﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  195 
  

  

  siderably 
  longer 
  than 
  the 
  basal 
  abdomen 
  joint 
  and 
  half 
  as 
  wide 
  as 
  

   the 
  terminal 
  joint, 
  enlarged 
  at 
  the 
  tip 
  and 
  armed 
  with 
  two 
  large 
  

   setae, 
  the 
  inner 
  of 
  which 
  is 
  four 
  times 
  the 
  length 
  of 
  the 
  outer. 
  Egg- 
  

   cases 
  cylindrical, 
  as 
  long 
  as 
  the 
  entire 
  body 
  and 
  twice 
  the 
  diameter 
  

   of 
  the 
  genital 
  segment; 
  eggs 
  rather 
  small, 
  in 
  five 
  or 
  six 
  longitudinal 
  

   rows, 
  from 
  20 
  to 
  25 
  in 
  each 
  row. 
  

  

  First 
  antennse 
  short, 
  only 
  reaching 
  the 
  center 
  of 
  the 
  basal 
  joint 
  of 
  

   the 
  second 
  pair, 
  and 
  sparsely 
  armed 
  with 
  setae. 
  

  

  Second 
  antennae 
  stout 
  and 
  two-thirds 
  the 
  length 
  of 
  the 
  cephalotho- 
  

   rax; 
  basal 
  joint 
  moderately 
  enlarged, 
  the 
  remainder 
  of 
  the 
  appendage 
  

   tapering 
  regularly, 
  with 
  a 
  small 
  knob 
  on 
  the 
  inner 
  margin 
  of 
  the 
  penul- 
  

   timate 
  joint 
  close 
  to 
  the 
  base 
  of 
  the 
  terminal 
  claw; 
  the 
  latter 
  with 
  

   two 
  small 
  teeth 
  on 
  its 
  inner 
  margin 
  near 
  the 
  center. 
  

  

  Labrum 
  only 
  indistmctly 
  visible; 
  mandibles 
  large 
  and 
  stout, 
  the 
  

   terminal 
  blade 
  broad 
  and 
  armed 
  with 
  setae 
  around 
  its 
  entire 
  margin; 
  

   palps 
  very 
  narrow 
  and 
  needle-like, 
  as 
  long 
  as 
  the 
  terminal 
  blade 
  and 
  

   with 
  a 
  row 
  of 
  fine 
  teeth 
  along 
  their 
  outer 
  margin; 
  first 
  maxillae 
  small, 
  

   not 
  projecting 
  much, 
  and 
  armed 
  with 
  two 
  small 
  plumose 
  setae; 
  second 
  

   maxillae 
  rather 
  large, 
  but 
  with 
  small 
  terminal 
  joints, 
  which 
  overlap 
  at 
  

   the 
  midline 
  and 
  are 
  heavily 
  armed 
  with 
  setae; 
  no 
  visible 
  traces 
  of 
  the 
  

   maxillipeds. 
  

  

  The 
  first 
  three 
  pairs 
  of 
  swimming 
  legs 
  with 
  three-jointed 
  rami, 
  the 
  

   exopod 
  of 
  the 
  fourth 
  pair 
  with 
  two 
  joints 
  only; 
  the 
  arrangement 
  of 
  

   the 
  spines 
  and 
  setae 
  as 
  follows: 
  First 
  exopod, 
  I 
  — 
  0, 
  1 
  — 
  0, 
  — 
  ^6; 
  endo- 
  

   pod, 
  0—1, 
  0—2, 
  0—5. 
  Second 
  exopod, 
  I 
  — 
  0, 
  I— 
  1, 
  0—6; 
  endopod, 
  

   I— 
  1, 
  0—2, 
  0—6. 
  Third 
  exopod, 
  I— 
  0, 
  I— 
  1, 
  0—5; 
  endopod, 
  I— 
  1, 
  

   0—2, 
  0—6. 
  Fourth 
  exopod, 
  I— 
  0, 
  0—5; 
  endopod, 
  I— 
  1, 
  1—2, 
  0—5. 
  

  

  Color 
  a 
  uniform 
  cartilage 
  gray 
  without 
  pigment 
  or 
  markings 
  of 
  any 
  

   sort. 
  

  

  Total 
  length, 
  0.95 
  mm. 
  Cephalothorax, 
  0.7 
  mm. 
  long, 
  0.4 
  mm. 
  

   wide. 
  Egg-strings, 
  0.9 
  mm. 
  long, 
  0.18 
  mm. 
  wide. 
  

  

  (fiuKTTjpodsv 
  , 
  out 
  of 
  the 
  nose.) 
  

  

  This 
  new 
  species 
  may 
  be 
  distinguished 
  from 
  others 
  by 
  the 
  elongate 
  

   eUiptical 
  shape 
  of 
  the 
  cephalothorax, 
  by 
  the 
  extreme 
  shortness 
  of 
  

   the 
  body 
  behind 
  the 
  cephalothorax 
  (see 
  above 
  measurements), 
  by 
  

   the 
  great 
  length 
  and 
  uniform 
  diameter 
  of 
  the 
  egg-cases, 
  and 
  by 
  the 
  

   thickness 
  of 
  the 
  "neck" 
  of 
  the 
  mandible, 
  the 
  width 
  of 
  its 
  cutting 
  

   blade, 
  and 
  the 
  linear 
  form 
  of 
  its 
  palp. 
  

  

  BOMOLOCHUS 
  NOTHRUS, 
  new 
  species. 
  

   Plates 
  19 
  and 
  20. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Fifteen 
  specimens, 
  including 
  both 
  

   sexes, 
  were 
  obtained 
  from 
  the 
  gill 
  cavity 
  of 
  the 
  httle 
  fish 
  locally 
  

   known 
  as 
  *'sheepshead," 
  Abudefduf 
  saxatilis, 
  on 
  September 
  5. 
  

  

  