﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  329 
  

  

  binations 
  of 
  mud, 
  pebbles, 
  gravel, 
  stones, 
  rocks, 
  large 
  perforated 
  

   rocks, 
  with 
  bryozoans, 
  worm 
  tubes 
  (13 
  stations, 
  35 
  specimens). 
  

   Spitsbergen: 
  Spitsbergen 
  Sea, 
  U. 
  S. 
  S. 
  Alliance, 
  1881. 
  Northwest 
  

   Greenland: 
  One 
  mile 
  northwest 
  Conical 
  Rock, 
  25-60 
  fms., 
  Bartlett, 
  

   1940. 
  Bering 
  Sea: 
  St. 
  Paul 
  Island, 
  Pribilofs, 
  Palmer, 
  1890. 
  East 
  

   Coast 
  North 
  America: 
  Off 
  Labrador, 
  45 
  fms., 
  silt, 
  Blue 
  Dolphin 
  

   Expedition, 
  1949. 
  West 
  Coast 
  North 
  America: 
  Pavlof 
  Bay, 
  

   Alaska, 
  150 
  fms., 
  Alaska 
  King 
  Crab 
  Investigation, 
  1940; 
  Washington 
  

   Sound, 
  12-46 
  fms., 
  mud 
  and 
  mussels, 
  Pettibone. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Arctic: 
  Siberian 
  and 
  

   Alaskan 
  Arctic, 
  Greenland, 
  Spitsbergen, 
  White 
  Sea, 
  Novaya 
  Zemlya, 
  

   Kara 
  Sea. 
  Also 
  Iceland, 
  Faroes, 
  Swedish 
  west 
  coast 
  to 
  France, 
  

   Mediterranean; 
  Labrador 
  to 
  Maine; 
  Bering 
  Sea 
  to 
  Washington; 
  

   Okhotsk 
  Sea 
  to 
  north 
  Japan 
  Sea. 
  In 
  low 
  water 
  to 
  889 
  fathoms. 
  

  

  Genus 
  Trichohranchus 
  Malmgren, 
  1865 
  

   Trtchobranchus 
  glacialis 
  Malmgren, 
  1865 
  

  

  Figure 
  37, 
  g-i 
  

  

  Trichohranchus 
  glacialis 
  Malmgren, 
  1865, 
  p. 
  395, 
  pi. 
  24, 
  fig. 
  65. 
  — 
  Webster 
  and 
  

   Benedict, 
  1887, 
  p. 
  750.— 
  Ehlers, 
  1913, 
  p. 
  566.— 
  Hessle, 
  1917, 
  p. 
  131.— 
  

   Fauvel, 
  1927, 
  p. 
  288, 
  fig.lOO,a-h.— 
  Augener, 
  1928, 
  p. 
  792.— 
  Annenkova, 
  

   1937, 
  p. 
  190; 
  1938, 
  p. 
  202.— 
  Zatsepin, 
  1948, 
  p. 
  153, 
  pi. 
  38, 
  fig. 
  1.— 
  Wesenberg- 
  

   Lund, 
  1950a, 
  p. 
  55; 
  1950b, 
  p. 
  125; 
  1951, 
  p. 
  115.— 
  Berkeley 
  and 
  Berkeley, 
  

   1952, 
  p. 
  76, 
  figs. 
  154, 
  155. 
  

  

  Trichohranchus 
  glacialis 
  var. 
  antarcticus 
  Hessle, 
  1917, 
  p. 
  132. 
  — 
  Hartman, 
  1952, 
  

   p. 
  233. 
  

  

  Description. 
  — 
  Length 
  up 
  to 
  30 
  mm., 
  width 
  3 
  mm., 
  segments 
  60-70. 
  

   Buccal 
  segment 
  and 
  prostomium 
  form 
  thick, 
  tesselated, 
  inflated 
  lower 
  

   lip 
  connected 
  laterally 
  with 
  pair 
  of 
  projecting, 
  rounded, 
  flattened 
  lobes 
  

   (ventral 
  to 
  mass 
  of 
  tentacles), 
  cephalic 
  ridge 
  with 
  numerous 
  black 
  

   eyespots 
  (absent 
  in 
  var. 
  antarcticus) 
  , 
  undulating 
  tentacular 
  membrane 
  

   with 
  very 
  numerous 
  tentacles, 
  and 
  folded 
  upper 
  lip; 
  some 
  tentacles 
  

   larger, 
  distinctly 
  grooved; 
  others 
  smaller, 
  filiform. 
  Three 
  pairs 
  

   branchiae 
  on 
  segments 
  2-4, 
  each 
  composed 
  of 
  single 
  long 
  filament. 
  

   With 
  slightly 
  projecting 
  lateral 
  lobes 
  on 
  branchial 
  segments. 
  Thoracic 
  

   setigers 
  and 
  uncinigers 
  15, 
  beginning 
  on 
  segment 
  6; 
  notosetae 
  limbate, 
  

   with 
  smooth 
  capillary 
  tips; 
  neuropodial 
  uncini 
  aciculiform 
  (crotchets). 
  

   Abdominal 
  segments 
  with 
  avicular 
  uncini 
  in 
  single 
  rows 
  on 
  triangular 
  

   projecting 
  pinnules. 
  Pygidium 
  with 
  anal 
  opening 
  crenulate. 
  Color- 
  

   less 
  in 
  alcohol. 
  Tube 
  membranous, 
  encrusted 
  with 
  mud 
  or 
  fine 
  sand. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  5 
  

   miles 
  from 
  shore, 
  27-49 
  fms., 
  on 
  various 
  combinations 
  of 
  mud, 
  gravel, 
  

   stones, 
  rocks, 
  shells 
  (5 
  stations, 
  15 
  specimens). 
  East 
  Coast 
  North 
  

   America: 
  Cape 
  Cod 
  Bay, 
  Massachusetts, 
  27-118 
  fms., 
  U. 
  S. 
  Fish 
  

   Commission. 
  

  

  