﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  315 
  

  

  ventral 
  or 
  anal 
  cirri. 
  Tube 
  membranous, 
  covered 
  with 
  mud 
  or 
  ag- 
  

   glutinated 
  foreign 
  bodies. 
  

  

  Eepresented 
  by 
  two 
  genera 
  and 
  four 
  species 
  at 
  Point 
  Barrow. 
  

   Both 
  genera 
  have 
  prostomia 
  trilobed, 
  without 
  projecting 
  glandular 
  

   crests; 
  oral 
  tentacles 
  numerous, 
  pinnate; 
  without 
  large 
  dorsal 
  hooks 
  

   posterior 
  to 
  branchiae; 
  branchiae 
  four 
  pairs, 
  filiform 
  or 
  subulate, 
  

   arising 
  on 
  or 
  near 
  a 
  distinct 
  transverse 
  dorsal 
  ridge; 
  thoracic 
  setigers 
  

   14; 
  uncinigerous 
  pinnules 
  begin 
  on 
  setiger 
  3; 
  notopodia 
  without 
  

   claviform 
  cirri. 
  

  

  Key 
  to 
  the 
  genera 
  of 
  Ampharetidae 
  from 
  Point 
  Barrow 
  

  

  1. 
  With 
  paleae, 
  lateral 
  group 
  of 
  golden 
  setae 
  anterior 
  to 
  branchiae 
  (fig. 
  36, 
  

  

  o, 
  b) 
  Ampharete 
  (p. 
  315) 
  

  

  Without 
  paleae 
  Asabellides 
  (p. 
  318) 
  

  

  Genus 
  Ampharete 
  Malmgren, 
  1865 
  

  

  All 
  three 
  species 
  have 
  prostomium 
  distinctly 
  trilobed; 
  median 
  lobe 
  

   with 
  pair 
  of 
  basal 
  eyes, 
  lateral 
  lobes 
  encircling 
  median 
  lobe 
  posteriorly 
  

   (fig. 
  36, 
  a). 
  First 
  two 
  segments 
  achaetous; 
  first 
  or 
  buccal 
  segment 
  

   extended 
  anteroventrally 
  forming 
  large 
  lower 
  lip. 
  Segment 
  3 
  or 
  

   paleal 
  segment 
  with 
  group 
  of 
  paleae 
  an*anged 
  in 
  semicircle 
  just 
  ante- 
  

   rior 
  and 
  lateral 
  to 
  branchiae. 
  Abdominal 
  segments 
  with 
  neuropodial 
  

   cirri 
  dorsally 
  on 
  uncinigerous 
  pinnules 
  poorly 
  developed 
  (short, 
  

   rounded 
  to 
  conical) 
  to 
  well 
  developed 
  (cirrif 
  orm, 
  longer 
  than 
  pinnule) 
  . 
  

  

  Key 
  to 
  the 
  species 
  of 
  Ampharete 
  from 
  Point 
  Barrow 
  

  

  1. 
  First 
  2 
  abdominal 
  segments 
  with 
  enlarged, 
  padlike, 
  achaetous 
  notopodial 
  

  

  lobes 
  A. 
  vega 
  

  

  Without 
  enlarged 
  notopodial 
  lobes 
  on 
  first 
  few 
  abdominal 
  segments 
  2 
  

  

  2. 
  Paleae 
  slender, 
  taper 
  gradually. 
  Abdominal 
  setigers 
  12, 
  usually 
  with 
  promi- 
  

  

  nent 
  neuropodial 
  cirri. 
  Anal 
  cirri 
  numerous 
  (fig. 
  36, 
  c) 
  A. 
  acutifrons 
  

  

  Paleae 
  taper 
  rather 
  abruptly, 
  with 
  short 
  mucronate 
  tips. 
  Abdominal 
  setigers 
  

   16-17, 
  with 
  neuropodial 
  cirri 
  inconspicuous. 
  Anal 
  cirri 
  2 
  A. 
  goesi 
  

  

  Ampharete 
  vega 
  (Wiren, 
  1883) 
  

  

  Figure 
  36, 
  a 
  

  

  Amphideis 
  vega 
  Wir6n, 
  1883, 
  p. 
  415, 
  pi. 
  32, 
  figs. 
  3, 
  4. 
  

  

  Ampharete 
  vega 
  Hessle, 
  1917, 
  p. 
  99. 
  — 
  Augener, 
  1928, 
  p. 
  778. 
  — 
  Annenkova, 
  1929, 
  

   p. 
  493.— 
  Zatsepin, 
  1948, 
  p. 
  150. 
  

  

  Description. 
  — 
  Length 
  16 
  mm., 
  width 
  1.5 
  mm. 
  (up 
  to 
  50 
  mm. 
  long, 
  

   4 
  mm. 
  wide 
  — 
  Wiren, 
  1883). 
  Paleae 
  slender, 
  tapering 
  gradually 
  to 
  

   fine 
  tips, 
  10-13 
  in 
  each 
  group. 
  Eight 
  branchiae 
  form 
  continuous 
  

   transverse 
  group, 
  arising 
  from 
  low 
  fold. 
  Abdominal 
  segments 
  up 
  to 
  

   27-28 
  (16 
  in 
  Point 
  Barrow 
  specimen; 
  complete?). 
  First 
  two 
  abdom- 
  

  

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  8 
  

  

  