﻿284 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  mens). 
  West 
  Coast 
  North 
  America: 
  Puget 
  Sound, 
  Washington, 
  

   low 
  water, 
  mud, 
  Pettibone. 
  East 
  Coast 
  North 
  America: 
  Off 
  

   Labrador, 
  40 
  fms,, 
  Blue 
  Dolphin 
  Expedition, 
  1949; 
  off 
  New 
  Hamp- 
  

   shire 
  and 
  Massachusetts, 
  25-48 
  fms., 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Arctic 
  Alaska 
  to 
  Washington; 
  north 
  Japan 
  Sea; 
  

   Iceland, 
  Norway 
  to 
  Mediterranean; 
  Labrador 
  to 
  Massachusetts; 
  

   South 
  Africa. 
  In 
  low 
  water 
  to 
  250 
  fathoms; 
  surface. 
  

  

  Genus 
  Spio 
  Fabricius, 
  1785 
  

   Spiofilicornis 
  (Miiller, 
  1776) 
  

  

  Figure 
  32, 
  f-h 
  

  

  Nereis 
  filicornis 
  Miiller, 
  1776, 
  p. 
  218. 
  

  

  Spio 
  filicornis 
  Malmgren, 
  1867, 
  p. 
  91, 
  pi. 
  1, 
  fig. 
  1. 
  — 
  Eliason, 
  1920, 
  p. 
  40, 
  figs. 
  

   7-9.— 
  Fauvel, 
  1927, 
  p. 
  43, 
  fig. 
  15, 
  a-g.— 
  Augener, 
  1928, 
  p. 
  738, 
  pi. 
  11, 
  fig. 
  7.— 
  

   Annenkova, 
  1937, 
  p. 
  169; 
  1938, 
  p. 
  173.— 
  Hartman, 
  1941a, 
  p. 
  293; 
  1948, 
  p. 
  

   36.— 
  Berkeley 
  and 
  Berkeley, 
  1943, 
  p. 
  130.— 
  Thorson, 
  1946, 
  p. 
  93, 
  fig. 
  46.— 
  

   Zatsepin, 
  1948, 
  p. 
  132, 
  pi. 
  32, 
  fig. 
  11.— 
  Wesenberg-Lund, 
  1950a, 
  p. 
  30; 
  

   1950b, 
  p. 
  76; 
  1951, 
  p. 
  71. 
  

  

  Spio 
  limicola 
  Verrill, 
  1879, 
  p. 
  176. 
  

  

  Spio 
  filicornis 
  var. 
  pacifica 
  Berkeley 
  and 
  Berkeley, 
  1936, 
  p. 
  475; 
  1952, 
  p. 
  25, 
  figs. 
  

   47, 
  48. 
  

  

  Description. 
  — 
  Up 
  to 
  30 
  mm. 
  long, 
  2 
  mm. 
  wide. 
  Prostomium 
  bell- 
  

   shaped 
  to 
  conical, 
  widest 
  anteriorly, 
  rounded, 
  tapered 
  posteriorly 
  to 
  

   short 
  crest 
  extending 
  on 
  first 
  two 
  setigers. 
  Four 
  eyes 
  in 
  trapezoidal 
  

   arrangement, 
  anterior 
  pair 
  larger. 
  Two 
  palps 
  missing 
  (in 
  alcohol). 
  

   A 
  short, 
  eversible, 
  somewhat 
  lobulated 
  proboscidial 
  region. 
  Branchiae 
  

   begin 
  on 
  setiger 
  1, 
  continuing 
  to 
  posterior 
  end, 
  simple, 
  straplike. 
  

   Dorsal 
  postsetal 
  lamellae 
  of 
  more 
  anterior 
  segments 
  short, 
  wide, 
  with 
  

   branchiae 
  fused 
  to 
  upper 
  sides; 
  in 
  more 
  posterior 
  segments, 
  lamellae 
  

   cirriform, 
  separate 
  from 
  branchiae. 
  Ventral 
  postsetal 
  lamellae 
  

   rounded, 
  not 
  notched. 
  Capillary 
  setae 
  only 
  in 
  notopodia. 
  Neuropodia 
  

   with 
  hooded, 
  bidentate 
  crotchets 
  beginning 
  on 
  setigers 
  9-18, 
  about 
  six 
  

   in 
  number 
  (5-10). 
  Pygidium 
  with 
  four 
  cirri? 
  Color: 
  In 
  alcohol: 
  

   Yellowish 
  white 
  with 
  dark 
  brown 
  pigment 
  on 
  peristomial 
  region 
  and 
  

   along 
  each 
  side 
  of 
  anterior 
  fourth 
  of 
  body. 
  

  

  Remarks. 
  — 
  The 
  types 
  of 
  Spio 
  limicola 
  Verrill 
  from 
  Cape 
  Cod 
  Bay 
  

   were 
  examined 
  and 
  are 
  herein 
  referred 
  to 
  S. 
  jilicornis. 
  S. 
  limicola 
  

   differs 
  from 
  S. 
  setosa 
  Verrill, 
  to 
  which 
  it 
  has 
  been 
  referred 
  (Hart- 
  

   man, 
  1942, 
  p. 
  63), 
  in 
  the 
  number 
  of 
  neuropodial 
  hooded 
  crotchets, 
  

   6-9 
  in 
  S. 
  limicola 
  and 
  about 
  16 
  in 
  ^S. 
  setosa. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  8 
  

   miles 
  from 
  shore, 
  36-75.5 
  fms., 
  on 
  various 
  combinations 
  of 
  gravel, 
  

   rocks, 
  stones, 
  large 
  perforated 
  rocks 
  (2 
  stations, 
  2 
  specimens) 
  . 
  West 
  

   Coast 
  North 
  America: 
  Washington 
  Sound, 
  low 
  water, 
  Pettibone. 
  

   East 
  Coast 
  North 
  America: 
  Off 
  Massachusetts, 
  15-31 
  fms., 
  U. 
  S. 
  

   Fish 
  Commission. 
  

  

  