﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  309 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  7 
  

   miles 
  from 
  shore, 
  4.3-70 
  fms., 
  on 
  bottoms 
  of 
  mud, 
  and 
  gravel, 
  stones 
  

   (3 
  stations, 
  6 
  specimens) 
  . 
  Bering 
  Sea 
  : 
  Bering 
  Island, 
  N. 
  Grebiatzky, 
  

   1884. 
  West 
  Coast 
  North 
  America: 
  Albatross 
  Sta. 
  2842, 
  54°15' 
  N., 
  

   166°3' 
  W., 
  72 
  fms.; 
  Washington 
  and 
  Puget 
  Sounds, 
  10-110 
  fms., 
  

   Pettibone. 
  

  

  Distribution. 
  — 
  Arctic 
  Alaska, 
  Bering 
  Sea 
  to 
  Panamd; 
  north 
  Japan 
  

   Sea 
  to 
  Japan; 
  west 
  coast 
  South 
  America 
  (ChUe), 
  Straits 
  of 
  Magellan, 
  

   Falkland 
  Islands. 
  In 
  low 
  water 
  to 
  110 
  fathoms. 
  

  

  Family 
  Sternaspidae 
  

  

  Body 
  very 
  short, 
  grublike, 
  aberrant; 
  segments 
  few, 
  uniramous 
  or 
  

   achaetous, 
  without 
  parapodial 
  lobes 
  (fig. 
  35, 
  a). 
  Prostomium 
  re- 
  

   duced 
  to 
  small 
  rounded 
  tubercle, 
  without 
  appendages. 
  Mouth 
  

   rounded, 
  subterminal, 
  ventral 
  to 
  prostomium. 
  Body 
  divided 
  into 
  

   three 
  regions: 
  (1) 
  anterior, 
  with 
  complete 
  rings, 
  with 
  lateral 
  concentric 
  

   rows 
  of 
  strong 
  acicular 
  yeUow 
  setae 
  on 
  anterior 
  three 
  segments 
  

   (anterior 
  region 
  may 
  be 
  retracted 
  into 
  more 
  posterior 
  segments); 
  

   (2) 
  middle, 
  with 
  segmental 
  divisions 
  absent 
  on 
  midventral 
  part, 
  

   without 
  setae 
  visible 
  externally; 
  (3) 
  posterior, 
  with 
  ventral 
  horny 
  

   shield 
  formed 
  by 
  two 
  trapezoidal 
  plates 
  provided 
  on 
  their 
  external 
  

   sides 
  with 
  radiating 
  bundles 
  of 
  stiff, 
  barbed 
  and 
  smooth 
  capillary 
  

   setae 
  (fig. 
  35, 
  b). 
  Numerous, 
  long, 
  filiform 
  anal 
  branchiae, 
  inserted 
  

   on 
  posterior 
  end. 
  Anus 
  terminal. 
  Lives 
  in 
  mud. 
  

  

  Represented 
  by 
  a 
  single 
  species 
  from 
  Point 
  Barrow 
  (the 
  family 
  is 
  

   usually 
  considered 
  to 
  have 
  a 
  single 
  cosmopolitan 
  species). 
  

  

  Genus 
  Sternaspis 
  Otto, 
  1821 
  

   Stemaspis 
  scutata 
  (Ranzani, 
  1817) 
  

  

  Figure 
  35, 
  a, 
  b 
  

  

  Thalassema 
  scutata 
  Ranzani, 
  1817, 
  p. 
  1457, 
  pi. 
  11, 
  figs. 
  10-13. 
  

  

  Sternaspis 
  fossor 
  Stimpson, 
  1854, 
  p. 
  29, 
  pi. 
  2, 
  fig. 
  19. 
  — 
  Webster 
  and 
  Benedict, 
  

   1884, 
  p. 
  725.— 
  Moore, 
  1909b, 
  p. 
  144; 
  1923, 
  p. 
  218.— 
  Hartman, 
  1944a, 
  pp. 
  336, 
  

   342, 
  pi. 
  33, 
  fig. 
  15.— 
  Berkeley 
  and 
  Berkeley, 
  1952, 
  p. 
  59, 
  fig. 
  123. 
  

  

  Sternaspis 
  islandica 
  Malmgren, 
  1867, 
  p. 
  87, 
  pi. 
  14, 
  fig. 
  85. 
  

  

  Sternaspis 
  scutata 
  Moore, 
  1903, 
  p. 
  487; 
  1908, 
  p. 
  357; 
  1923, 
  p. 
  218.— 
  Fauvel, 
  1927, 
  

   p. 
  216, 
  fig. 
  76, 
  a-g; 
  1932, 
  p. 
  213; 
  1933, 
  p. 
  52; 
  1934a, 
  p. 
  60.— 
  Monro, 
  1930, 
  

   p. 
  178.— 
  Annenkova, 
  1937, 
  p. 
  185; 
  1938, 
  p. 
  196.— 
  Hartman, 
  1942c, 
  p. 
  102.— 
  

   Gorbunov, 
  1946, 
  p. 
  39.— 
  Wesenberg-Lund, 
  1949, 
  p. 
  345; 
  1950a, 
  p. 
  46; 
  1950b, 
  

   p. 
  104; 
  1951, 
  p. 
  98.— 
  Hartman 
  and 
  Reish, 
  1950, 
  p. 
  38. 
  

  

  Sternaspis 
  scutata 
  var. 
  africana 
  Monro, 
  1930, 
  p. 
  179. 
  

  

  