﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  291 
  

  

  Description. 
  — 
  Length 
  28-60 
  mm., 
  width 
  5-9 
  mm., 
  setigers 
  23-35. 
  

   Body 
  fusiform, 
  slightly 
  flattened 
  ventrally, 
  convex 
  dorsally, 
  attenu- 
  

   ated 
  and 
  more 
  or 
  less 
  elongated 
  posteriorly, 
  having 
  a 
  characteristic 
  

   rough, 
  hirsute 
  aspect, 
  covered 
  with 
  cylindrical, 
  fusiform 
  to 
  claviform 
  

   papillae, 
  longer 
  dorsally 
  than 
  ventrally, 
  usually 
  encrusted 
  with 
  sand 
  

   grains 
  more 
  basally, 
  with 
  distal 
  tips 
  bare; 
  there 
  are 
  all 
  gradations: 
  

   Without 
  encrusting 
  sand 
  (looks 
  "hairy"), 
  with 
  scattered 
  sand 
  grains, 
  

   and 
  with 
  rather 
  thick 
  layer 
  of 
  sand 
  grains, 
  usually 
  fewer 
  on 
  antero- 
  

   ventral 
  part. 
  Underlying 
  surface 
  nodular 
  and, 
  in 
  larger 
  specimens, 
  

   outer 
  papillate 
  layer 
  may 
  be 
  worn 
  off, 
  the 
  surface 
  appearing 
  rugose, 
  

   with 
  low 
  mounds. 
  Retractile 
  prostomium 
  and 
  buccal 
  region 
  with 
  two 
  

   groups 
  of 
  numerous 
  filiform 
  branchiae 
  borne 
  on 
  pair 
  of 
  dorsolateral 
  

   bosses, 
  pair 
  of 
  thick 
  grooved 
  palps, 
  and 
  ventral 
  eversible 
  buccal 
  siphon 
  

   around 
  mouth. 
  Setae 
  of 
  first 
  setigerous 
  segment 
  8-10 
  per 
  bundle, 
  

   slightly 
  more 
  elongate 
  than 
  following, 
  directed 
  anteriorly. 
  Notopodia 
  

   and 
  neuropodia 
  distinct, 
  with 
  long 
  fusiform 
  papillae 
  grouped 
  around 
  

   setae. 
  Notosetae 
  long, 
  capillary, 
  ringed, 
  2-5 
  in 
  number. 
  Neurosetae 
  

   beginning 
  on 
  setiger 
  2, 
  large, 
  3-6 
  in 
  number, 
  amber-colored, 
  ending 
  in 
  

   sharp, 
  transparent, 
  and 
  fragile 
  tips. 
  Pair 
  of 
  nephridial 
  papillae 
  near 
  

   anterior 
  border 
  of 
  ventral 
  side 
  of 
  setiger 
  5. 
  Color: 
  In 
  life 
  and 
  in 
  

   alcohol: 
  Brownish, 
  dull 
  sandy-mud. 
  

  

  Remarks. 
  — 
  The 
  types 
  of 
  Brada 
  setosa 
  Verrill 
  from 
  Massachusetts, 
  

   B. 
  pilosa 
  Moore 
  from 
  Alaska, 
  and 
  Stylaroides 
  plurihranchiata 
  Moore 
  

   from 
  California 
  were 
  examined 
  and 
  are 
  hereui 
  referred 
  to 
  B. 
  villosa. 
  

   The 
  excessive 
  "hairiness" 
  of 
  B. 
  pilosa 
  appears 
  to 
  be 
  a 
  variable 
  charac- 
  

   ter; 
  there 
  may 
  be 
  varying 
  numbers 
  of 
  papillae 
  as 
  well 
  as 
  all 
  gradations 
  

   in 
  the 
  amount 
  of 
  encrusting 
  sand 
  grains. 
  Two 
  large 
  specimens 
  washed 
  

   ashore 
  at 
  Point 
  Barrow 
  were 
  at 
  first 
  identified 
  as 
  B. 
  rugosa, 
  following 
  

   St0p-Bowitz 
  (1948); 
  they 
  agree 
  in 
  the 
  large 
  size 
  (23-24 
  setigers, 
  28-30 
  

   mm. 
  long, 
  5-7 
  mm. 
  wide), 
  the 
  almost 
  complete 
  absence 
  of 
  papulation, 
  

   and 
  the 
  thick 
  rugose 
  surface; 
  the 
  outer 
  surface, 
  however, 
  appears 
  to 
  be 
  

   worn 
  off. 
  There 
  are 
  some 
  remains 
  of 
  the 
  papillated 
  surface 
  on 
  the 
  

   parapodial 
  lobes. 
  Thus 
  B. 
  rugosa 
  (including 
  T. 
  arctica) 
  is 
  herein 
  

   referred 
  to 
  B. 
  villosa, 
  where 
  it 
  has 
  been 
  referred 
  earlier 
  by 
  Fauvel 
  and 
  

   others. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Point 
  Barrow 
  base, 
  washed 
  ashore 
  

   September 
  22, 
  1949 
  (22 
  specimens), 
  August 
  10, 
  1950 
  (2 
  specimens); 
  off 
  

   Point 
  Barrow 
  base, 
  up 
  to 
  4 
  mUes 
  from 
  shore, 
  27-29 
  fms., 
  on 
  various 
  

   combinations 
  of 
  mud, 
  gravel, 
  stones, 
  rocks 
  (2 
  stations, 
  2 
  specimens), 
  

   Bering 
  Sea: 
  62°15' 
  N., 
  167°48' 
  W., 
  Stoney, 
  1884; 
  Albatross 
  Sta. 
  3337, 
  

   53°55' 
  N., 
  163°26' 
  W., 
  280 
  fms., 
  1890. 
  West 
  Coast 
  North 
  America: 
  

   Washington 
  Sound, 
  Pettibone; 
  Albatross 
  Sta., 
  northwest 
  West 
  Point, 
  

   Elliot 
  Bay, 
  Seattle, 
  1914. 
  East 
  Coast 
  North 
  America: 
  Off 
  Nova 
  

  

  