﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  255 
  

  

  off 
  (not 
  to 
  be 
  confused 
  with 
  simple 
  setae). 
  Color: 
  In 
  alcohol: 
  (1) 
  

   pigmented 
  with 
  reddish-brown, 
  one 
  wide 
  band 
  per 
  segment 
  (darker 
  

   on 
  posterior 
  part 
  of 
  band) 
  ; 
  more 
  posteriorly 
  two 
  bands 
  per 
  segment, 
  

   lighter 
  anterior 
  and 
  darker 
  posterior 
  ones; 
  then 
  one 
  band 
  per 
  segment; 
  

   then 
  without 
  color 
  (when 
  mature, 
  banded 
  color 
  pattern 
  on 
  the 
  seg- 
  

   ments 
  of 
  the 
  developing 
  sexual 
  stolon); 
  (2) 
  colorless, 
  particularly 
  in 
  

   small 
  specimens; 
  (3) 
  uniform 
  brown 
  mottling 
  on 
  anterior 
  third 
  of 
  

   body 
  (specimens 
  from 
  Washington). 
  In 
  life: 
  Reddish 
  rusty 
  brown 
  

   bands, 
  one 
  wide 
  band 
  or 
  two 
  narrower 
  bands 
  per 
  segment, 
  especially 
  

   on 
  the 
  anterior 
  fourth 
  and 
  posterior 
  fourth 
  (latter 
  a 
  developing 
  stolon, 
  

   with 
  wide, 
  orange-red 
  bands). 
  One 
  specimen 
  with 
  developing 
  stolon 
  

   beginning 
  on 
  segment 
  71. 
  

  

  Sexual 
  stolons 
  (Chaetosyllis) 
  : 
  Two 
  male 
  stolons, 
  34-37 
  segments 
  

   (one 
  unmodified 
  anterior 
  segment, 
  31-33 
  modified 
  segments 
  with 
  

   swimming 
  setae, 
  2 
  or 
  3 
  small, 
  unmodified 
  posterior 
  segments); 
  long 
  

   swimming 
  notosetae 
  subequal 
  to 
  dorsal 
  cirri; 
  dorsal 
  cirri 
  of 
  first 
  

   unmodified 
  segment 
  broken 
  off 
  at 
  cirrophores; 
  darkly 
  pigmented 
  

   reddish 
  brown 
  dorsaUy 
  and 
  ventrally. 
  

  

  New 
  Records. 
  — 
  Arctic 
  Alaska: 
  Stem 
  form: 
  Off 
  Point 
  Barrow 
  base, 
  

   18.3-123.5 
  fms., 
  up 
  to 
  15 
  miles 
  from 
  shore, 
  on 
  bottoms 
  of 
  mud, 
  stones, 
  

   worm 
  tubes, 
  from 
  breaking 
  rocks 
  and 
  bryozoans, 
  from 
  interstices 
  

   between 
  pebbles 
  and 
  gravel 
  covering 
  tunicate, 
  Molgula 
  sp., 
  from 
  

   various 
  combinations 
  of 
  mud, 
  pebbles, 
  stones, 
  gravel, 
  rocks, 
  large 
  

   perforated 
  rocks, 
  worm 
  tubes, 
  and 
  shells 
  (21 
  stations, 
  206 
  specimens). 
  

   Male 
  stolons: 
  Off 
  Point 
  Barrow 
  base, 
  1.6 
  miles 
  from 
  shore, 
  vertical 
  

   plankton 
  haul 
  of 
  13 
  fms. 
  through 
  hole 
  in 
  ice 
  (March 
  29, 
  1950, 
  2 
  speci- 
  

   mens). 
  West 
  Coast 
  North 
  America: 
  Washington 
  Sound, 
  17-21 
  

   fms., 
  Pettibone. 
  Canadian 
  Arctic: 
  Center 
  Foxe 
  Basin, 
  25-31 
  fms., 
  

   Bartlett, 
  1927. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Ai'ctic: 
  Siberian, 
  Alaskan, 
  

   and 
  Canadian 
  Ai-ctic, 
  Baffin 
  Bay, 
  Greenland, 
  Jan 
  Mayen, 
  Spitsbergen, 
  

   Franz 
  Josef 
  Land, 
  Novaya 
  Zemlya, 
  Kara 
  Sea. 
  Also 
  Iceland, 
  Faroes; 
  

   Bering 
  Sea 
  to 
  southern 
  California; 
  north 
  Japan 
  Sea, 
  China. 
  In 
  low 
  

   water 
  to 
  378 
  fathoms; 
  sexual 
  stolons 
  in 
  plankton. 
  

  

  Genus 
  Sphaerosyllis 
  Claparfede, 
  1863 
  

  

  Represented 
  by 
  a 
  single 
  species 
  from 
  Point 
  Barrow. 
  

  

  Sphaerosyllis 
  erinaceus 
  Clapar^de, 
  1863 
  

  

  Figure 
  28, 
  m 
  

  

  Sphaerosyllis 
  erinaceus 
  Claparfede, 
  1863, 
  p. 
  45, 
  pi. 
  13, 
  fig. 
  38 
  (fide 
  Fauvel). 
  — 
  

   Southern, 
  1914, 
  p. 
  20. 
  — 
  Fauvel, 
  1923, 
  p. 
  302, 
  fig. 
  115, 
  q-r. 
  — 
  Annenkova, 
  

   1934, 
  p. 
  322; 
  1938, 
  p. 
  153.— 
  ? 
  Rioja, 
  1943, 
  p. 
  211, 
  figs. 
  1-6.— 
  Gorbunov, 
  1946, 
  

   p. 
  38.— 
  Zatsepin, 
  1948, 
  p. 
  116, 
  pi. 
  31, 
  fig. 
  7. 
  

  

  