﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  215 
  

  

  and 
  lateral 
  border 
  without 
  color; 
  one 
  specimen 
  (collected 
  October 
  4, 
  

   1949) 
  was 
  noted 
  as 
  peach-colored 
  from 
  segment 
  10 
  posteriorly, 
  the 
  

   color 
  showing 
  mainly 
  on 
  the 
  ventral 
  side 
  and 
  extending 
  into 
  the 
  

   parapodia 
  (probably 
  developing 
  eggs). 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Point 
  Barrow 
  base, 
  washed 
  ashore, 
  

   1949 
  (July 
  30; 
  August 
  21; 
  September 
  22, 
  28, 
  30; 
  October 
  4, 
  5, 
  16, 
  

   17; 
  65 
  specimens); 
  off 
  Point 
  Barrow 
  base, 
  along 
  shore, 
  1.7 
  fms., 
  on 
  

   bottom 
  of 
  gravel 
  with 
  mud 
  (2 
  specimens). 
  East 
  Coast 
  North 
  

   America: 
  Off 
  Labrador, 
  45 
  fms., 
  Blue 
  Dolphin 
  Expedition, 
  1949. 
  

  

  Distribution.— 
  Widely 
  distributed 
  m 
  the 
  Arctic: 
  Siberian 
  and 
  

   Alaskan 
  Ai'ctic, 
  Davis 
  Strait, 
  Greenland, 
  Spitsbergen, 
  Franz 
  Josef 
  

   Land, 
  Kara 
  Sea. 
  Also 
  Bering 
  Sea; 
  off 
  Labrador. 
  In 
  1.7-111 
  

   fathoms. 
  

  

  Genus 
  Antinoe 
  Kinberg, 
  1855 
  (sensu 
  Malmgren, 
  1865) 
  

   Antinoe 
  sarsi 
  Malmgren, 
  1865 
  

  

  Antinoe 
  sarsi 
  Kinberg, 
  1862 
  (MS.), 
  p. 
  468 
  (fide 
  Malmgren, 
  1865).— 
  Malmgren, 
  

  

  1865, 
  p. 
  75, 
  pi. 
  9, 
  fig. 
  6 
  (part) 
  .—Mcintosh, 
  1900, 
  p. 
  365, 
  figs.— 
  Chamberlin, 
  

  

  1920, 
  p. 
  8. 
  — 
  Hartman, 
  1944a, 
  p. 
  334. 
  

   Polynoe 
  sarsi 
  Theel, 
  1879, 
  p. 
  16, 
  pi. 
  1, 
  fig. 
  8.— 
  Wir6n, 
  1883, 
  p. 
  390.— 
  Murdoch, 
  

  

  1885, 
  p. 
  152. 
  

   Harmothoe 
  sarsi 
  Eliason, 
  1920, 
  p. 
  20.— 
  Annenkova, 
  1931, 
  p. 
  203.— 
  Friedrich, 
  

  

  1939, 
  p. 
  122.— 
  Thorsou, 
  1946, 
  p. 
  48.— 
  Wesenberg-Lund, 
  1950a, 
  p. 
  7; 
  1950b, 
  

  

  p. 
  23; 
  1951, 
  p. 
  17. 
  

   Harmothoe 
  (Antinoella) 
  sarsi 
  Augener, 
  1928, 
  p. 
  687. 
  

   Antinoella 
  sarsi 
  Annenkova, 
  1937, 
  p. 
  153; 
  1938, 
  p. 
  137.— 
  Gorbunov, 
  1946, 
  p. 
  38.— 
  

  

  Zatsepin, 
  1948, 
  p. 
  107, 
  pi. 
  28, 
  fig. 
  8. 
  

   Description.— 
  Length. 
  21-68 
  mm., 
  width 
  mcluding 
  setae 
  11-27 
  mm. 
  

   Segments 
  37 
  or 
  38. 
  Fragments 
  easily, 
  posterior 
  segments 
  frequently 
  

   regenerating. 
  Body 
  elongate, 
  flattened, 
  tapering 
  shghtly 
  anteriorly 
  

   and 
  posteriorly. 
  Prostomium 
  with 
  cephalic 
  peaks 
  distinct 
  or 
  poorly 
  

   developed; 
  anterior 
  pan- 
  of 
  eyes 
  larger 
  than 
  posterior, 
  slightly 
  anterior 
  

   to 
  greatest 
  width 
  of 
  prostomium. 
  Antennae 
  with 
  short, 
  clavate 
  

   papillae. 
  Dorsal 
  cirri 
  extending 
  beyond 
  setae, 
  long, 
  slender, 
  tapering 
  

   gradually, 
  with 
  short, 
  clavate 
  papillae. 
  May 
  be 
  a 
  single 
  anal 
  ckrus, 
  

   extremely 
  long, 
  thick 
  at 
  base, 
  tapering 
  gradually; 
  may 
  be 
  one 
  long 
  

   and 
  one 
  short 
  anal 
  cirrus. 
  Elytra 
  large, 
  thin, 
  soft, 
  smooth, 
  with 
  

   scattered 
  microtubercles 
  and 
  short, 
  delicate, 
  clavate 
  papillae. 
  Lose 
  

   elytra 
  readily; 
  often 
  show 
  regenerating 
  elytra, 
  thus 
  appearing 
  variable 
  

   in 
  size. 
  Notopodia 
  and 
  neuropodia 
  extending 
  into 
  conspicuous, 
  

   digitiform, 
  acicular 
  lobes. 
  Setae 
  yellowish 
  or 
  golden. 
  Notosetae 
  

   much 
  thicker 
  than 
  neurosetae, 
  large, 
  clear 
  basally; 
  more 
  distally, 
  

   finely 
  spinous, 
  pointed. 
  Neurosetae 
  of 
  two 
  kinds, 
  with 
  capillary 
  tips 
  

   and 
  with 
  slender, 
  relatively 
  obtuse, 
  shghtly 
  curved 
  tips. 
  Color: 
  

   In 
  life 
  and 
  preserved: 
  Grayish 
  gi-een 
  or 
  light 
  brown 
  middorsally, 
  

  

  