﻿240 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  Description. 
  — 
  Length 
  2.5-18 
  mm., 
  width 
  without 
  setae 
  0.7-2.5 
  mm. 
  

   Segments 
  25-43. 
  Body 
  cylindrical. 
  Prostomium 
  rectangular, 
  wider 
  

   than 
  long, 
  widest 
  anteriorly, 
  notched 
  posteriorly, 
  with 
  two 
  pairs 
  

   eyes 
  in 
  trapezoidal 
  arrangement, 
  anterior 
  pair 
  larger; 
  palps 
  on 
  an- 
  

   terolateral 
  borders 
  of 
  prostomium; 
  two 
  filiform 
  antennae 
  medial 
  to 
  

   palps 
  (without 
  unpaired 
  antenna); 
  antennae 
  subequal, 
  about 
  same 
  

   length 
  as 
  prostomium. 
  SLx 
  pairs 
  tentacular 
  cirri 
  on 
  three 
  more 
  or 
  less 
  

   distinct 
  achaetous 
  segments; 
  tentacular 
  cirri 
  long, 
  filiform, 
  articulated, 
  

   with 
  prominent 
  cirrophores. 
  Without 
  distinct 
  notopodia 
  (acicula 
  in 
  

   cirrophores 
  of 
  dorsal 
  cirri 
  only); 
  without 
  notosetae. 
  Neuropodia 
  

   well 
  developed, 
  with 
  three 
  diverging 
  conical 
  distal 
  lobes 
  : 
  Lip 
  anterior 
  

   to 
  setae 
  with 
  median 
  and 
  dorsal 
  conical 
  lobes; 
  lip 
  posterior 
  to 
  setae 
  

   with 
  rounded 
  median 
  and 
  conical 
  ventral 
  lobes; 
  neurosetae 
  compound. 
  

   Dorsal 
  and 
  anal 
  cirri 
  long, 
  articulated. 
  Proboscis 
  barrel-shaped 
  with 
  

   10 
  soft 
  papillae 
  around 
  opening 
  (four 
  dorsal 
  to 
  lateral 
  grooves, 
  three 
  

   each 
  on 
  two 
  ventrolateral 
  folds), 
  with 
  a 
  median 
  ventral 
  notch, 
  with 
  

   two 
  thickened 
  ventrolateral 
  ridges 
  (the 
  so-called 
  jaws) 
  lateral 
  to 
  the 
  

   ventral 
  notch. 
  Color: 
  In 
  alcohol: 
  Without 
  color, 
  or 
  slightly 
  greenish 
  

   dorsally 
  (especially 
  in 
  anterior 
  part), 
  or 
  brownish. 
  In 
  life: 
  Orange- 
  

   flesh, 
  with 
  greenish 
  eggs 
  inside, 
  with 
  red 
  eyes. 
  

  

  Remarks. 
  — 
  Two 
  young 
  specimens 
  found 
  in 
  plankton 
  tow 
  beneath 
  

   ice 
  February 
  28, 
  1950. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Eluitkak 
  Pass, 
  Elson 
  Lagoon 
  near 
  

   Point 
  Barrow, 
  6.6 
  fms., 
  stony-mud; 
  off 
  Point 
  Barrow 
  base, 
  21-75.5 
  

   fms., 
  up 
  to 
  8 
  miles 
  from 
  shore, 
  on 
  bottoms 
  of 
  mud, 
  stones, 
  and 
  various 
  

   combinations 
  of 
  mud, 
  stones, 
  gravel, 
  rocks, 
  and 
  from 
  breaking 
  apart 
  

   fohaceous 
  brj^ozoans 
  (10 
  stations, 
  28 
  specimens). 
  Northwest 
  

   Greenland: 
  Walrus 
  grounds, 
  Murchison 
  Sound, 
  Bartlett, 
  1938. 
  

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

   Expedition, 
  1949. 
  

  

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

   and 
  Canadian 
  Arctic, 
  Greenland, 
  Spitsbergen, 
  Franz 
  Josef 
  Land, 
  

   Novaya 
  Zemlya, 
  Kara 
  Sea. 
  Also 
  Bering 
  Sea; 
  Denmark; 
  Hudson 
  Bay, 
  

   Labrador. 
  In 
  2-75.5 
  fathoms. 
  

  

  Family 
  Syllidae 
  

  

  Body 
  of 
  small 
  size. 
  Prostomium 
  with 
  four 
  eyes 
  (sometimes 
  six), 
  

   two 
  palps 
  (may 
  be 
  reduced 
  and 
  fused), 
  three 
  antennae 
  (figs. 
  28, 
  29). 
  

   Tentacular 
  segment 
  achaetous, 
  with 
  one 
  or 
  two 
  pairs 
  tentacular 
  cirri. 
  

   Parapodia 
  uniramous, 
  with 
  dorsal 
  and 
  ventral 
  cirri 
  (latter 
  may 
  be 
  

   absent). 
  Two 
  anal 
  cirri. 
  Setae 
  mostly 
  compound, 
  sometimes 
  with 
  

   additional 
  simple 
  setae. 
  Proboscis 
  eversible, 
  armed 
  or 
  not 
  with 
  one 
  

  

  