﻿340 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  i03 
  

  

  depression 
  extending 
  over 
  10-12 
  most 
  posterior 
  segments, 
  bordered 
  

   by 
  high 
  sinuous 
  membrane. 
  Pygidium 
  with 
  terminal 
  anus, 
  with 
  

   conical 
  bulbous 
  dorsal 
  valve. 
  Colorless 
  or 
  tannish 
  in 
  alcohol. 
  Tube 
  

   membranous, 
  encrusted 
  with 
  sand 
  grains 
  and 
  certain 
  amount 
  of 
  

   debris. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  12.1 
  

   miles 
  from 
  shore, 
  36-123.5 
  fms., 
  on 
  bottoms 
  of 
  mass 
  of 
  worm 
  tubes 
  

   and 
  stones, 
  rocks, 
  large 
  perforated 
  rocks 
  (3 
  stations, 
  3 
  specimens). 
  

   East 
  Coast 
  North 
  America: 
  Off 
  Labrador, 
  30 
  fms., 
  mud 
  with 
  

   rock, 
  Blue 
  Dolphin 
  Expedition, 
  1950. 
  

  

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

   and 
  Canadian 
  Arctic, 
  Davis 
  Strait, 
  Greenland, 
  Jan 
  Mayen, 
  Spits- 
  

   bergen, 
  Novaya 
  Zemlya, 
  Kara 
  Sea. 
  Also 
  Iceland, 
  Norway 
  to 
  

   Danish 
  waters; 
  Hudson 
  Bay 
  to 
  Labrador; 
  Bering 
  Sea 
  to 
  British 
  

   Columbia; 
  north 
  Japan 
  Sea. 
  In 
  2-389 
  fathoms. 
  

  

  Genus 
  Myxicola 
  (Koch 
  in 
  MS.) 
  Renier, 
  1848 
  

   Myxicola 
  infundibulum 
  (Montagu, 
  1808) 
  

  

  Figure 
  39, 
  o-q 
  

  

  Amphitrite 
  infundibulum 
  Montagu, 
  1808, 
  p. 
  109, 
  pi. 
  8. 
  

  

  Myxicola 
  steenstrupii 
  Kroyer, 
  1856, 
  p. 
  35. 
  — 
  Malmgren, 
  1865, 
  p. 
  408, 
  pi. 
  29, 
  fig. 
  

  

  90.— 
  Th^el, 
  1879, 
  p. 
  66.— 
  Webster 
  and 
  Benedict, 
  1884, 
  p. 
  737; 
  1887, 
  p. 
  

  

  750.— 
  Moore, 
  1909b, 
  p. 
  144.— 
  Eliason, 
  1920, 
  p. 
  79.— 
  Zatsepin, 
  1948, 
  p. 
  164, 
  

  

  pi. 
  39, 
  fig. 
  16. 
  

   Myxicola 
  infundibulum 
  Fauvel, 
  1927, 
  p. 
  342, 
  fig. 
  119, 
  a-i; 
  1934a, 
  p. 
  74; 
  1936, 
  

  

  p. 
  86.— 
  Annenkova, 
  1934, 
  p. 
  322.— 
  Okuda, 
  1939, 
  p. 
  243.— 
  Hartman, 
  1944a, 
  

  

  pp. 
  335, 
  343, 
  pi. 
  21, 
  fig. 
  1; 
  1948, 
  p. 
  47.— 
  Wesenberg-Lund, 
  1950b, 
  p. 
  

  

  134; 
  1951, 
  p. 
  125.— 
  Berkeley 
  and 
  Berkeley, 
  1952, 
  p. 
  119, 
  fig. 
  244. 
  

  

  Description. 
  — 
  Length 
  23 
  mm., 
  width 
  5 
  mm. 
  (up 
  to 
  200 
  mm. 
  long, 
  

   15 
  mm. 
  wide 
  — 
  Fauvel, 
  1927). 
  Collarette 
  represented 
  by 
  a 
  triangular 
  

   ventral 
  lobe 
  extending 
  anteriorly 
  between 
  the 
  branchial 
  lobes, 
  absent 
  

   laterally 
  and 
  dorsally. 
  A 
  middorsal 
  groove 
  on 
  first 
  8-10 
  segments. 
  

   Branchial 
  filaments 
  20-40, 
  united 
  for 
  greater 
  part 
  of 
  their 
  length 
  by 
  

  

  Figure 
  39. 
  — 
  Sabellidae: 
  a, 
  Chone 
  infundibulif 
  omits, 
  ventral 
  view 
  collarette; 
  b, 
  same, 
  lateral 
  

   view; 
  c, 
  same, 
  dorsal 
  view; 
  d, 
  same, 
  dorsal 
  view 
  pygidium; 
  e, 
  same, 
  tip 
  of 
  foliaceous 
  bran- 
  

   chial 
  filament;/, 
  same, 
  thoracic 
  dorsal 
  limbate 
  capillary 
  seta; 
  g, 
  same, 
  thoracic 
  dorsal 
  spatu- 
  

   late 
  seta; 
  k, 
  same, 
  thoracic 
  dorsal 
  bayonette 
  seta; 
  i, 
  same, 
  thoracic 
  crotchet 
  from 
  ventral 
  

   torus; 
  y, 
  same, 
  abdominal 
  uncinus; 
  k, 
  Chone 
  duneri, 
  lateral 
  view 
  collarette; 
  /, 
  same, 
  tip 
  

   of 
  branchial 
  filament; 
  m, 
  Euchone 
  analis, 
  lateral 
  view 
  anterior 
  end; 
  n, 
  same, 
  ventral 
  view 
  

   posterior 
  end; 
  o, 
  Myxicola 
  infundibulum, 
  lateral 
  view 
  anterior 
  end; 
  p, 
  same, 
  lateral 
  view 
  

   segment 
  from 
  abdominal 
  region; 
  ^, 
  same, 
  dorsal 
  view 
  pygidium. 
  Serpulidae: 
  r, 
  Sptrorbis 
  

   granulatus, 
  dorsal 
  view 
  tube; 
  s, 
  same, 
  operculum 
  (after 
  Fauvel); 
  /, 
  same, 
  collar 
  seta 
  (seta 
  

   of 
  first 
  setiger); 
  u, 
  Spirorbis 
  spirillum, 
  dorsal 
  view 
  anterior 
  end 
  extended 
  from 
  tube 
  (var. 
  

   ascendens, 
  after 
  Emerton); 
  f, 
  same, 
  discoidal 
  form 
  of 
  tube; 
  w, 
  same, 
  operculum; 
  at, 
  same, 
  

   collar 
  seta 
  (seta 
  of 
  first 
  setiger, 
  after 
  Fauvel). 
  (For 
  explanation 
  of 
  symbols, 
  see 
  p. 
  210.) 
  

  

  