﻿280 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  Massachusetts; 
  southern 
  Alaska 
  to 
  British 
  Columbia; 
  Japan; 
  South 
  

   Pacific 
  (Chile); 
  Antarctic; 
  off 
  South 
  Africa. 
  In 
  low 
  water 
  to 
  1,100 
  

   fathoms. 
  

  

  Family 
  Spionidae 
  

  

  Body 
  vermiform, 
  without 
  distinct 
  regions. 
  Prostomium 
  small, 
  

   elongated, 
  scarcely 
  separated 
  from 
  an 
  enlarged 
  peristomium 
  lateral 
  to 
  

   prostomium, 
  with 
  or 
  without 
  eyes 
  (usually 
  four), 
  antennae 
  usually 
  

   lacking 
  (may 
  be 
  a 
  small 
  occipital 
  antenna), 
  two 
  very 
  long, 
  extensile, 
  

   tentaculiform, 
  longitudinally 
  grooved, 
  easily 
  deciduous 
  palps 
  (fig. 
  

   32, 
  /, 
  i, 
  I, 
  r) 
  . 
  Parapodia 
  biramous, 
  with 
  dorsal 
  and 
  ventral 
  postsetal 
  

   lamellae 
  more 
  or 
  less 
  developed; 
  dorsal 
  and 
  ventral 
  cirri 
  lacking 
  

   (fig. 
  32, 
  g, 
  s). 
  With 
  ligulate 
  or 
  cirriform 
  dorsal 
  branchiae 
  on 
  upper 
  

   part 
  of 
  parapodial 
  bases 
  on 
  a 
  certain 
  number 
  of 
  segments 
  (rarely 
  

   pinnate, 
  rarely 
  lacking). 
  Setae 
  simple 
  capillaries 
  and 
  hooded 
  

   crotchets 
  (fig. 
  32, 
  h, 
  k, 
  q). 
  Pygidium 
  terminated 
  in 
  an 
  anal 
  cup 
  

   (fig. 
  32, 
  p) 
  or 
  anal 
  cirri. 
  Proboscis 
  short, 
  scarcely 
  or 
  somewhat 
  

   protrusible, 
  may 
  be 
  somewhat 
  lobulated. 
  

  

  Represented 
  by 
  four 
  genera 
  and 
  four 
  species 
  from 
  Point 
  Barrow. 
  

   All 
  genera 
  have 
  branchiae 
  present 
  on 
  certain 
  segments 
  and 
  prostomia 
  

   without 
  frontal 
  horns. 
  

  

  Key 
  to 
  the 
  genera 
  of 
  Spionidae 
  from 
  Point 
  Barrow 
  

  

  1. 
  Setigerous 
  segment 
  5 
  strongly 
  modified 
  with 
  special 
  large 
  amber-colored 
  

  

  setae 
  and 
  without 
  dorsal 
  and 
  ventral 
  lamellae 
  (fig. 
  32, 
  m, 
  n). 
  Branchiae 
  

   numerous, 
  paired, 
  dorsal, 
  simple, 
  straplike. 
  Notopodia 
  with 
  capillary 
  

   setae 
  only; 
  neuropodia 
  with 
  capillary 
  setae 
  and 
  hooded 
  bidentate 
  crotchets 
  

   beginning 
  on 
  setigers 
  7 
  or 
  8 
  (fig. 
  32, 
  q). 
  Pygidium 
  ending 
  in 
  anal 
  cup 
  

  

  (fig. 
  32, 
  p) 
  Polydora 
  (p. 
  280) 
  

  

  Setigerous 
  segment 
  5 
  not 
  modified 
  2 
  

  

  2. 
  Branchiae 
  on 
  only 
  few 
  anterior 
  segments, 
  3-11 
  pairs, 
  often 
  pinnate 
  (fig. 
  

  

  32, 
  j), 
  beginning 
  on 
  setiger 
  2. 
  Capillary 
  setae 
  and 
  hooded 
  crotchets 
  in 
  both 
  

  

  noto- 
  and 
  neuropodia. 
  Pygidium 
  with 
  anal 
  cirri 
  Prionospio 
  (p. 
  282) 
  

  

  Branchiae 
  more 
  numerous, 
  simple, 
  straplike. 
  Notopodia 
  with 
  capillary 
  setae 
  

   only; 
  neuropodia 
  with 
  capillary 
  setae 
  and 
  hooded 
  crotchets 
  3 
  

  

  3. 
  Branchiae 
  begin 
  on 
  setiger 
  1, 
  continuing 
  up 
  to 
  last 
  setigers. 
  Pygidium 
  with 
  

  

  anal 
  cirri 
  Spio 
  (p. 
  284) 
  

  

  Branchiae 
  begin 
  on 
  setiger 
  2, 
  continuing 
  on 
  large 
  number 
  of 
  segments. 
  Py- 
  

   gidium 
  with 
  anal 
  cup, 
  may 
  be 
  somewhat 
  lobulated 
  Nerinides 
  (p. 
  285) 
  

  

  Genus 
  Polydora 
  Rose, 
  1801 
  

   Polydora 
  caulleryi 
  Mesril, 
  1897 
  

  

  Figure 
  32, 
  l-q 
  

  

  Polydora 
  caulleryi 
  Mesnil, 
  1897, 
  p. 
  88, 
  pi. 
  3, 
  figs. 
  12-16.— 
  Fauvel, 
  1927, 
  p. 
  54, 
  

  

  fig. 
  19, 
  f-h. 
  

   Polydora 
  brachycephala 
  Hartman, 
  1936c, 
  p. 
  48, 
  figs. 
  3-5; 
  1944b, 
  p. 
  258. 
  

  

  