﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  287 
  

  

  shore, 
  13.3-75.5 
  fms., 
  on 
  bottoms 
  of 
  stones, 
  and 
  various 
  combinations 
  

   of 
  mud, 
  pebbles, 
  rock, 
  stones, 
  gravel, 
  large 
  perforated 
  rocks, 
  with 
  

   bryozoans, 
  embedded 
  in 
  mud 
  at 
  bases 
  of 
  barnacles 
  and 
  bryozoans 
  as 
  

   Eucratea 
  loricata 
  (19 
  stations, 
  183 
  specimens). 
  Siberia: 
  Plover 
  Bay, 
  

   10-35 
  fms., 
  Dall, 
  1880. 
  Bering 
  Sea: 
  Albatross 
  station, 
  Nikolski, 
  

   Bering 
  Island, 
  1892; 
  St. 
  George 
  Island, 
  Pribilofs, 
  2 
  miles 
  off 
  shore, 
  

   40 
  fms., 
  Hanna, 
  1913; 
  Atka 
  Island, 
  Aleutians, 
  L. 
  M. 
  Turner, 
  1879. 
  

   West 
  Coast 
  North 
  America: 
  Strait 
  of 
  Juan 
  de 
  Fuca, 
  Washington 
  

   and 
  Puget 
  Sounds, 
  low 
  water, 
  Pettibone. 
  East 
  Coast 
  North 
  Amer- 
  

   ica: 
  Off 
  Labrador, 
  95 
  fms.. 
  Blue 
  Dolphin 
  Expedition, 
  1949; 
  oil 
  Maine, 
  

   Massachusetts, 
  low 
  water 
  to 
  67 
  fms., 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Arctic: 
  Siberian, 
  Alaskan, 
  

   and 
  Canadian 
  Arctic, 
  Greenland, 
  Spitsbergen, 
  Barents 
  Sea, 
  Novaya 
  

   Zemlya. 
  Also 
  Iceland, 
  Faroes, 
  Norway 
  to 
  France, 
  Canary 
  Islands; 
  

   Hudson 
  Bay 
  to 
  Massachusetts; 
  Bering 
  Sea 
  to 
  Mexico; 
  north 
  Japan 
  

   Sea 
  to 
  Japan, 
  Manchuria. 
  Southern 
  latitudes: 
  Falkland 
  Islands, 
  

   Magellan 
  Straits, 
  South 
  Georgia, 
  Kerguelen. 
  In 
  low 
  water 
  to 
  1,611 
  

   fathoms. 
  

  

  Genus 
  Chaetozone 
  Malmgren, 
  1867 
  

  

  Chaetozone 
  setosa 
  Malmgren, 
  1867 
  

  

  Figure 
  33, 
  d 
  

  

  Chaetozone 
  setosa 
  Malmgren, 
  1867, 
  p. 
  96, 
  pi. 
  14, 
  fig. 
  84. 
  — 
  Th^el, 
  1879, 
  p. 
  54, 
  pi. 
  

   4, 
  figs. 
  49-51.— 
  Fauvel, 
  1914, 
  p. 
  217, 
  pi. 
  20, 
  fig. 
  1; 
  1927, 
  p. 
  101, 
  fig. 
  35; 
  

   1934a, 
  p. 
  47.— 
  Eliason, 
  1920, 
  p. 
  57. 
  — 
  Augener, 
  1928, 
  p. 
  750. 
  — 
  Gustafson, 
  

   1936, 
  p. 
  8.— 
  Monro, 
  1937, 
  p. 
  301.— 
  Annenkova, 
  1937, 
  p. 
  174; 
  1938, 
  p. 
  182.— 
  

   Berkeley 
  and 
  Berkeley, 
  1942, 
  p. 
  197; 
  1952, 
  p. 
  35, 
  fig. 
  63.— 
  Hartman, 
  1944a, 
  

   pp. 
  334, 
  341.— 
  Zatsepin, 
  1948, 
  p. 
  133, 
  pi. 
  32, 
  fig. 
  16.— 
  Wesenberg-Lund, 
  

   1950a, 
  p. 
  34; 
  1950b, 
  p. 
  81; 
  1951, 
  p. 
  75. 
  

  

  Description. 
  — 
  Length 
  up 
  to 
  25 
  mm., 
  width 
  2 
  mm. 
  Prostomium 
  

   conical, 
  acutely 
  pointed, 
  without 
  eyes. 
  Buccal 
  segment 
  and 
  two 
  

   following 
  achaetous 
  segments 
  more 
  or 
  less 
  fused; 
  in 
  specimens 
  from 
  

   Point 
  Barrow, 
  buccal 
  segment 
  fused 
  with 
  prostomium, 
  second 
  and 
  

   third 
  segments 
  fused 
  dorsally. 
  Paired 
  palps 
  large, 
  long, 
  grooved, 
  

   inserted 
  just 
  anterior 
  to 
  first 
  setigerous 
  segment, 
  deciduous, 
  often 
  

   missing 
  on 
  preserved 
  specimens 
  and 
  missing 
  when 
  in 
  epitokous 
  phase. 
  

   Branchial 
  filaments 
  begin 
  just 
  anterior 
  to 
  first 
  setigerous 
  segment, 
  

   immediately 
  posterior 
  to 
  palps, 
  continuing 
  on 
  large 
  number 
  of 
  anterior 
  

   segments, 
  lacking 
  on 
  posterior 
  region, 
  readily 
  deciduous, 
  inserted 
  just 
  

   posterior 
  to 
  upper 
  part 
  of 
  parapodial 
  tori. 
  Parapodia 
  are 
  slightly 
  

   projecting 
  tori 
  common 
  to 
  both 
  noto- 
  and 
  neuropodia. 
  In 
  anterior 
  

   region, 
  both 
  lobes 
  with 
  long, 
  delicate 
  capillary 
  setae; 
  more 
  posteriorly, 
  

   notopodia 
  with 
  still 
  longer 
  capillary 
  setae, 
  neuropodia 
  with 
  shorter, 
  

   stouter 
  capillary 
  setae 
  and 
  short, 
  unidentate 
  acicular 
  crotchets; 
  more 
  

   posteriorly, 
  with 
  acicular 
  crotchets 
  in 
  both 
  noto- 
  and 
  neuropodia. 
  

  

  