﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  289 
  

  

  Genus 
  Flabelligera 
  Sars, 
  1829 
  

  

  Flabelligera 
  affinis 
  Sars, 
  1829 
  

   Figure 
  33, 
  e~g 
  

  

  Flabelligera 
  affinis 
  Sars, 
  1829, 
  p. 
  31, 
  pi. 
  3, 
  fig. 
  16 
  (fide 
  Malmgren, 
  1867). 
  — 
  Malmgren, 
  

   1867, 
  p. 
  83.— 
  Chamberlin, 
  1920, 
  p. 
  21.— 
  Eliason, 
  1920, 
  p. 
  62.— 
  Fauvel, 
  1927, 
  

   p. 
  113, 
  fig. 
  40, 
  a-f.— 
  Augener, 
  1928, 
  p. 
  768.— 
  Monro, 
  1930, 
  p. 
  160, 
  fig. 
  63; 
  

   1936, 
  p. 
  164.— 
  Annenkova, 
  1937, 
  p. 
  174; 
  1938, 
  p. 
  184.— 
  Berkeley 
  and 
  Berkeley, 
  

   1943, 
  p. 
  130.— 
  Hartman, 
  1944a, 
  pp. 
  335, 
  341, 
  pi. 
  33, 
  figs. 
  12, 
  13 
  (as 
  ?Brada 
  

   setosa 
  Verrill). 
  — 
  Gorbunov, 
  1946, 
  p. 
  39. 
  — 
  Zatsepin, 
  1948, 
  p. 
  134, 
  pi. 
  33, 
  fig. 
  

   1.— 
  St0p-Bowitz, 
  1948a, 
  p. 
  8, 
  fig. 
  1; 
  1948b, 
  p. 
  30.— 
  Wesenberg-Lund, 
  1950a, 
  

   p. 
  35; 
  1950b, 
  p. 
  82; 
  1951, 
  p. 
  76. 
  

  

  Flabelligera 
  infundibularis 
  Johnson, 
  1901, 
  p. 
  417, 
  pi. 
  12, 
  figs. 
  124-127. 
  — 
  Hartman, 
  

   1938c, 
  p. 
  14; 
  1948, 
  p. 
  40.— 
  Berkeley 
  and 
  Berkeley, 
  1952, 
  p. 
  7, 
  figs. 
  1-4. 
  

  

  Flabelligera 
  infundibularum 
  Moore, 
  1923, 
  p. 
  223. 
  

  

  Flabelligera 
  infundibuliformis 
  Hartman 
  and 
  Reish, 
  1950, 
  p. 
  35. 
  

  

  Description. 
  — 
  Length 
  up 
  to 
  130 
  mm., 
  width 
  including 
  mantle 
  12-15 
  

   mm., 
  segments 
  up 
  to 
  7 
  1 
  . 
  Body 
  rounded, 
  attenuated 
  shghtly 
  anteriorly 
  

   and 
  more 
  so 
  posteriorly. 
  Body 
  covered 
  with 
  numerous 
  papillae 
  

   which 
  are 
  elongate, 
  thin, 
  flexible, 
  usually 
  somewhat 
  coiled, 
  with 
  larger 
  

   bulbous 
  tips 
  quite 
  variable 
  in 
  shape. 
  Body 
  usually 
  covered 
  with 
  

   thick, 
  mucous, 
  transparent 
  mantle 
  (may 
  be 
  missing 
  in 
  smaU 
  speci- 
  

   mens 
  or 
  specimens 
  appearing 
  in 
  surface 
  waters) 
  which 
  is 
  penetrated 
  

   by 
  the 
  pedunculate 
  papillae. 
  Fused 
  prostomium 
  and 
  buccal 
  segment 
  

   retractile 
  within 
  anterior 
  setiger, 
  with 
  pair 
  of 
  stout, 
  grooved 
  palps, 
  

   two 
  groups 
  of 
  numerous 
  filiform 
  branchiae, 
  two 
  pairs 
  of 
  eyes 
  (almost 
  

   coalesced), 
  and 
  somewhat 
  protruding 
  buccal 
  siphon 
  around 
  ventral 
  

   mouth 
  opening. 
  First 
  setigerous 
  segment 
  with 
  wide, 
  funneUike 
  

   depression 
  into 
  which 
  buccal 
  siphon, 
  etc., 
  can 
  mostly 
  be 
  withdrawn; 
  

   with 
  circlet 
  of 
  elongated, 
  ringed 
  setae 
  around 
  margin 
  and 
  directed 
  

   forward 
  or 
  spread 
  fimnellike, 
  forming 
  cephalic 
  cage; 
  with 
  numerous 
  

   elongate 
  papillae 
  having 
  slender 
  straight 
  peduncles 
  and 
  fusiform 
  tips. 
  

   Notopodia 
  conical, 
  diagonally 
  truncate 
  lobes, 
  with 
  capillary 
  ringed 
  

   setae, 
  with 
  elongate 
  papillae 
  on 
  posterior 
  side 
  that 
  may 
  be 
  up 
  to 
  three- 
  

   fourths 
  length 
  of 
  notosetae 
  (similar 
  in 
  shape 
  to 
  those 
  around 
  cephalic 
  

   cage; 
  different 
  from 
  those 
  on 
  body). 
  Neuropodia 
  conical, 
  each 
  with 
  

   usually 
  one 
  (sometimes 
  two) 
  large, 
  hooked, 
  amber-colored 
  pseudo- 
  

   compoimd 
  seta, 
  ringed 
  basaUy, 
  hooked 
  tips 
  dark 
  to 
  black. 
  When 
  

   mucous 
  mantle 
  is 
  present, 
  setae 
  almost 
  completely 
  embedded 
  and 
  the 
  

   hooked 
  tips 
  of 
  neurosetae 
  and 
  capillary 
  tips 
  of 
  notosetae 
  only 
  ex- 
  

   tending 
  beyond 
  mantle. 
  Pygidium 
  a 
  fleshy, 
  rounded 
  rim; 
  anus 
  

   subdorsal. 
  Color: 
  In 
  alcohol: 
  Without 
  color 
  or 
  slightly 
  reddish 
  

   brown. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  West 
  side 
  Elson 
  Lagoon 
  near 
  en- 
  

   trance 
  to 
  small 
  lagoon 
  to 
  west, 
  1.2 
  fms.; 
  Point 
  Barrow 
  base, 
  washed 
  

   ashore; 
  off 
  Point 
  Barrow 
  base, 
  18.3-123.5 
  fms., 
  on 
  various 
  combina- 
  

  

  