﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  259 
  

  

  Exogone 
  dispar 
  (Webster, 
  1879) 
  

  

  Figure 
  28, 
  k 
  

  

  Paedophylax 
  dispar 
  Webster, 
  1879a, 
  p. 
  223, 
  pi. 
  4, 
  fig. 
  49; 
  pi. 
  5, 
  figs. 
  50-55; 
  1879b, 
  

  

  p. 
  110; 
  1886, 
  p. 
  138.— 
  Sumner, 
  1913, 
  p. 
  615. 
  

   Paedophylax 
  longiceps 
  Verrill, 
  1879, 
  p. 
  170; 
  1881, 
  p. 
  320, 
  pi. 
  12, 
  fig. 
  2; 
  1882, 
  p. 
  

  

  370.— 
  Andrews, 
  1891, 
  p. 
  281. 
  

   Paedophylax 
  longicirris 
  Webster 
  and 
  Benedict, 
  1887, 
  p. 
  722, 
  pi. 
  3, 
  figs. 
  46-50. 
  

   Exogone 
  lourei 
  Berkeley 
  and 
  Berkeley, 
  1938, 
  p. 
  44, 
  figs. 
  6-12; 
  1948, 
  p. 
  79, 
  fig. 
  117.— 
  

  

  Rioja, 
  1941, 
  p. 
  703, 
  pi. 
  3, 
  figs. 
  14-21; 
  1943, 
  p. 
  224. 
  

   Exogone 
  dispar 
  Hartman, 
  1942a, 
  p. 
  11; 
  1944a, 
  p. 
  338, 
  pi. 
  24, 
  fig. 
  9; 
  pi. 
  25, 
  fig. 
  5; 
  

  

  1945, 
  p. 
  16, 
  pi. 
  2, 
  figs. 
  7, 
  9, 
  10; 
  1951, 
  p. 
  40. 
  

  

  Description. 
  — 
  Anterior 
  ends 
  of 
  3 
  specimens 
  only 
  (up 
  to 
  8 
  mm. 
  long, 
  

   45 
  setigers 
  — 
  Berkeley 
  and 
  Berkeley, 
  1938). 
  Palps 
  form 
  a 
  conical 
  

   mass, 
  about 
  twice 
  length 
  of 
  prostomium. 
  Antennae 
  inserted 
  between 
  

   and 
  slightly 
  in 
  front 
  of 
  eyes; 
  median 
  antenna 
  longer, 
  usually 
  reaching 
  

   nearly 
  to 
  end 
  of 
  palps 
  (may 
  be 
  not 
  much 
  longer 
  than 
  prostomium), 
  

   lateral 
  antennae 
  short, 
  ovoid. 
  Tentacular 
  cirri 
  slightly 
  smaller 
  than 
  

   lateral 
  antennae 
  and 
  dorsal 
  cirri. 
  Dorsal 
  cirri 
  present 
  on 
  all 
  setigerous 
  

   segments, 
  including 
  setiger 
  2, 
  Neurosetae 
  on 
  each 
  parapodium 
  con- 
  

   sisting 
  of 
  one 
  simple 
  curved 
  upper 
  seta 
  (may 
  have 
  a 
  delicate 
  thread 
  

   coming 
  off 
  subterminally 
  in 
  some 
  specimens), 
  one 
  to 
  four 
  composite 
  

   setae 
  with 
  long 
  terminal 
  capillary 
  blades, 
  and 
  three 
  to 
  nine 
  composite 
  

   setae 
  with 
  short, 
  hooked 
  blades. 
  

  

  Remarks. 
  — 
  The 
  specimens 
  were 
  compared 
  with 
  the 
  cotypes 
  of 
  

   Paedophylax 
  dispar 
  from 
  New 
  Jersey. 
  The 
  types 
  of 
  P. 
  longicirris 
  

   Webster 
  and 
  Benedict 
  from 
  Eastport, 
  Maine, 
  were 
  examined 
  also 
  

   and 
  the 
  peculiar 
  hairlike 
  process 
  on 
  some 
  of 
  the 
  simple 
  setae 
  was 
  

   noted. 
  This 
  also 
  occurs 
  on 
  some 
  of 
  the 
  simple 
  setae 
  of 
  the 
  specimens 
  

   from 
  Point 
  Barrow. 
  P. 
  longiceps 
  Verrill 
  has 
  previously 
  been 
  referred 
  

   to 
  P. 
  dispar 
  by 
  Sumner 
  (1913). 
  The 
  description 
  of 
  E. 
  lourei 
  Berkeley 
  

   and 
  Berkeley 
  from 
  British 
  Columbia 
  agrees 
  with 
  that 
  of 
  E. 
  dispar. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  36-70 
  fms., 
  

   up 
  to 
  7.5 
  miles 
  from 
  shore, 
  on 
  bottoms 
  of 
  stones, 
  gravel, 
  large 
  per- 
  

   forated 
  rocks 
  (2 
  stations, 
  3 
  specimens) 
  . 
  West 
  Coast 
  North 
  America: 
  

   Strait 
  of 
  Juan 
  de 
  Fuca, 
  Washington, 
  shore, 
  Pettibone, 
  1940. 
  East 
  

   Coast 
  North 
  America: 
  Woods 
  Hole 
  region, 
  Massachusetts, 
  Petti- 
  

   bone, 
  1950, 
  1951. 
  Maine, 
  Massachusetts, 
  New 
  Jersey, 
  low 
  water 
  to 
  

   14 
  fms., 
  U. 
  S, 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Arctic 
  Alaska 
  to 
  Mexico; 
  Maine 
  to 
  southwestern 
  

   Florida. 
  In 
  low 
  water 
  to 
  70 
  fathoms; 
  sexual 
  stages 
  at 
  surface. 
  

  

  Genus 
  Eusyllis 
  Malmgren, 
  1867 
  

  

  Both 
  species 
  represented 
  are 
  flattened 
  ventrally, 
  arched 
  dorsally, 
  

   tapering 
  both 
  anteriorly 
  and 
  posteriorly, 
  very 
  fragile, 
  breaking 
  up 
  

  

  