﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  233 
  

  

  The 
  outer 
  terminal 
  spine 
  of 
  the 
  first 
  maxillse 
  is 
  much 
  shorter 
  than 
  

   the 
  inner 
  one; 
  the 
  terminal 
  claws 
  of 
  the 
  second 
  maxillae 
  and 
  maxilli- 
  

   peds 
  are 
  relatively 
  shorter; 
  the 
  rami 
  of 
  the 
  first 
  and 
  second 
  legs 
  are 
  

   less 
  plump; 
  the 
  thhd 
  and 
  fourth 
  legs 
  are 
  both 
  uniramose, 
  and 
  the 
  

   rami 
  are 
  narrow-cylmdrical. 
  

  

  Color 
  of 
  Both 
  sexes 
  a 
  light 
  yellowish- 
  white, 
  without 
  pigment. 
  

  

  Total 
  length, 
  with 
  fourth 
  legs, 
  3 
  mm.; 
  without 
  them, 
  2 
  mm. 
  

   Cephalothorax, 
  1 
  mm. 
  long, 
  0.66 
  mm. 
  wide. 
  Posterior 
  body, 
  1 
  mm. 
  

   long, 
  0.66 
  mm. 
  wide. 
  

  

  (ohscurus, 
  obscure 
  or 
  hidden, 
  in 
  the 
  sense 
  that 
  the 
  species 
  does 
  not 
  

   possess 
  any 
  very 
  marked 
  characters.) 
  

  

  Tliis 
  species 
  has 
  to 
  be 
  recognized 
  by 
  an 
  aggregation 
  of 
  characters 
  

   rather 
  than 
  by 
  any 
  one 
  or 
  two. 
  The 
  narrow 
  second 
  and 
  third 
  thorax 
  

   segments, 
  the 
  deep 
  sums 
  between 
  the 
  third 
  and 
  fourth 
  segments, 
  the 
  

   uniramose 
  third 
  legs 
  and 
  the 
  very 
  long 
  fourth 
  legs, 
  make 
  a 
  combina- 
  

   tion 
  found 
  in 
  no 
  other 
  species. 
  

  

  It 
  is 
  not 
  at 
  all 
  common, 
  being 
  found 
  on 
  but 
  a 
  single 
  fish 
  during 
  the 
  

   entire 
  season. 
  

  

  LERNANTHROPUS 
  SPICULATUS, 
  new 
  species. 
  

   Plate 
  38, 
  figs. 
  185-189. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  A 
  single 
  lot, 
  consisting 
  of 
  three 
  

   females, 
  was 
  obtained 
  from 
  the 
  gills 
  of 
  the 
  lane 
  snapper, 
  Neomxnis 
  

   synagris, 
  July 
  15, 
  1910. 
  

  

  Type-specimen. 
  — 
  Cat. 
  No. 
  43598, 
  U.S.N.M. 
  Paratypes, 
  Cat. 
  No. 
  

   42279, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  oblong, 
  four 
  times 
  as 
  long 
  as 
  wide; 
  

   cephalothorax 
  ovate, 
  the 
  lateral 
  margins 
  projecting 
  anteriorly 
  in 
  

   the 
  form 
  of 
  a 
  short 
  knob 
  or 
  horn 
  on 
  either 
  side. 
  A 
  distinct 
  notch 
  in 
  

   each 
  margin 
  indicates 
  the 
  separation 
  of 
  the 
  antennal 
  area 
  from 
  the 
  

   rest 
  of 
  the 
  head, 
  but 
  there 
  is 
  no 
  transverse 
  groove. 
  Fused 
  second 
  

   and 
  third 
  segments 
  subquadrilateral, 
  with 
  parallel 
  sides 
  and 
  nearly 
  

   square 
  corners, 
  the 
  separation 
  of 
  the 
  two 
  segments 
  being 
  faintly 
  

   indicated 
  by 
  marginal 
  notches. 
  Dorsal 
  plate 
  of 
  the 
  fourth 
  segment 
  

   obovate, 
  the 
  posterior 
  margin 
  slightly 
  reentrant 
  at 
  the 
  center. 
  Third 
  

   legs 
  entirely 
  concealed 
  in 
  dorsal 
  view; 
  both 
  rami 
  of 
  the 
  fourth 
  pair 
  

   projecting 
  far 
  behind 
  the 
  dorsal 
  plate. 
  Fifth 
  segment 
  short 
  and 
  

   destitute 
  of 
  appendages; 
  genital 
  segment 
  also 
  short 
  and 
  narrow. 
  

  

  Abdomen 
  subquadrilateral, 
  the 
  same 
  length 
  and 
  width; 
  anal 
  

   laminae 
  as 
  long 
  as 
  the 
  genital 
  segment 
  and 
  abdomen, 
  stout, 
  with 
  their 
  

   tips 
  curved 
  away 
  from 
  each 
  other. 
  But 
  in 
  spite 
  of 
  their 
  length 
  

   they 
  only 
  reach 
  halfway 
  to 
  the 
  posterior 
  margin 
  of 
  the 
  fourth 
  dorsal 
  

   plate, 
  and 
  hence 
  this 
  extreme 
  posterior 
  portion 
  of 
  the 
  body 
  is 
  entirely 
  

   concealed 
  in 
  both 
  dorsal 
  and 
  ventral 
  views. 
  

  

  None 
  of 
  the 
  females 
  captured 
  carried 
  egg-strings 
  and 
  so 
  these 
  are 
  

   lmkno^vn. 
  

  

  