﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  257 
  

  

  Remarks. 
  — 
  The 
  type 
  of 
  Oophylax 
  minuta 
  Treadwell 
  from 
  Foxe 
  

   Channel 
  was 
  examined 
  and 
  is 
  herein 
  referred 
  to 
  Sphaerosyllis 
  erinaceus; 
  

   although 
  not 
  mentioned 
  in 
  the 
  original 
  description, 
  the 
  specimen 
  has 
  a 
  

   median 
  antenna 
  (seen 
  with 
  difficulty 
  on 
  the 
  prepared 
  slide); 
  neuro- 
  

   setae 
  include 
  a 
  simple 
  seta 
  in 
  addition 
  to 
  the 
  compound 
  ones, 
  setiger 
  

   2 
  lacks 
  dorsal 
  cirri. 
  The 
  type 
  specimens 
  of 
  S. 
  longicauda 
  Webster 
  and 
  

   Benedict 
  from 
  Eastport, 
  Maine, 
  were 
  examined 
  also 
  but 
  they 
  are 
  

   unsatisfactory, 
  being 
  hardened, 
  shrunken, 
  and 
  covered 
  with 
  crystals; 
  

   the 
  description 
  is 
  fairly 
  complete 
  and 
  agrees 
  with 
  S. 
  erinaceus 
  as 
  

   does 
  the 
  description 
  by 
  Augener 
  of 
  S. 
  latipalpis 
  Levinsen. 
  The 
  

   record 
  by 
  Kioja 
  of 
  S. 
  erinaceus 
  from 
  Mexico 
  is 
  questioned 
  chiefly 
  

   because 
  of 
  the 
  position 
  of 
  the 
  eyes. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Off 
  Point 
  Barrow 
  base, 
  16.7-75.5 
  

   fms., 
  up 
  to 
  8 
  miles 
  from 
  shore, 
  on 
  bottoms 
  of 
  stones 
  and 
  various 
  

   combinations 
  of 
  gravel, 
  stones, 
  rocks, 
  large 
  perforated 
  rocks, 
  with 
  

   bryozoans 
  and 
  hydroids 
  (8 
  stations, 
  37 
  specimens). 
  East 
  Coast 
  

   North 
  America: 
  Off 
  Labrador, 
  25 
  fms.. 
  Blue 
  Dolphin 
  Expedition, 
  

   1949. 
  Vineyard 
  Sound, 
  Massachusetts, 
  surface, 
  U. 
  S. 
  Fish 
  Commis- 
  

   sion, 
  August 
  3, 
  1881. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Arctic: 
  Siberian 
  , 
  Alaskan, 
  

   and 
  Canadian 
  Arctic, 
  West 
  Greenland, 
  Spitsbergen. 
  Also 
  Iceland, 
  

   Denmark, 
  Ireland, 
  English 
  Channel, 
  Baltic; 
  Labrador 
  to 
  Mas- 
  

   sachusetts; 
  Bering 
  Sea; 
  north 
  Japan 
  Sea; 
  ? 
  Mexico. 
  In 
  low 
  water 
  

   to 
  75.5 
  fathoms; 
  sexual 
  forms 
  at 
  surface. 
  

  

  Genus 
  Exogone 
  Oersted, 
  1845 
  

  

  Both 
  species 
  represented 
  are 
  very 
  small, 
  slender, 
  linear-elongate, 
  

   tapered 
  slightly 
  anteriorly 
  and 
  more 
  so 
  posteriorly, 
  flattened 
  ventrally, 
  

   arched 
  dorsally. 
  Body 
  colorless, 
  translucent 
  (in 
  alcohol). 
  Pro- 
  

   stomium 
  oval 
  to 
  subrectangular, 
  arched 
  somewhat 
  anteriorly, 
  much 
  

   wider 
  than 
  long; 
  four 
  eyes, 
  with 
  lenses, 
  in 
  trapezoidal 
  arrangement; 
  

   palps 
  fused 
  dorsally 
  into 
  a 
  rounded 
  or 
  triangular 
  mass, 
  with 
  or 
  without 
  

   a 
  slight 
  anterior 
  notch; 
  palps 
  separated 
  ventrally 
  by 
  wide 
  depression. 
  

   Tentacular 
  segment 
  short, 
  more 
  or 
  less 
  distinct, 
  the 
  anterior 
  part 
  of 
  

   which 
  may 
  form 
  a 
  fold 
  covering 
  the 
  posterior 
  part 
  of 
  the 
  prostomium. 
  

   Dorsal 
  cirri 
  shorter 
  than 
  parapodial 
  lobes, 
  ovoid 
  to 
  somewhat 
  conical. 
  

   Ventral 
  cirri 
  digitiform, 
  shorter 
  than 
  parapodial 
  lobes. 
  Neurosetae 
  of 
  

   three 
  kinds: 
  (1) 
  upper 
  one 
  simple, 
  slightly 
  curved; 
  (2) 
  composite, 
  

   with 
  longer, 
  slender, 
  pointed 
  blades; 
  (3) 
  composite, 
  with 
  short, 
  hooked 
  

   blades. 
  Everted 
  pharynx 
  crowned 
  with 
  circle 
  of 
  papillae 
  and 
  single 
  

   conical 
  tooth. 
  With 
  swimming 
  setae 
  at 
  maturity. 
  Large 
  eggs, 
  

   embryos 
  or 
  young 
  (up 
  to 
  five 
  setigers, 
  resembling 
  the 
  adult) 
  attached 
  

   to 
  ventral 
  surface 
  of 
  female. 
  

  

  