﻿NO, 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS—WILSON. 
  257 
  

  

  second 
  maxillae 
  sometimes 
  longer 
  than 
  the 
  cephalothorax, 
  united 
  only 
  

   at 
  the 
  tip; 
  maxillipeds 
  wdth 
  a 
  powerful 
  basal 
  joint 
  and 
  a 
  short 
  ter- 
  

   minal 
  claw. 
  

  

  Male. 
  — 
  Body 
  short 
  and 
  thickset; 
  cephalothorax 
  more 
  or 
  less 
  com- 
  

   pletely 
  separated 
  from 
  the 
  posterior 
  unsegmented 
  portion; 
  the 
  latter 
  

   terminated 
  by 
  two 
  conical 
  anal 
  lamina?. 
  Appendages 
  on 
  the 
  ventral 
  

   surface 
  at 
  right 
  angles 
  to 
  tlie 
  body 
  axis; 
  second 
  antennae 
  uncinate; 
  

   second 
  maxillse 
  with 
  stout 
  sickle-shaped 
  claws; 
  terminal 
  portion 
  of 
  

   the 
  maxillipeds 
  twisted 
  like 
  a 
  corkscrew. 
  

  

  THYSANOTE 
  LONGIMANA, 
  new 
  species. 
  

   Plate 
  47, 
  figs. 
  262-264; 
  plate 
  48. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Five 
  females 
  and 
  three 
  males 
  w^ere 
  

   obtained 
  from 
  the 
  outside 
  of 
  the 
  throat 
  of 
  the 
  red 
  snapper, 
  Neomxnis 
  

   aya, 
  July 
  23, 
  1910. 
  

  

  Type-specimen. 
  — 
  A 
  female, 
  Cat. 
  No. 
  43552, 
  U.S.N.M. 
  Paratypes, 
  

   Cat. 
  No. 
  42281, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  elongate, 
  widest 
  posteriorly; 
  divided 
  

   into 
  two 
  regions, 
  the 
  cephalothorax 
  and 
  the 
  fused 
  thorax 
  and 
  abdo- 
  

   men. 
  Cephalothorax 
  oblong, 
  one-third 
  of 
  the 
  entire 
  length, 
  bluntly 
  

   rounded 
  anteriorly, 
  and 
  enlarged 
  posteriorly 
  through 
  the 
  bases 
  of 
  the 
  

   second 
  maxillae. 
  Body 
  inversely 
  club-shaped, 
  with 
  a 
  smooth 
  surface 
  

   and 
  evenly 
  rounded 
  outlines, 
  the 
  only 
  trace 
  of 
  segmentation 
  being 
  

   found 
  in 
  the 
  interruption 
  of 
  the 
  longitudinal 
  muscles 
  which 
  run 
  along 
  

   the 
  midhne 
  on 
  both 
  the 
  dorsal 
  and 
  ventral 
  surfaces. 
  There 
  are 
  three 
  

   of 
  these 
  muscle 
  breaks, 
  making 
  four 
  segments, 
  the 
  last 
  of 
  which 
  is 
  a 
  

   fusion 
  of 
  the 
  fifth 
  and 
  sixth 
  (genital) 
  segments, 
  and 
  the 
  abdomen. 
  

   The 
  egg-tubes 
  are 
  attached 
  to 
  the 
  posterior 
  margin 
  of 
  this 
  fused 
  seg- 
  

   ment, 
  nearer 
  the 
  dorsal 
  than 
  the 
  ventral 
  surface; 
  they 
  are 
  cyhn- 
  

   drical 
  in 
  form 
  and 
  about 
  two-thirds 
  of 
  the 
  entire 
  length. 
  The 
  eggs 
  

   are 
  rather 
  small 
  and 
  are 
  arranged 
  in 
  five 
  or 
  six 
  longitudinal 
  rows, 
  

   from 
  25 
  to 
  30 
  eggs 
  in 
  each 
  row. 
  There 
  are 
  eight 
  of 
  the 
  branched 
  

   processes 
  which 
  characterize 
  the 
  genus; 
  the 
  first 
  pair 
  are 
  attached 
  

   to 
  the 
  arms 
  about 
  one-third 
  of 
  their 
  length 
  from 
  the 
  base; 
  the 
  second 
  

   pair 
  are 
  attached 
  to 
  the 
  arms 
  where 
  the 
  latter 
  join 
  the 
  body, 
  so 
  that 
  

   in 
  some 
  specimens 
  thej' 
  seem 
  to 
  come 
  from 
  the 
  sides 
  of 
  the 
  body; 
  

   the 
  third 
  and 
  fourth 
  pairs 
  are 
  close 
  together 
  at 
  the 
  posterior 
  corners 
  

   of 
  the 
  last 
  (fused) 
  body 
  segment. 
  The 
  branching 
  is 
  dichotomous, 
  

   and 
  none 
  of 
  the 
  rami 
  are 
  divided 
  more 
  than 
  once 
  or 
  twice, 
  making 
  

   the 
  processes 
  comparatively 
  simple. 
  

  

  Between 
  the 
  egg-tubes, 
  on 
  either 
  side 
  of 
  the 
  anus, 
  and 
  on 
  a 
  level 
  

   with 
  the 
  ventral 
  surface, 
  is 
  a 
  short, 
  finger-like 
  process. 
  

  

  First 
  antennae 
  imperfectly 
  segmented 
  and 
  tipped 
  with 
  a 
  pair 
  of 
  

   very 
  short 
  spines, 
  but 
  without 
  any 
  other 
  armature. 
  Owing 
  to 
  the 
  

   69077°— 
  Proc.N.M.vol.44— 
  13 
  17 
  

  

  