﻿344 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  and 
  various 
  combinations 
  of 
  mud, 
  gravel, 
  rocks, 
  stones 
  (3 
  stations, 
  7 
  

   specimens). 
  Southwestern 
  Alaska: 
  Kiska 
  Harbor, 
  Aleutians, 
  10 
  

   fms., 
  Dall, 
  1873; 
  Canoe 
  Bay, 
  25 
  fms., 
  on 
  old 
  clam 
  shell, 
  Alaska 
  King 
  

   Crab 
  Investigation, 
  1940. 
  East 
  Coast 
  North 
  America: 
  Off 
  Lab- 
  

   rador, 
  30-35 
  fms., 
  mud, 
  rocks. 
  Blue 
  Dolphin 
  Expedition, 
  1950; 
  off 
  

   Nova 
  Scotia, 
  Maine, 
  Massachusetts, 
  North 
  Carolina 
  (Cape 
  Hatteras), 
  

   17-34 
  fms., 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Arctic: 
  Siberian 
  and 
  

   Alaskan 
  Arctic, 
  Greenland, 
  Jan 
  Mayen, 
  Spitsbergen, 
  Franz 
  Josef 
  

   Land, 
  Novaya 
  Zemlya, 
  Kara 
  Sea. 
  Also 
  Iceland, 
  Faroes, 
  Norway 
  to 
  

   France; 
  Hudson 
  Bay 
  to 
  North 
  Carolina; 
  Alaska 
  to 
  British 
  Columbia; 
  

   north 
  Japan 
  Sea. 
  In 
  low 
  water 
  to 
  239 
  fathoms. 
  

  

  Spirorbis 
  (Dexiospird) 
  spirillum 
  (Linne, 
  1758) 
  

  

  Figure 
  39, 
  u-x 
  

  

  Serpula 
  spirillum 
  Linn6, 
  1758, 
  p. 
  785. 
  

  

  Spirorbis 
  (Dexiospira) 
  spirillum 
  Borg, 
  1917, 
  p. 
  20, 
  figs. 
  3, 
  4. 
  — 
  Fauvel, 
  1927, 
  p. 
  

  

  392, 
  fig. 
  132, 
  f-p.— 
  Augener, 
  1928, 
  p. 
  814.— 
  Annenkova, 
  1934, 
  p. 
  322; 
  1937, 
  

  

  p. 
  197; 
  1938, 
  p. 
  218.— 
  Treadwell, 
  1937, 
  p. 
  35.— 
  Hartman, 
  1942a, 
  p. 
  91; 
  

  

  1944a, 
  pp. 
  336, 
  343, 
  pi. 
  22, 
  fig. 
  2.— 
  Berkeley 
  and 
  Berkeley, 
  1943, 
  p. 
  130; 
  

  

  1952, 
  p. 
  133, 
  figs. 
  272-274.— 
  Thorson, 
  1946, 
  p. 
  138.— 
  Gorbunov, 
  1946, 
  p. 
  

  

  39.— 
  Zatsepin, 
  1948, 
  p. 
  166.— 
  Wesenberg-Lund, 
  1950a, 
  p. 
  62; 
  1950b, 
  p. 
  138; 
  

  

  1951, 
  p. 
  132. 
  

   Circeis 
  spirillum 
  Chamberlin, 
  1920, 
  p. 
  28. 
  

   Dexiospira 
  spirillum 
  Hartraan, 
  1944b, 
  p. 
  287; 
  1948, 
  p. 
  51; 
  1951, 
  p. 
  121. 
  — 
  Hartman 
  

  

  and 
  Reish, 
  1950, 
  p. 
  47. 
  

  

  Description. 
  — 
  Tube 
  1-3 
  mm. 
  in 
  diameter, 
  white, 
  opaque 
  (may 
  be 
  

   somewhat 
  translucent) 
  , 
  shiny, 
  smooth, 
  porcellaneous, 
  coded 
  dextrally, 
  

   up 
  to 
  3K 
  coils; 
  tube 
  may 
  be 
  coiled 
  flatly 
  (discoidal 
  form) 
  when 
  

   attached 
  to 
  smooth 
  surfaces, 
  or 
  partly 
  unrolled, 
  the 
  last 
  coU 
  or 
  part 
  

   of 
  last 
  coil 
  raised 
  from 
  substratum 
  (var. 
  ascendens 
  Levinsen, 
  var. 
  

   lucidus 
  Morch) 
  when 
  attached 
  to 
  rough 
  surfaces, 
  as 
  branching 
  

   bryozoan 
  colonies. 
  Operculum 
  with 
  shallow, 
  calcareous, 
  concave, 
  

   terminal 
  plate, 
  with 
  slight 
  projection 
  (talon) 
  on 
  under 
  side. 
  Collar 
  

   setae 
  with 
  serrate 
  blades, 
  without 
  basal 
  crenulate 
  wings. 
  Embryos 
  

   incubated 
  in 
  tube 
  (eggs 
  in 
  tube, 
  Point 
  Barrow, 
  September 
  9, 
  1948, 
  

   and 
  August 
  30, 
  1949). 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  8 
  

   miles 
  from 
  shore, 
  21-75.5 
  fms., 
  on 
  bottoms 
  of 
  stones 
  and 
  various 
  

   combinations 
  of 
  gravel, 
  rocks, 
  on 
  bryozoa, 
  on 
  Hyas 
  coarctatus, 
  on 
  

   spines 
  of 
  Boltenia 
  echinata 
  (8 
  stations, 
  39 
  specimens). 
  Gulf 
  of 
  

   Alaska: 
  Albatross 
  Sta., 
  Observation 
  Island, 
  Cordova, 
  1914. 
  West 
  

   Greenland: 
  Godhavn, 
  Greely 
  Relief 
  Expedition, 
  1884. 
  East 
  Coast 
  

   North 
  America: 
  Off 
  Labrador, 
  10-40 
  fms.. 
  Blue 
  Dolphin 
  Expeditions, 
  

   1949, 
  1950, 
  1951; 
  off 
  Nova 
  Scotia, 
  Maine, 
  Massachusetts, 
  Long 
  

   Island 
  Sound, 
  16-83 
  fms., 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  