﻿246 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  2. 
  Stem 
  Form: 
  Usually 
  with 
  2 
  dorsolateral 
  longitudinal 
  black 
  to 
  brown 
  bands 
  

   just 
  dorsal 
  to 
  bases 
  of 
  dorsal 
  cirri 
  (may 
  be 
  faint 
  or 
  absent); 
  with 
  short 
  

   semicircular 
  epaulettes 
  on 
  tentacular 
  segment 
  only. 
  Sexual 
  Stolons: 
  

   Colorless 
  or 
  female 
  stolon 
  dusk}'^, 
  especially 
  posteriorly; 
  male 
  stolon 
  rusty 
  

   brown, 
  darkest 
  on 
  anterior 
  region, 
  especially 
  laterally; 
  epaulettes 
  on 
  

  

  tentacular 
  segment 
  only 
  (fig. 
  29, 
  c-f) 
  A. 
  fallax 
  

  

  Stem 
  Form: 
  With 
  3 
  longitudinal 
  black 
  bands, 
  1 
  medium 
  and 
  2 
  lateral 
  at 
  same 
  

   level 
  as 
  bases 
  of 
  dorsal 
  cirri; 
  medium 
  band 
  continuous 
  throughout 
  length 
  of 
  

   body, 
  lateral 
  ones 
  may 
  fade 
  out 
  in 
  anterior 
  fourth 
  or 
  be 
  lacking; 
  with 
  semi- 
  

   circular 
  epaulettes 
  on 
  tentacular 
  segment 
  and 
  part 
  of 
  first 
  setiger 
  (fig. 
  29, 
  a). 
  

   Sexual 
  Stolons: 
  With 
  3 
  longitudinal 
  pigmented 
  bands, 
  median 
  one 
  con- 
  

   tinuous 
  throughout 
  most 
  of 
  body, 
  lateral 
  ones 
  along 
  bases 
  of 
  dorsal 
  cirri 
  

   in 
  anterior 
  unmodified 
  region; 
  with 
  epaulettes 
  on 
  tentacular 
  segment 
  and 
  

   part 
  of 
  first 
  setiger 
  A. 
  prisxnaticus 
  

  

  Autolytus 
  alexandri 
  Malmgren, 
  1867 
  

  

  Autolytus 
  alexandri 
  Malmgren, 
  1867, 
  p. 
  37, 
  pi. 
  7, 
  fig. 
  39. 
  — 
  Verrill, 
  1881, 
  p. 
  292, 
  

  

  pi. 
  12, 
  fig. 
  8.— 
  Chamberlin, 
  1920, 
  p. 
  12.— 
  Friedrich, 
  1939, 
  p. 
  123.— 
  Hartman, 
  

  

  1942a, 
  p. 
  13; 
  1944a, 
  p. 
  338, 
  pi. 
  13, 
  fig. 
  11 
  (not 
  pi. 
  13, 
  fig. 
  2); 
  1945, 
  p. 
  17, 
  

  

  pi. 
  2, 
  fig. 
  11. 
  

   Stephanosyllis 
  pida 
  Verrill, 
  1874a, 
  pp. 
  43, 
  132, 
  pi. 
  4, 
  fig. 
  6; 
  1874b, 
  pp. 
  361, 
  362, 
  

  

  pi. 
  4, 
  fig. 
  1 
  (not 
  Proceraea 
  picta 
  Ehlers, 
  1864). 
  

   Stephanosyllis 
  ornata 
  Verrill, 
  1874a, 
  p. 
  132 
  (not 
  Proceraea 
  ornata 
  Verrill, 
  1873). 
  

   Proceraea 
  (Stephanosyllis) 
  ornata 
  Webster 
  and 
  Benedict, 
  1887, 
  p. 
  724 
  (not 
  

  

  Proceraea 
  ornata 
  Verrill, 
  1873). 
  

   Autolytus 
  verrilli 
  Marenzeller, 
  1892, 
  p. 
  416, 
  pi. 
  19, 
  fig. 
  4. 
  — 
  Augener, 
  1928, 
  p. 
  726. 
  — 
  

  

  Wesenberg-Lund, 
  1947, 
  p. 
  33, 
  figs. 
  14, 
  15; 
  1950a, 
  p. 
  18; 
  1950b, 
  p. 
  52; 
  1951, 
  

  

  p. 
  52. 
  

  

  Description. 
  — 
  Stem 
  form: 
  Length 
  4-12 
  mm., 
  width 
  without 
  setae 
  

   0.6-0.8 
  mm., 
  up 
  to 
  35-64 
  segments. 
  Antennae 
  rather 
  short, 
  thick, 
  

   subequal 
  or 
  median 
  one 
  up 
  to 
  twice 
  the 
  length 
  of 
  the 
  lateral; 
  tentac- 
  

   ular 
  cirri 
  equal 
  to 
  or 
  shorter 
  than 
  antennae, 
  upper 
  pair 
  longer; 
  

   first 
  pair 
  dorsal 
  cirri 
  as 
  long 
  as 
  or 
  longer 
  than 
  median 
  antenna; 
  rest 
  

   of 
  dorsal 
  cirri 
  rather 
  irregular, 
  unequal, 
  at 
  least 
  some 
  longer 
  than 
  body 
  

   width, 
  with 
  cirrophores 
  prominent. 
  Distinct 
  epaulettes 
  on 
  first 
  two 
  

   setigerous 
  segments 
  (or 
  to 
  end 
  of 
  setiger 
  4 
  — 
  Hartman, 
  1945). 
  None 
  

   showed 
  sexual 
  bud 
  formation 
  (sexual 
  bud 
  is 
  formed 
  between 
  segments 
  

   25 
  and 
  26 
  — 
  Hartman, 
  1945). 
  Color: 
  In 
  alcohol: 
  Colorless 
  or 
  trans- 
  

   versely 
  banded 
  with 
  reddish 
  to 
  brownish 
  granules, 
  may 
  be 
  two 
  bands 
  

   per 
  segment. 
  

  

  Female 
  stolon 
  (Sacconereis) 
  : 
  A 
  single 
  specimen 
  of 
  72 
  setigers, 
  

   16 
  mm. 
  long, 
  1.2 
  mm. 
  wide 
  without 
  setae, 
  3.5 
  mm. 
  wide 
  with 
  swimming 
  

   setae, 
  consisting 
  of 
  14 
  anterior, 
  26 
  middle, 
  and 
  32 
  posterior 
  setigers. 
  

   Prostomium 
  rounded, 
  with 
  four 
  large 
  dorsal 
  eyes, 
  three 
  antennae 
  

   rather 
  short, 
  subequal; 
  two 
  pairs 
  tentacular 
  cirri 
  of 
  nearly 
  same 
  

   length 
  as 
  antennae; 
  dorsal 
  cirri 
  of 
  anterior 
  part 
  of 
  unequal 
  length 
  but 
  

   all 
  much 
  longer 
  than 
  body 
  width. 
  Thick 
  epaulettes 
  extending 
  on 
  

   first 
  three 
  setigers. 
  The 
  stolon, 
  with 
  swimming 
  setae 
  and 
  fiUed 
  with 
  

  

  