﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  279 
  

  

  setae 
  with 
  capillary 
  tips; 
  some 
  of 
  these 
  setae 
  in 
  the 
  lower 
  part 
  of 
  the 
  

   neuropodial 
  bundle 
  may 
  be 
  worn 
  down, 
  with 
  blunt 
  tips 
  resembling 
  

   crotchets. 
  These 
  so-called 
  crotchets 
  may 
  be 
  more 
  or 
  less 
  numerous 
  

   on 
  all 
  thoracic 
  segments 
  or 
  on 
  some 
  only, 
  or 
  may 
  be 
  lacking. 
  Ab- 
  

   dominal 
  region 
  having 
  an 
  exceedingly 
  straggly 
  appearance 
  with 
  the 
  

   dorsally 
  directed 
  branchiae 
  and 
  parapodial 
  lobes; 
  notopodia 
  with 
  

   erect, 
  digitiform 
  postsetal 
  lobes 
  and 
  capillary 
  crenulate 
  setae 
  and 
  

   sometimes 
  also 
  with 
  forked 
  setae; 
  neuropodia 
  with 
  two 
  conical, 
  

   unequal 
  lips, 
  with 
  capillary 
  crenulate 
  setae 
  and 
  an 
  elongate 
  thickened 
  

   parapodial 
  flange 
  below 
  the 
  neuropodial 
  lobe. 
  On 
  the 
  last 
  few 
  thoracic 
  

   and 
  first 
  few 
  abdominal 
  segments 
  there 
  may 
  be 
  one 
  or 
  two 
  extra 
  

   conical 
  podal 
  lobes, 
  one 
  at 
  the 
  level 
  of 
  the 
  lower 
  part 
  of 
  the 
  neuropodial 
  

   setae 
  and 
  one 
  subpodal; 
  they 
  are 
  in 
  the 
  transitional 
  region 
  of 
  thoracic 
  

   and 
  abdominal 
  regions 
  and 
  become 
  part 
  of 
  the 
  parapodial 
  flanges 
  of 
  

   the 
  abdominal 
  segments. 
  Without 
  intermediate 
  interramal 
  cirri, 
  

   but 
  with 
  lateral, 
  ciliated 
  organs 
  between 
  the 
  rami. 
  Pygidium 
  with 
  

   two 
  filiform 
  anal 
  cirri. 
  Proboscis 
  soft, 
  more 
  or 
  less 
  lobed. 
  Color: 
  

   In 
  alcohol: 
  Without 
  color 
  or 
  yellowish 
  brown, 
  with 
  darker 
  areas 
  on 
  

   the 
  elongate 
  neuropodial 
  flanges 
  of 
  the 
  abdominal 
  region 
  and 
  on 
  the 
  

   branchiae. 
  

  

  Remarks. 
  — 
  Haploscoloplos 
  alaskensis 
  Hartman 
  from 
  southwestern 
  

   Alaska 
  is 
  herein 
  referred 
  to 
  S. 
  armiger. 
  It 
  differs 
  from 
  the 
  typical 
  

   S. 
  armiger 
  in 
  lacking 
  crotchets 
  in 
  the 
  thoracic 
  neuropodia. 
  As 
  

   indicated 
  previously 
  by 
  Fauvel 
  (1914) 
  and 
  others, 
  this 
  seems 
  to 
  be 
  a 
  

   variable 
  character, 
  perhaps 
  associated 
  with 
  the 
  substratum 
  and 
  age. 
  

   The 
  crotchets 
  were 
  not 
  present 
  on 
  small 
  specimens 
  from 
  Point 
  Barrow, 
  

   and 
  they 
  may 
  be 
  more 
  numerous 
  in 
  some 
  parapodia 
  than 
  in 
  others 
  

   and 
  more 
  abundant 
  in 
  the 
  lower 
  part 
  of 
  the 
  neuropodia; 
  they 
  appear 
  

   to 
  be 
  worn 
  crenulate 
  capillary 
  setae. 
  On 
  certain 
  substrata, 
  pre- 
  

   sumably, 
  the 
  setae 
  may 
  not 
  be 
  worn 
  and 
  thus 
  the 
  so-called 
  crotchets 
  

   are 
  absent. 
  

  

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

   Point 
  Barrow; 
  west 
  side 
  Elson 
  Lagoon 
  near 
  entrance 
  to 
  small 
  lagoon 
  

   to 
  the 
  west, 
  1.2 
  fms.; 
  off 
  Point 
  Barrow 
  base, 
  up 
  to 
  12.1 
  mQes 
  from 
  

   shore, 
  1.7-75.5 
  fms., 
  on 
  bottoms 
  of 
  mud, 
  stones, 
  and 
  various 
  com- 
  

   binations 
  of 
  mud, 
  gravel, 
  stones, 
  rocks, 
  large 
  perforated 
  rocks 
  (12 
  

   stations, 
  19 
  specimens). 
  Between 
  Icy 
  Cape 
  and 
  Cape 
  Lisbume, 
  

   15-20 
  fms., 
  mud, 
  sand, 
  Dall, 
  1874. 
  East 
  Coast 
  North 
  America: 
  

   Bay 
  of 
  Fundy, 
  Maine, 
  Massachusetts, 
  13—48 
  fms., 
  U. 
  S. 
  Fish 
  

   Commission. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Arctic: 
  Siberian 
  and 
  

   Alaskan 
  Arctic, 
  Davis 
  Strait, 
  Greenland, 
  Jan 
  Mayen, 
  Spitsbergen, 
  

   Franz 
  Josef 
  Land, 
  White 
  Sea, 
  Novaya 
  Zemlya, 
  Kara 
  Sea. 
  Also 
  

   Iceland, 
  Faroes, 
  Shetlands 
  to 
  France, 
  Mediterranean; 
  Labrador 
  to 
  

  

  