  margin. 
  

  

  Free 
  segment 
  short 
  and 
  contracted 
  into 
  a 
  waist 
  anteriorly; 
  genital 
  

   segment 
  ovate, 
  one-third 
  the 
  entire 
  length, 
  with 
  evenly 
  rounded 
  sides 
  

   and 
  corners 
  and 
  a 
  squarely 
  truncated 
  posterior 
  margin, 
  without 
  

   lobes 
  or 
  fifth 
  legs. 
  

  

  Abdomen 
  minute, 
  one-fourth 
  the 
  length 
  and 
  width 
  of 
  the 
  genital 
  

   segment; 
  anal 
  laminae 
  spherical 
  and 
  well 
  separated, 
  each 
  tipped 
  \vith 
  

   five 
  setae, 
  the 
  three 
  middle 
  ones 
  three 
  times 
  the 
  length 
  of 
  the 
  other 
  two. 
  

  

  Egg-strings 
  very 
  wide 
  and 
  short, 
  each 
  nearly 
  half 
  the 
  width 
  and 
  

   the 
  same 
  length 
  as 
  the 
  genital 
  segment 
  and 
  containing 
  a 
  dozen 
  eggs. 
  

  

  First 
  antennae 
  short 
  and 
  slender, 
  the 
  tips 
  just 
  reaching 
  the 
  lateral 
  

   margins 
  of 
  the 
  carapace; 
  second 
  pair 
  stout, 
  the 
  terminal 
  claw 
  much 
  

   longer 
  than 
  the 
  basal 
  joint 
  and 
  bent 
  near 
  its 
  tip; 
  maxillary 
  hooks 
  

  

  