﻿298 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  T. 
  brevis 
  Moore). 
  With 
  lateral 
  sensory 
  pits 
  between 
  rami 
  appearing 
  

   as 
  small 
  oval 
  slits. 
  Nephridial 
  pores 
  ventral 
  to 
  nem-opodia 
  on 
  setigers 
  

   3-14. 
  Pygidium 
  small, 
  cylindrical, 
  longitudinally 
  fmrowed. 
  Color: 
  

   In 
  life: 
  Flesh. 
  In 
  alcohol: 
  Whitish. 
  

  

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

   October 
  16, 
  17, 
  1949; 
  August 
  10, 
  1950 
  (12 
  specimens). 
  East 
  Coast 
  

   North 
  America: 
  Off 
  Massachusetts, 
  Long 
  Island 
  Sound, 
  3-19 
  fms., 
  

   soft 
  mud, 
  U. 
  S, 
  Fish 
  Commission; 
  Woods 
  Hole 
  region, 
  Massachusetts, 
  

   Pettibone, 
  1950. 
  

  

  Distribution. 
  — 
  Arctic 
  Alaska. 
  Massachusetts 
  to 
  Long 
  Island 
  Sound. 
  

   In 
  3-19 
  fathoms. 
  

  

  Family 
  Capitellidae 
  

  

  Body 
  cylindrical, 
  wealdy 
  divided 
  into 
  2 
  regions: 
  Anterior 
  thoracic 
  

   region 
  somewhat 
  inflated, 
  often 
  reticulated, 
  parapodial 
  lobes 
  rudi- 
  

   mentary; 
  posterior 
  abdominal 
  region 
  longer 
  and 
  thinner, 
  with 
  rows 
  

   of 
  crotchets 
  on 
  somewhat 
  inflated 
  tori. 
  Prostomium 
  conical, 
  more 
  

   or 
  less 
  retractile, 
  without 
  appendages, 
  with 
  or 
  without 
  eyes, 
  with 
  

   pair 
  of 
  eversible 
  nuchal 
  organs. 
  Buccal 
  segment 
  achaetous 
  (may 
  be 
  

   fused 
  with 
  prostomium 
  as 
  in 
  Capitella). 
  Parapodia 
  biramous, 
  re- 
  

   duced 
  to 
  bundles 
  of 
  capillary 
  setae 
  or 
  to 
  dorsal 
  and 
  ventral 
  tori 
  

   bearing 
  row 
  of 
  crotchets 
  which 
  have 
  long 
  manubrium 
  and 
  recurved 
  

   hooded 
  rostrum 
  (fig. 
  33, 
  r-^). 
  Without 
  dorsal, 
  ventral, 
  or 
  anal 
  cirri. 
  

   With 
  or 
  without 
  branchiae. 
  Proboscis 
  eversible, 
  globular, 
  unarmed, 
  

   papillate. 
  Constructs 
  tubes. 
  

  

  Represented 
  by 
  a 
  single 
  species 
  from 
  Point 
  Barrow. 
  

  

  Genus 
  Capitella 
  Blainville, 
  1828 
  

   Capitella 
  capitata 
  (Fabricius, 
  1780) 
  

  

  Figure 
  33, 
  r-u 
  

  

  Lumbricus 
  capitatus 
  Fabricius, 
  1780, 
  p. 
  279. 
  

  

  Capitella 
  capitata 
  Webster 
  and 
  Benedict, 
  1884, 
  p. 
  730; 
  1887, 
  p. 
  744. 
  — 
  Ehlers, 
  

   1913, 
  p. 
  543.— 
  Eliason, 
  1920, 
  p. 
  63.— 
  Fauvel, 
  1927, 
  p. 
  154, 
  fig. 
  55, 
  a-h.— 
  

   Augener, 
  1928, 
  p. 
  749.— 
  Monro, 
  1930, 
  p. 
  163.— 
  Anneukova, 
  1934, 
  p. 
  322; 
  

   1937, 
  p. 
  179; 
  1938, 
  p. 
  189.— 
  Hartman, 
  1942a, 
  p. 
  69; 
  1944a, 
  pp. 
  334, 
  341, 
  

   pi. 
  34, 
  fig. 
  3; 
  1945, 
  p. 
  37; 
  1947, 
  p. 
  404, 
  pi. 
  43, 
  figs. 
  1, 
  2; 
  1948, 
  p. 
  41; 
  1951, 
  

   p. 
  101.— 
  Berkeley 
  and 
  Berkeley, 
  1943, 
  p. 
  129; 
  1952, 
  p. 
  100, 
  figs. 
  206-208.— 
  

   Gorbunov, 
  1946, 
  p. 
  39.— 
  Thorson, 
  1946, 
  p. 
  110, 
  fig. 
  60.— 
  Zatsepin, 
  1948, 
  

   p. 
  138, 
  pi. 
  33, 
  fig. 
  14. 
  — 
  Hartman 
  and 
  Reish, 
  1950, 
  p. 
  40. 
  — 
  Wesenberg-Lund, 
  

   1950a, 
  p. 
  39; 
  1950b, 
  p. 
  91; 
  1951, 
  p. 
  84. 
  

  

  Capitella 
  capitata 
  var. 
  antarctica 
  Monro, 
  1930, 
  p. 
  164. 
  

  

  Description. 
  — 
  Length 
  23 
  mm., 
  width 
  1 
  mm. 
  (up 
  to 
  120 
  mm. 
  — 
  

   Augener, 
  1928). 
  Body 
  attenuated 
  slightly 
  anteriorly, 
  much 
  more 
  

   so 
  posteriorly, 
  fragile. 
  Prostomium 
  and 
  achaetous 
  buccal 
  segment 
  

   fused, 
  forming 
  wide 
  obtuse 
  cone, 
  somewhat 
  flattened 
  dorsoventrally, 
  

  

  