﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  227 
  

  

  Total 
  length, 
  6 
  mm. 
  Carapace, 
  2.65 
  mm. 
  long, 
  3 
  mm. 
  wide. 
  

   Fourth 
  segment, 
  1.15 
  mm. 
  long. 
  Genital 
  segment, 
  2 
  mm. 
  long 
  and 
  

   the 
  same 
  width. 
  Egg-cases, 
  3.3 
  mm. 
  long. 
  

  

  (curticaudis, 
  curtus, 
  short, 
  and 
  cauda, 
  tail, 
  in 
  allusion 
  to 
  the 
  very- 
  

   short 
  abdomen.) 
  

  

  The 
  genus 
  Pardlehion 
  was 
  instituted^ 
  for 
  some 
  parasites, 
  including 
  

   both 
  sexes, 
  which 
  were 
  obtained 
  from 
  a 
  shark 
  in 
  Chesapeake 
  Bay. 
  

   In 
  the 
  type 
  species, 
  elongatus, 
  the 
  genital 
  segment 
  has 
  long 
  and 
  

   pointed 
  posterior 
  lobes, 
  the 
  abdomen 
  is 
  also 
  long 
  and 
  two-jointed, 
  

   theiurca 
  is 
  double, 
  and 
  there 
  are 
  plumose 
  setae 
  on 
  the 
  terminal 
  joint 
  

   of 
  the 
  first 
  swimming 
  legs. 
  In 
  the 
  present 
  species 
  the 
  lobes 
  of 
  the 
  

   genital 
  segment 
  are 
  broad 
  and 
  short, 
  the 
  abdomen 
  is 
  very 
  short, 
  the 
  

   furca 
  is 
  single, 
  and 
  there 
  are 
  no 
  plumose 
  setse 
  on 
  the 
  first 
  legs. 
  In 
  

   other 
  particulars 
  there 
  is 
  a 
  marked 
  similarity 
  between 
  the 
  two 
  spe- 
  

   cies, 
  with 
  just 
  those 
  differences 
  in 
  detail 
  that 
  would 
  naturally 
  be 
  

   expected. 
  

  

  Family 
  DICHELESTIID^. 
  

  

  LERNANTHROPUS 
  ANGULATUS 
  Krjfyer. 
  

   Lemanthropus 
  angulatus 
  Kr0yer, 
  1863, 
  p. 
  196, 
  pi. 
  9, 
  fig. 
  1 
  a-q. 
  

  

  Host 
  and 
  record 
  of 
  specimens.— 
  This 
  species 
  was 
  originally 
  described 
  

   by 
  Kr0yer 
  from 
  specimens 
  obtained 
  on 
  the 
  gills 
  of 
  a 
  West 
  Indian 
  

   Serranus, 
  one 
  of 
  the 
  groupers. 
  AU 
  the 
  other 
  records 
  are 
  simply 
  

   copies 
  of 
  this 
  one 
  of 
  Kr0yer's, 
  and 
  no 
  other 
  investigator 
  has 
  seen 
  

   the 
  species. 
  HeUer 
  suggests 
  (1865, 
  p. 
  213) 
  that 
  it 
  is 
  identical 
  with 
  

   the 
  Aeihon 
  quadratus 
  previously 
  described 
  by 
  Kr0yer. 
  (See 
  p. 
  192.) 
  

  

  LERNANTHROPUS 
  GIGANTEUS 
  Krf<yer. 
  

  

  Plate 
  33, 
  figs. 
  148-150; 
  plate 
  35. 
  

  

  Lemanthropus 
  giganteus 
  Kr0yer, 
  1863, 
  p. 
  206, 
  pi. 
  8, 
  fig. 
  1 
  a-e.— 
  Heider, 
  1879, 
  

   , 
  p. 
  345, 
  pi. 
  4, 
  figs. 
  53 
  to 
  55. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  This 
  species 
  was 
  established 
  by 
  

   Kr0yer 
  in 
  1863 
  for 
  a 
  single 
  female 
  obtained 
  from 
  the 
  gills 
  of 
  a 
  

   "Caranx 
  carangus" 
  taken 
  in 
  Brazil 
  and 
  sent 
  first 
  to 
  the 
  Vienna 
  

   Museum 
  and 
  thence 
  to 
  the 
  Royal 
  Museum 
  at 
  Copenhagen. 
  This 
  

   same 
  specimen 
  was 
  afterward 
  examined 
  and 
  described 
  by 
  Heider 
  

   (1879). 
  ''Many 
  specimens" 
  were 
  reported 
  by 
  Bassett-Smith 
  (1898, 
  

   p. 
  360) 
  from 
  the 
  gills 
  of 
  "Caranx 
  melampJiigus" 
  at 
  Aden 
  in 
  the 
  Indo- 
  

   Tropics. 
  In 
  the 
  present 
  instance 
  two 
  lots 
  were 
  obtained, 
  eacli 
  of 
  

   which 
  included 
  both 
  sexes; 
  the 
  first 
  from 
  the 
  gills 
  of 
  Caranx 
  crysos 
  

   is 
  included 
  under 
  Cat. 
  No. 
  42277, 
  U.S.N.M.; 
  the 
  second 
  from 
  the 
  

   gills 
  of 
  Caranx 
  Uppos, 
  under 
  Cat. 
  No. 
  42282, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  short 
  and 
  rather 
  plump; 
  cephalo- 
  

   thorax 
  ovoid, 
  its 
  posterior 
  corners 
  well 
  rounded, 
  with 
  the 
  sides 
  of 
  

   the 
  carapace 
  projecting 
  considerably 
  in 
  front 
  of 
  the 
  anterior 
  margin. 
  

  

  I 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  39, 
  p. 
  628. 
  

  

  