﻿342 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  well-developed 
  palmar 
  membrane; 
  tips 
  of 
  filaments 
  limbate. 
  Thora- 
  

   cic 
  setigers 
  8 
  (7-9). 
  Thoracic 
  notopodia 
  with 
  limbate 
  capillary 
  setae; 
  

   nem-opodia 
  with 
  crotchets 
  with 
  long 
  manubrium 
  (may 
  disappear). 
  

   Abdomen 
  without 
  projecting 
  tori; 
  avicular 
  uncini 
  in 
  an 
  almost 
  com- 
  

   plete 
  circle; 
  with 
  capillary 
  neurosetae. 
  With 
  one 
  to 
  several 
  lateral 
  

   eye-spots 
  behind 
  each 
  parapodia. 
  Pygidium 
  with 
  anus 
  terminal, 
  

   with 
  rounded, 
  bulbous 
  dorsal 
  valve 
  with 
  lateral 
  groups 
  of 
  eye-spots. 
  

   Color: 
  In 
  alcohol: 
  Body 
  irregularly 
  speckled 
  reddish 
  brown, 
  with 
  

   branchiae 
  violet 
  distally. 
  Tube: 
  Gelatinous, 
  transparent, 
  very 
  

   firm 
  and 
  elastic, 
  may 
  be 
  quite 
  thick. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  up 
  to 
  4,25 
  

   miles 
  from 
  shore, 
  25-35.5 
  fms., 
  on 
  bottoms 
  of 
  mud 
  with 
  gravel 
  (2 
  

   stations, 
  2 
  specimens). 
  West 
  Coast 
  North 
  America: 
  Washington 
  

   and 
  Puget 
  Sounds, 
  low 
  water 
  to 
  165 
  fms., 
  Pettibone. 
  East 
  Coast 
  

   North 
  America: 
  Off 
  Nova 
  Scotia, 
  Maine, 
  Massachusetts, 
  9-90 
  

   fms., 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Scattered 
  records 
  in 
  the 
  Arctic: 
  Arctic 
  Alaska, 
  

   West 
  Greenland, 
  Novaya 
  Zemlya. 
  Also 
  Iceland, 
  Finland, 
  to 
  English 
  

   Channel, 
  Mediterranean, 
  Adriatic; 
  Nova 
  Scotia 
  to 
  Massachusetts; 
  

   Bering 
  Sea 
  to 
  California; 
  Japan. 
  In 
  low 
  water 
  to 
  287 
  fathoms. 
  

  

  Family 
  Serpulidae 
  

  

  Body 
  cylindrical 
  or 
  fusiform, 
  slightly 
  flattened. 
  Prostomium 
  indis- 
  

   tinct. 
  Buccal 
  region 
  with 
  mouth 
  terminal, 
  with 
  two 
  transverse 
  lips, 
  

   palps 
  absent 
  or 
  slightly 
  developed. 
  Branchiae 
  form 
  a 
  terminal 
  funnel- 
  

   like 
  plume 
  around 
  mouth, 
  formed 
  of 
  two 
  semicircular 
  or 
  spiralled 
  

   lobes 
  bearing 
  few 
  to 
  numerous 
  filaments, 
  each 
  with 
  two 
  rows 
  of 
  ciliated 
  

   barbules 
  (fig. 
  39, 
  u). 
  Usually 
  with 
  one 
  or 
  two 
  opercula 
  (calcareous, 
  

   horny, 
  or 
  membranous) 
  formed 
  on 
  the 
  first 
  dorsal 
  filaments 
  of 
  the 
  

   branchial 
  lobes. 
  Usually 
  with 
  a 
  collarette 
  on 
  first 
  segment. 
  Body 
  

   divided 
  into 
  two 
  regions: 
  (1) 
  thoracic; 
  with 
  few 
  segments 
  (3-7), 
  with 
  

   dorsal 
  bundles 
  of 
  capillary 
  setae 
  and 
  ventral 
  uncinigerous 
  tori; 
  usually 
  

   with 
  a 
  thoracic 
  membrane; 
  (2) 
  abdominal; 
  with 
  inversion 
  of 
  setae, 
  

   dorsal 
  uncinigerous 
  tori 
  and 
  ventral 
  capillary 
  setae. 
  A 
  wide, 
  shallow, 
  

   longitudinal 
  ciliated 
  faecal 
  groove, 
  ventral 
  in 
  abdominal 
  region, 
  dorsal 
  

   in 
  thoracic. 
  Tube 
  cylindrical 
  or 
  polygonal, 
  calcareous, 
  opaque 
  or 
  

   rarely 
  transparent, 
  fixed 
  to 
  substratum 
  (rarely 
  free). 
  

  

  Represented 
  by 
  a 
  single 
  genus 
  and 
  two 
  species 
  (two 
  subgenera) 
  at 
  

   Point 
  Barrow. 
  

  

  C^nus 
  Spirorbis 
  Daudin, 
  1800 
  

  

  Both 
  species 
  are 
  of 
  smaU 
  size, 
  asymmetrical 
  and 
  coiled. 
  Branchial 
  

   lobes 
  each 
  with 
  3-5 
  filaments. 
  A 
  single, 
  partly 
  calcareous 
  operculum 
  

  

  