﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OP 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  263 
  

  

  straight 
  line 
  with 
  the 
  arms 
  and 
  about 
  the 
  same 
  length 
  as 
  the 
  latter. 
  

   Head 
  half 
  as 
  wide 
  again 
  as 
  tne 
  neck, 
  nearly 
  cylindrical, 
  and 
  covered 
  

   on 
  the 
  dorsal 
  surface 
  with 
  a 
  skin-like 
  carapace, 
  which 
  does 
  not 
  

   reach 
  the 
  anterior 
  margin; 
  neck 
  the 
  same 
  diameter 
  as 
  the 
  arms. 
  

   Body 
  oval, 
  strongly 
  flattened 
  dorso-ventrally, 
  with 
  the 
  dorsal 
  surface 
  

   concave 
  or 
  saucer-shaped 
  and 
  its 
  raised 
  margm 
  crenulate. 
  One 
  

   jiair 
  of 
  thick 
  cylindrical 
  processes 
  at 
  the 
  posterior 
  end, 
  on 
  a 
  level 
  

   with 
  the 
  dorsal 
  surface 
  and 
  well 
  separated. 
  These 
  processes 
  are 
  

   narrowed 
  to 
  a 
  short 
  neck 
  anteriorly 
  and 
  bluntly 
  rounded 
  poste- 
  

   riorly. 
  The)'' 
  start 
  on 
  either 
  side 
  of 
  the 
  dorsal 
  midline 
  and 
  close 
  to 
  

   it, 
  and 
  run 
  a 
  short 
  distance 
  at 
  right 
  angles 
  to 
  the 
  body 
  axis, 
  then 
  

   turn 
  and 
  become 
  parallel 
  with 
  the 
  latter 
  and 
  with 
  each 
  other. 
  

  

  The 
  abdomen 
  and 
  anal 
  laminae 
  are 
  both 
  lacking. 
  The 
  egg-strings 
  

   are 
  cylindrical, 
  the 
  same 
  diameter 
  as 
  the 
  posterior 
  processes, 
  and 
  

   twice 
  as 
  long 
  as 
  the 
  body 
  proper; 
  the 
  eggs 
  are 
  arranged 
  in 
  four 
  or 
  

   five 
  longitudinal 
  rows, 
  about 
  50 
  in 
  a 
  row. 
  

  

  First 
  antennae 
  very 
  indistinctly 
  segmented, 
  the 
  basal 
  segments 
  

   much 
  larger 
  than 
  the 
  terminal, 
  the 
  whole 
  appendage 
  turned 
  over 
  ven- 
  

   trally 
  nearly 
  at 
  right 
  angles 
  to 
  the 
  dorsal 
  surface. 
  Second 
  antennae 
  

   appressed 
  to 
  the 
  anterior 
  margin 
  of 
  the 
  head, 
  not 
  meeting 
  at 
  the 
  

   midline, 
  but 
  leaving 
  a 
  gap 
  equal 
  in 
  width 
  to 
  the 
  diameter 
  of 
  the 
  

   antennae. 
  Proboscis 
  projecting 
  slightly 
  m 
  front 
  of 
  the 
  head, 
  between 
  

   the 
  ends 
  of 
  the 
  second 
  antennae. 
  

  

  First 
  maxillae 
  short 
  and 
  stout, 
  not 
  reaching 
  beyond 
  the 
  center 
  of 
  

   the 
  mouth 
  tube, 
  with 
  thi'ee 
  terminal 
  spines 
  of 
  about 
  equal 
  length; 
  

   palp 
  at 
  the 
  center 
  of 
  the 
  inner 
  margin, 
  tipped 
  with 
  two 
  short 
  spines. 
  

   Second 
  maxillae 
  about 
  as 
  long 
  as 
  the 
  head 
  and 
  neck, 
  separate 
  to 
  the 
  

   very 
  ends, 
  where 
  they 
  are 
  slightly 
  enlarged 
  and 
  fused 
  into 
  a 
  rounded 
  

   knob 
  which 
  supports 
  the 
  bell-shaped 
  bulla. 
  

  

  Maxillipeds 
  with 
  a 
  swollen 
  basal 
  joint, 
  armed 
  on 
  the 
  inner 
  margin 
  

   near 
  the 
  base 
  with 
  a 
  rounded 
  knob 
  covered 
  with 
  short 
  spines, 
  and 
  a 
  

   long 
  flexible 
  spine 
  at 
  the 
  center; 
  terminal 
  claw 
  short 
  and 
  weak, 
  with 
  

   an 
  accessory 
  spine 
  at 
  its 
  base. 
  

  

  Color 
  of 
  the 
  head 
  and 
  neck 
  a 
  clear 
  cartilage 
  gray, 
  the 
  body 
  yel- 
  

   lowish, 
  the 
  complicated 
  uterine 
  processes 
  of 
  the 
  oviducts 
  white; 
  

   egg-strings 
  straw-yellow, 
  becoming 
  deeper 
  as 
  the 
  eggs 
  develop. 
  

  

  Total 
  length, 
  without 
  the 
  egg-strings 
  and 
  posterior 
  processes, 
  

   11 
  mm. 
  Cephalothorax, 
  6.2 
  mm. 
  long, 
  1.4 
  mra. 
  wide. 
  Arms, 
  5 
  mm. 
  

   long. 
  Posterior 
  processes, 
  3.2 
  mm. 
  long. 
  Egg-strings, 
  7.25 
  mm. 
  

  

  (concava, 
  hollowed 
  out, 
  alluding 
  to 
  the 
  dorsal 
  surface 
  of 
  the 
  body.) 
  

  

  This 
  species 
  is 
  one 
  of 
  those 
  that 
  have 
  but 
  two 
  posterior 
  processes, 
  

   and 
  among 
  them 
  may 
  be 
  recognized 
  by 
  the 
  size 
  and 
  shape 
  of 
  those 
  

   processes, 
  as 
  well 
  as 
  by 
  the 
  large 
  size 
  of 
  the 
  parasite 
  itself. 
  It 
  is 
  not 
  

   common, 
  since 
  a 
  large 
  number 
  of 
  sting 
  rays 
  yielded 
  but 
  this 
  one 
  

   specimen. 
  

  

  