﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  239 
  

  

  with 
  slender 
  filamentous 
  tips, 
  the 
  latter 
  about 
  as 
  long 
  as 
  the 
  enlarged 
  

   basal 
  part 
  except 
  for 
  the 
  ventral 
  tentacular 
  cirri 
  on 
  the 
  second 
  segment 
  

   which 
  are 
  much 
  shorter. 
  Dorsal 
  cirri 
  oval 
  or 
  bluntly 
  conical. 
  

   Ventral 
  cirri 
  elongate 
  oval. 
  Anal 
  cirri 
  short, 
  oval, 
  1.5 
  to 
  2 
  times 
  

   longer 
  than 
  wide. 
  Color: 
  In 
  alcohol: 
  Greenish 
  tan 
  to 
  brown. 
  In 
  

   life: 
  Flesh 
  ventrally, 
  green 
  and 
  flesh 
  dorsally, 
  with 
  salmon-colored 
  

   eggs 
  showing 
  through. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  16.7-75.5 
  

   fms., 
  up 
  to 
  8 
  miles 
  from 
  shore, 
  on 
  various 
  combinations 
  of 
  gravel, 
  

   small 
  stones, 
  rocks, 
  bryozoans, 
  hydroids, 
  Saxicava 
  shells 
  (6 
  stations, 
  

   46 
  specimens). 
  

  

  Distribution. 
  — 
  Few 
  scattered 
  records 
  in 
  the 
  Arctic: 
  Siberian 
  and 
  

   Alaskan 
  Arctic, 
  Davis 
  Strait. 
  In 
  16.7-75.5 
  fathoms. 
  

  

  Family 
  Hesionidae 
  

  

  Prostomium 
  usually 
  with 
  four 
  eyes, 
  two 
  or 
  three 
  antennae, 
  two 
  

   biarticulate 
  palps 
  (fig. 
  28, 
  a). 
  Two 
  to 
  eight 
  pairs 
  tentacular 
  cirri 
  on 
  

   one 
  to 
  four 
  more 
  or 
  less 
  distinct 
  achaetous 
  tentacular 
  segments. 
  

   Parapodia 
  biramous 
  or 
  subbiramous; 
  notopodia 
  may 
  be 
  greatly 
  re- 
  

   duced, 
  with 
  notosetae 
  simple 
  or 
  lacking; 
  neurosetae 
  compound 
  (fig. 
  

   28, 
  b). 
  Dorsal 
  cirri 
  long, 
  more 
  or 
  less 
  distinctly 
  articulated; 
  ventral 
  

   cirri 
  shorter; 
  two 
  long 
  anal 
  cirri. 
  Proboscis 
  cylindrical, 
  eversible, 
  

   with 
  marginal 
  papiUae, 
  with 
  or 
  without 
  horny 
  jaws. 
  

  

  Represented 
  by 
  a 
  single 
  species 
  from 
  Point 
  Barrow. 
  (The 
  speci- 
  

   mens 
  from 
  Point 
  Barrow, 
  referred 
  to 
  Castalia 
  multipapillata 
  Theel 
  by 
  

   Murdoch 
  (1885), 
  do 
  not 
  agree 
  with 
  this 
  species 
  nor 
  with 
  any 
  other 
  

   species 
  of 
  hesionid; 
  the 
  parapodia 
  are 
  biramous, 
  both 
  lobes 
  being 
  

   pointed, 
  the 
  notopodia 
  are 
  well 
  developed, 
  with 
  capillary 
  setae; 
  

   neurosetae 
  compound, 
  with 
  delicate 
  tips; 
  the 
  proboscis 
  has 
  numerous 
  

   small 
  papillae; 
  tentacular 
  cirri 
  four 
  pairs; 
  prostomium 
  with 
  two 
  

   pairs 
  eyes, 
  pair 
  biarticulate 
  palps, 
  antennae 
  ? 
  (missing 
  or 
  absent); 
  

   the 
  specimens 
  are 
  very 
  small 
  and 
  in 
  poor 
  condition.) 
  

  

  Genus 
  Castalia 
  Savigny, 
  1820; 
  emend. 
  Fauvel, 
  1923 
  

   Castalia 
  aphroditoides 
  (Fabricius, 
  1780) 
  

  

  Figure 
  28, 
  a, 
  h 
  

  

  Nereis 
  aphroditoides 
  Fabricius, 
  1780, 
  p. 
  296. 
  

  

  Castalia 
  ardica 
  Malmgren, 
  1867, 
  p. 
  32. 
  — 
  Annenkova, 
  1931, 
  p. 
  203. 
  

  

  Castalia 
  fabricii 
  Malmgren, 
  1867, 
  p. 
  32.— 
  Th6el, 
  1879, 
  p. 
  37, 
  pi. 
  3, 
  figs. 
  36, 
  37.— 
  

  

  Berkeley 
  and 
  Berkeley, 
  1943, 
  p. 
  130. 
  

   Castalia 
  aphroditoides 
  Wir6n, 
  1883, 
  p. 
  401.— 
  Augener, 
  1913, 
  p. 
  260; 
  1928, 
  p. 
  715.— 
  

  

  Zatsepin, 
  1948, 
  p. 
  114.— 
  Wesenberg-Lund, 
  1950a, 
  p. 
  13, 
  pi. 
  3, 
  fig. 
  14; 
  19o0b, 
  

  

  p. 
  44. 
  

   Psammate 
  aphroditoides 
  Chamberlin, 
  1920, 
  p. 
  13. 
  

  

  