﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  ^PETTIBONE 
  327 
  

  

  BJQeeland 
  Bay, 
  Frobisher 
  Bay, 
  Baffin 
  Island, 
  14 
  fms., 
  Bartlett, 
  1942. 
  

   Distribution. 
  — 
  Scattered 
  records 
  in 
  the 
  Arctic: 
  Siberian, 
  Alaskan, 
  

   and 
  Canadian 
  Arctic. 
  Also 
  Swedish 
  west 
  coast, 
  Danish 
  waters; 
  

   Labrador; 
  southwestern 
  Alaska; 
  north 
  Japan 
  Sea. 
  In 
  7-140.5 
  

   fathoms. 
  

  

  G^nus 
  Thelepus 
  Leuckart, 
  1849 
  

  

  Thelepua 
  cincinnatus 
  (Fabricius, 
  1780) 
  

  

  Figure 
  37, 
  d 
  

  

  Amphitrite 
  cindnnata 
  Fabricius, 
  1780, 
  p. 
  286. 
  

  

  Thelepus 
  circinnaia 
  Malmgren, 
  1865, 
  p. 
  387, 
  pi. 
  22, 
  fig. 
  58. 
  

  

  Thelepus 
  cincinnatus 
  Webster 
  and 
  Benedict, 
  1887, 
  p. 
  749. 
  — 
  Hessle, 
  1917, 
  p. 
  212. 
  — 
  

   Chamberlin, 
  1920, 
  p. 
  23.— 
  Eliason, 
  1920, 
  p. 
  76.— 
  Fauvel, 
  1927, 
  p. 
  271, 
  fig. 
  

   95, 
  i-ra; 
  1932, 
  p. 
  233, 
  fig. 
  40; 
  1934a, 
  p. 
  69.— 
  Augener, 
  1928, 
  p. 
  790.— 
  Monro, 
  

   1930, 
  p. 
  192; 
  1936, 
  p. 
  182.— 
  Treadwell, 
  1937, 
  p. 
  33.— 
  Friedrich, 
  1939, 
  p. 
  127.— 
  

   Hartman, 
  1944a, 
  pp. 
  336, 
  343; 
  1952, 
  p. 
  236.— 
  Gorbunov, 
  1946, 
  p. 
  39.— 
  

   Zatsepin, 
  1948, 
  p. 
  154, 
  pi. 
  38, 
  fig. 
  7.— 
  Wesenberg-Lund, 
  1950a, 
  p. 
  54; 
  

   1950b, 
  p. 
  122; 
  1951, 
  p. 
  112. 
  

  

  Thelepus 
  hamatus 
  Moore, 
  1905b, 
  p. 
  856, 
  pi. 
  44, 
  figs. 
  16-18. 
  — 
  Hartman, 
  1948, 
  

   p. 
  44. 
  — 
  Berkeley 
  and 
  Berkeley, 
  1952, 
  p. 
  82, 
  fig. 
  167. 
  

  

  Description. 
  — 
  Up 
  to 
  200 
  mm. 
  long, 
  10 
  mm. 
  wide, 
  segments 
  nu- 
  

   merous. 
  Dorsal 
  surface 
  rugose, 
  with 
  small 
  glandular 
  warts 
  irregularly 
  

   distributed 
  and 
  especially 
  abundant 
  anteriorly. 
  Ventral 
  shields 
  in- 
  

   distinct, 
  wide, 
  somewhat 
  wrinkled. 
  Buccal 
  segment 
  and 
  prostomium 
  

   forming 
  a 
  thick 
  lower 
  lip, 
  a 
  prominent 
  horseshoe-shaped 
  upper 
  Hp, 
  

   a 
  semicircular 
  cephalic 
  ridge 
  with 
  numerous 
  small 
  eye-spots; 
  tentacular 
  

   area 
  between 
  upper 
  lip 
  and 
  cephalic 
  ridge 
  with 
  numerous, 
  rather 
  

   thick 
  tentacles. 
  Branchiae 
  2 
  pairs 
  on 
  segments 
  2 
  and 
  3, 
  each 
  formed 
  

   of 
  numerous, 
  simple 
  filaments 
  arranged 
  in 
  parallel 
  transverse 
  rows. 
  

   Nephridial 
  papiUae 
  on 
  segments 
  4-7. 
  Notosetae 
  begin 
  on 
  segment 
  3, 
  

   continuing 
  on 
  about 
  40 
  segments 
  (or 
  almost 
  to 
  posterior 
  end). 
  Un- 
  

   cini 
  begin 
  on 
  segment 
  5 
  (setiger 
  3), 
  in 
  single 
  rows 
  throughout, 
  the 
  

   uncinigerous 
  tori 
  gradually 
  transformed 
  into 
  projecting 
  rectangular 
  

   pinnules. 
  Pygidium 
  with 
  crenulate 
  anal 
  opening. 
  Color: 
  In 
  life: 
  

   Orange 
  with 
  red 
  branchiae, 
  tan 
  tentacles, 
  with 
  whitish 
  glandular 
  

   areas 
  ventrally 
  and 
  laterally. 
  In 
  alcohol: 
  Colorless. 
  Tube: 
  Cylin- 
  

   drical, 
  twisted, 
  with 
  tough, 
  transparent, 
  membranous 
  lining, 
  covered 
  

   with 
  small 
  pebbles 
  of 
  varying 
  sizes, 
  with 
  fragments 
  of 
  shells, 
  bryo- 
  

   zoans, 
  foraminiferans, 
  old 
  worm 
  tubes, 
  algae. 
  

  

  Remarks. 
  — 
  The 
  tj^pe 
  of 
  T. 
  hamatus 
  Moore 
  from 
  Alaska 
  was 
  ex- 
  

   amined 
  and 
  is 
  herein 
  referred 
  to 
  T. 
  cincinnatus; 
  it 
  is 
  a 
  small 
  specimen, 
  

   consisting 
  of 
  anterior 
  end 
  only. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  15 
  

   miles 
  from 
  shore, 
  20-123.5 
  fms,, 
  on 
  bottoms 
  of 
  mass 
  of 
  worm 
  tubes, 
  

   rocks, 
  stones, 
  gravel, 
  attached 
  to 
  stems 
  of 
  Tuhularia 
  (6 
  stations, 
  7 
  

   specimens). 
  West 
  Greenland: 
  Godhavn, 
  off 
  Hare 
  Island, 
  70°20' 
  

  

  