﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OP 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  235 
  

  

  legs 
  reduced 
  to 
  a 
  simple 
  one-jointed 
  process, 
  bipartite 
  at 
  the 
  tip; 
  

   thii'd 
  legs 
  with 
  a 
  broad 
  and 
  laminate 
  endopod 
  reaching 
  back 
  beyond 
  

   the 
  tips 
  of 
  the 
  fom-th 
  legs 
  and 
  covering 
  them 
  ventrally 
  ; 
  rami 
  of 
  fourth 
  

   legs 
  laminate 
  at 
  the 
  base, 
  flagellate 
  at 
  the 
  tip. 
  Fifth 
  and 
  genital 
  

   segments 
  and 
  abdomen 
  reduced 
  and 
  concealed 
  as 
  in 
  Lernantliro'pus; 
  

   anal 
  lanunse 
  short, 
  turned 
  over 
  ventrally 
  and 
  enlarged 
  into 
  four 
  

   blunt 
  lobes 
  at 
  the 
  tip. 
  Egg-tubes 
  unknown. 
  

  

  Type-species. 
  — 
  Sagum 
  jlagellatum. 
  

  

  (Sagum, 
  a 
  military 
  cloak, 
  alluding 
  to 
  the 
  shape 
  of 
  the 
  fused 
  dorsal 
  

   plates 
  covermg 
  the 
  thorax.) 
  

  

  SAGUM 
  FLAGELLATUM, 
  new 
  species. 
  

  

  Plate 
  39. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Two 
  females 
  of 
  this 
  new 
  genus 
  and 
  

   species, 
  both 
  lackuig 
  the 
  egg-strings, 
  were 
  obtained 
  from 
  the 
  gills 
  

   of 
  the 
  rock 
  hind, 
  Epinephelus 
  adscensionis, 
  August 
  9, 
  1910. 
  

  

  Type-specimen.— 
  C&t. 
  No. 
  42280, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  short 
  and 
  stout, 
  the 
  division 
  into 
  

   body 
  regions 
  very 
  indistinct. 
  Cephalothorax 
  short, 
  a 
  little 
  more 
  

   than 
  one-fourth 
  of 
  the 
  entire 
  length 
  and 
  one-fifth 
  wider 
  than 
  long; 
  

   deeply 
  notched 
  on 
  either 
  side 
  just 
  back 
  of 
  the 
  antennal 
  area, 
  the 
  

   portion 
  between 
  the 
  notches 
  forming 
  a 
  broad 
  rostrum 
  one-third 
  as 
  

   long 
  as 
  the 
  rest 
  of 
  the 
  cephalothorax. 
  This 
  is 
  a 
  condition 
  very 
  similar 
  

   to 
  that 
  found 
  in 
  the 
  genus 
  Ahasia.^ 
  The 
  carapace 
  is 
  prolonged 
  for- 
  

   ward 
  on 
  either 
  side 
  of 
  this 
  rostrum 
  as 
  a 
  short 
  process 
  or 
  wmg, 
  and 
  

   outward 
  on 
  either 
  lateral 
  margin 
  as 
  a 
  large 
  triangular 
  wing. 
  

  

  These 
  wings, 
  in 
  addition 
  to 
  the 
  rostrum, 
  give 
  the 
  cephalothorax 
  

   a 
  very 
  irregular 
  outline. 
  The 
  second, 
  third, 
  and 
  fourth 
  segments 
  

   are 
  so 
  thoroughly 
  fused 
  that 
  there 
  is 
  no 
  indication 
  of 
  any 
  joints, 
  

   and 
  they 
  are 
  covered 
  with 
  a 
  single, 
  continuous 
  dorsal 
  plate. 
  On 
  

   either 
  side 
  of 
  the 
  cephalothorax 
  the 
  second 
  segment 
  projects 
  forward 
  

   in 
  a 
  broad, 
  rounded 
  knob, 
  like 
  a 
  pair 
  of 
  shoulders. 
  The 
  posterior 
  

   corners 
  of 
  the 
  third 
  segment 
  are 
  similarly 
  prolonged 
  backward 
  and 
  

   outward 
  like 
  the 
  skirts 
  of 
  a 
  long 
  military 
  cloak. 
  The 
  part 
  corre- 
  

   sponding 
  to 
  the 
  fourth 
  dorsal 
  plate 
  in 
  Lernanthropus 
  is 
  as 
  wide 
  as 
  

   both 
  these 
  posterior 
  skirts 
  together, 
  and 
  about 
  the 
  same 
  length 
  as 
  

   the 
  rami 
  of 
  the 
  third 
  and 
  fourth 
  legs. 
  The 
  fifth 
  and 
  genital 
  seg- 
  

   ments 
  and 
  abdomen 
  are 
  entirely 
  concealed 
  between 
  the 
  third 
  and 
  

   fourth 
  legs 
  and 
  the 
  dorsal 
  carapace. 
  The 
  fifth 
  segment 
  is 
  rather 
  

   long 
  and 
  narrow 
  and 
  destitute 
  of 
  appendages; 
  the 
  genital 
  segment 
  

   is 
  transversely 
  elhptical 
  and 
  a 
  little 
  shorter 
  than 
  the 
  fifth 
  segment. 
  

  

  The 
  abdomen 
  is 
  half 
  the 
  width 
  of 
  the 
  genital 
  segment; 
  the 
  anal 
  

   laminse 
  extend 
  outward 
  ventrally 
  at 
  right 
  angles 
  to 
  the 
  body 
  axis 
  

   and 
  are 
  enlarged 
  at 
  the 
  tips 
  into 
  an 
  irregular 
  four-lobed 
  mass; 
  the 
  

  

  » 
  See 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  33, 
  p. 
  612. 
  

  

  