﻿260 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  easily 
  and 
  losing 
  their 
  antennae 
  and 
  dorsal 
  cirri 
  readily. 
  Prostomium 
  

   subrectangular 
  to 
  suboval, 
  wider 
  than 
  long; 
  four 
  eyes 
  fairly 
  large, 
  in 
  

   trapezoidal 
  arrangement, 
  the 
  anterior 
  pair 
  larger; 
  palps 
  broad, 
  thick, 
  

   oval 
  to 
  squarish, 
  fused 
  at 
  their 
  bases 
  only 
  and 
  well 
  separated 
  distally, 
  

   and 
  may 
  be 
  curled 
  ventrally 
  or 
  longitudinally 
  like 
  flopping 
  ears; 
  

   lateral 
  antennae 
  about 
  1.5 
  times 
  the 
  prostomial 
  length; 
  median 
  

   antenna 
  about 
  twice 
  the 
  length 
  of 
  the 
  lateral 
  antennae 
  (fig. 
  28, 
  g). 
  

   Upper 
  tentacular 
  cirri 
  as 
  long 
  as 
  median 
  antenna, 
  ventral 
  pair 
  much 
  

   shorter. 
  Ventral 
  cirri 
  thick, 
  oval, 
  about 
  same 
  size 
  and 
  length 
  as 
  

   parapodial 
  lobes 
  or 
  may 
  be 
  slightly 
  shorter 
  (first 
  pair 
  not 
  enlarged, 
  

   similar 
  to 
  the 
  following). 
  Neuropodia 
  short 
  and 
  plump, 
  with 
  neuro- 
  

   setae 
  all 
  composite 
  except 
  on 
  the 
  last 
  setigers 
  where 
  there 
  may 
  be 
  a 
  

   simple, 
  entire, 
  upper 
  seta 
  and 
  a 
  simple, 
  bidentate, 
  lower 
  seta; 
  blades 
  of 
  

   composite 
  setae 
  rather 
  short, 
  hooked, 
  distinctly 
  bidentate, 
  finely 
  

   spinous 
  on 
  the 
  cutting 
  edge; 
  shaft 
  distally 
  spinous 
  (fig. 
  28, 
  i). 
  At 
  

   maturity, 
  with 
  long 
  capillary 
  swimming 
  setae. 
  Proboscis 
  with 
  two 
  

   rows 
  of 
  soft 
  papillae, 
  a 
  proximal 
  and 
  a 
  distal 
  row 
  of 
  10 
  papillae 
  per 
  

   row; 
  inside 
  the 
  distal 
  row, 
  a 
  chitinous 
  lining 
  provided 
  with 
  a 
  large, 
  

   triangular, 
  dorsal 
  tooth 
  and 
  a 
  denticled, 
  circular 
  margin 
  (fig. 
  28, 
  g, 
  h). 
  

  

  Key 
  to 
  the 
  species 
  of 
  Eusyllis 
  from 
  Point 
  Barrow 
  

  

  1. 
  Cirrophores 
  of 
  dorsal 
  cirri 
  not 
  prominent. 
  Tentacular 
  segment 
  with 
  a 
  wide 
  

   crescent-shaped 
  nuchal 
  lobe 
  covering 
  the 
  posterior 
  part 
  of 
  the 
  prostomium 
  

  

  (fig. 
  28, 
  g) 
  E. 
  blotnstrandi 
  

  

  Cirrophores 
  of 
  dorsal 
  cirri 
  prominent, 
  as 
  long 
  as 
  the 
  neuropodia. 
  Tentacular 
  

   segment 
  short, 
  without 
  nuchal 
  lobe 
  E. 
  magnifica 
  

  

  Eusyllis 
  blomstrandi 
  Malmgren, 
  1867 
  

  

  Figure 
  28, 
  g-i 
  

  

  Eusyllis 
  blomstrandi 
  Malmgren, 
  1867, 
  p. 
  40, 
  pi. 
  6, 
  fig. 
  43. 
  — 
  Fauvel, 
  1923, 
  p. 
  293, 
  

   fig. 
  112,h-m.— 
  Augener, 
  1928, 
  p. 
  721.— 
  Annenkova, 
  1938, 
  p. 
  153, 
  fig. 
  6.— 
  

   Wesenberg-Lund, 
  1947, 
  p. 
  11, 
  fig. 
  3; 
  1950a, 
  p. 
  16; 
  1950b, 
  p. 
  48; 
  1951, 
  p. 
  37.— 
  

   Berkeley 
  and 
  Berkeley, 
  1948, 
  p. 
  84, 
  fig. 
  126. 
  

  

  Eusyllis 
  monilicornis 
  Malmgren, 
  1867, 
  p. 
  41, 
  pi. 
  6, 
  fig. 
  44. 
  — 
  Verrill, 
  1881, 
  p. 
  319. 
  — 
  

   Zatsepin, 
  1948, 
  p. 
  116, 
  pi. 
  31, 
  fig. 
  6,b. 
  

  

  ? 
  Eusyllis 
  phosphorea 
  Hartman, 
  1942a, 
  p. 
  7; 
  1944a, 
  pp. 
  334, 
  338, 
  pi. 
  25, 
  fig. 
  4. 
  

  

  Syllis 
  monilicornis 
  Th6el, 
  1879, 
  p. 
  41, 
  pi. 
  3, 
  fig. 
  39. 
  

  

  Eusyllis 
  tubifex 
  Mcintosh, 
  1908, 
  p. 
  173, 
  figs.— 
  Southern, 
  1914, 
  p. 
  32 
  (not 
  Syllis 
  

   tubifex 
  Gosse, 
  1855). 
  

  

  Eusyllis 
  bloemstrandi 
  Friedrich, 
  1939, 
  p. 
  122. 
  

  

  Typosyllis 
  collaris 
  Hartman, 
  1948, 
  p. 
  23, 
  fig. 
  6,a-c. 
  

  

  Description. 
  — 
  Length 
  7-32 
  mm., 
  width 
  without 
  setae 
  0.8-1.2 
  mm., 
  

   segments 
  50-124. 
  Antennae, 
  tentacular 
  cirri, 
  anterior 
  dorsal 
  cirri, 
  

   and 
  long 
  anal 
  cirri 
  irregularly 
  annulated, 
  especially 
  distally, 
  more 
  or 
  

   less 
  smooth 
  basally; 
  the 
  more 
  posterior 
  dorsal 
  cirri 
  only 
  indistinctly 
  

   annulated 
  or 
  smooth. 
  First 
  few 
  dorsal 
  cirri 
  may 
  be 
  longer 
  than 
  body 
  

   width, 
  especially 
  the 
  first 
  pair 
  which 
  may 
  be 
  the 
  longest 
  appendage; 
  

  

  