﻿NO. 
  19r,0. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WILSOX. 
  265 
  

  

  Anal 
  laminse 
  much 
  shorter 
  than 
  the 
  terminal 
  segment 
  and 
  thickset, 
  

   each 
  armed 
  with 
  three 
  short 
  spines 
  at 
  the 
  outer 
  distal 
  corner 
  and 
  two 
  

   similar 
  ones 
  at 
  the 
  inner 
  distal 
  corner. 
  Between 
  these 
  on 
  the 
  end 
  of 
  

   each 
  lamina 
  is 
  attached 
  a 
  stout 
  seta 
  five-ninths 
  as 
  long 
  as 
  the 
  entire 
  

   body; 
  each 
  seta 
  is 
  curved 
  outward 
  at 
  the 
  center, 
  the 
  two 
  resembling 
  

   a 
  pair 
  of 
  parenthesis 
  marks. 
  

  

  Anterior 
  antennee 
  indistinctly 
  eight-jointed, 
  considerably 
  shorter 
  

   than 
  the 
  cephalon, 
  and 
  thickset; 
  the 
  four 
  basal 
  joints 
  are 
  well 
  sup- 
  

   plied 
  with 
  setoe 
  of 
  moderate 
  size, 
  on 
  the 
  four 
  terminal 
  joints 
  the 
  

   setae 
  are 
  scattering, 
  except 
  a 
  tuft 
  at 
  the 
  very 
  tip; 
  the 
  fourth 
  joint 
  

   projects 
  somewhat 
  on 
  the 
  anterior 
  margin 
  and 
  is 
  there 
  armed 
  with 
  

   two 
  long 
  and 
  narrow 
  sesthetasks. 
  

  

  The 
  posterior 
  antennae 
  are 
  of 
  moderate 
  size, 
  the 
  basal 
  joint 
  with 
  a 
  

   single 
  small 
  spine 
  on 
  its 
  inner 
  margin 
  ; 
  exopod 
  attached 
  at 
  the 
  center 
  

   of 
  the 
  outer 
  margin, 
  short, 
  one-jointed, 
  and 
  terminating 
  in 
  three 
  

   setae, 
  the 
  longest 
  of 
  which 
  is 
  posterior; 
  terminal 
  joint 
  two- 
  thirds 
  

   the 
  length 
  of 
  the 
  basal, 
  armed 
  with 
  a 
  double 
  row 
  of 
  saw 
  teeth 
  (prox- 
  

   imal 
  portion) 
  and 
  three 
  toothed 
  spines 
  (distal 
  portion) 
  along 
  its 
  inner 
  

   margin; 
  three 
  long 
  spines 
  toothed 
  near 
  their 
  tips, 
  and 
  a 
  shorter 
  one 
  

   toothed 
  at 
  its 
  center, 
  are 
  attached 
  to 
  the 
  distal 
  margin 
  of 
  this 
  terminal 
  

   joint. 
  

  

  Mandibles 
  pecuhar, 
  the 
  outer 
  ramus 
  very 
  small, 
  simple, 
  one-jointed, 
  

   and 
  terminating 
  in 
  two 
  long 
  and 
  two 
  short 
  spines, 
  the 
  two 
  former 
  

   between 
  the 
  two 
  latter; 
  inner 
  ramus 
  flattened 
  into 
  a 
  semicvhndrical 
  

   lamina 
  or 
  blade, 
  the 
  distal 
  end 
  of 
  which 
  is 
  narrower 
  than 
  the 
  basal; 
  

   cutting 
  portion 
  projecting 
  from 
  the 
  inner 
  surface 
  of 
  this 
  lamina 
  at 
  

   the 
  distal 
  end 
  as 
  a 
  short, 
  sharp, 
  and 
  toothed 
  process. 
  The 
  concave 
  

   surfaces 
  of 
  the 
  laminae 
  face 
  each 
  other 
  so 
  that, 
  when 
  the 
  mandibles 
  

   are 
  closed 
  together, 
  the 
  laminae 
  form 
  a 
  short 
  conical 
  tube 
  or 
  proboscis, 
  

   through 
  which 
  liquid 
  food 
  might 
  well 
  be 
  conveyed 
  to 
  the 
  mouth. 
  

  

  First 
  maxillae 
  with 
  an 
  exopod 
  made 
  up 
  of 
  one 
  stout 
  curved 
  spine 
  and 
  

   two 
  smaller 
  ones; 
  endopod 
  a 
  flattened 
  lamina, 
  terminated 
  by 
  a 
  row 
  

   of 
  short 
  spines. 
  Second 
  maxillae 
  with 
  a 
  stout 
  exopod 
  terminatmg 
  

   in 
  a 
  long 
  curved 
  claw; 
  endopod 
  shorter, 
  with 
  a 
  tuft 
  of 
  small 
  spines 
  

   at 
  the 
  end. 
  

  

  Maxillipeds 
  with 
  a 
  short 
  and 
  stout 
  basal 
  joint, 
  a 
  swollen 
  second 
  

   joint, 
  and 
  a 
  slender 
  terminal 
  claw, 
  curved 
  to 
  fit 
  the 
  surface 
  of 
  the 
  

   second 
  joint 
  and 
  toothed 
  along 
  its 
  inner 
  margin. 
  First 
  four 
  pairs 
  of 
  

   legs 
  biramose; 
  endopod 
  of 
  the 
  first 
  pair 
  twice 
  the 
  length 
  of 
  the 
  

   exopod, 
  two-jointed, 
  the 
  basal 
  joint 
  almost 
  four 
  times 
  as 
  long 
  as 
  the 
  

   terminal, 
  the 
  latter 
  ending 
  in 
  a 
  stout 
  claw 
  and 
  a 
  long 
  slender 
  seta, 
  the 
  

   former 
  with 
  a 
  long 
  seta 
  on 
  its 
  ventral 
  surface 
  and 
  a 
  shorter 
  one 
  on 
  

   its 
  outer 
  margin. 
  Exopod 
  of 
  first 
  pair 
  and 
  both 
  rami 
  of 
  the 
  second, 
  

   third, 
  and 
  fourth 
  legs 
  three- 
  jointed, 
  the 
  spines 
  and 
  setae 
  arranged 
  

  

  