﻿250 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  ? 
  Autolytus 
  longisetosus 
  Malmgren, 
  1867, 
  p. 
  34, 
  pi. 
  7, 
  fig. 
  38. 
  — 
  Verrill, 
  1881, 
  p. 
  

  

  292, 
  pi. 
  12, 
  fig. 
  10.— 
  Moore, 
  1902, 
  p. 
  274; 
  1909b, 
  p. 
  134. 
  

   Autolytus 
  incertus 
  Malmgren, 
  1867, 
  p. 
  35, 
  pi. 
  6, 
  fig. 
  40. 
  

   Proceraea 
  gracilis 
  Verrill, 
  1874a, 
  pp. 
  43, 
  132, 
  pi. 
  5, 
  fig. 
  1; 
  1874b, 
  pp. 
  361, 
  362, 
  

  

  370, 
  379, 
  pi. 
  3, 
  fig. 
  2.— 
  Webster 
  and 
  Benedict, 
  1887, 
  p. 
  723. 
  

   Autolytus 
  prismaticus 
  Marenzeller, 
  1892, 
  p. 
  420. 
  — 
  Chamberlin, 
  1920, 
  p. 
  12. 
  — 
  

  

  Augener, 
  1928, 
  p. 
  725.— 
  Annenkova, 
  1934, 
  p. 
  322; 
  1938, 
  p. 
  156.— 
  Not 
  

  

  Berkeley 
  and 
  Berkeley, 
  1938, 
  p. 
  48; 
  1948, 
  p. 
  68.— 
  Gorbunov, 
  1946, 
  p. 
  38.— 
  

  

  Wesenberg-Lund, 
  1947, 
  p. 
  24, 
  figs. 
  10-12 
  (part). 
  — 
  ? 
  Hartman 
  and 
  Reish, 
  

  

  1950, 
  p. 
  13. 
  

   Autolytus 
  trilineatv^ 
  Berkeley 
  and 
  Berkeley, 
  1945, 
  p. 
  318, 
  fig. 
  1, 
  a-b; 
  1948, 
  p. 
  

  

  69, 
  fig. 
  100. 
  

  

  Description.- 
  — 
  ^Stem 
  form: 
  Length 
  5-24 
  mm., 
  mdth 
  without 
  setae 
  

   0.7-1 
  mm., 
  up 
  to 
  52-92 
  segments. 
  Proportion 
  of 
  anterior 
  appendages 
  

   and 
  dorsal 
  cirri 
  similar 
  to 
  A. 
  fallax. 
  Distinct 
  epaulettes 
  on 
  tentacular 
  

   segment 
  and 
  usually 
  extending 
  also 
  on 
  at 
  least 
  part 
  of 
  first 
  setigerous 
  

   segment. 
  Of 
  7 
  specimens, 
  2 
  were 
  without 
  signs 
  of 
  bud 
  formation, 
  

   although 
  the 
  body 
  was 
  constricted 
  more 
  than 
  normally 
  between 
  

   setigers 
  13 
  and 
  14; 
  4 
  showed 
  sexual 
  bud 
  formation 
  with 
  the 
  head 
  

   developing 
  between 
  setigers 
  13 
  and 
  14; 
  and 
  1 
  had 
  13 
  setigers 
  mth 
  a 
  

   newly 
  regenerating 
  posterior 
  end. 
  Color: 
  In 
  alcohol: 
  Creamy 
  white 
  

   with 
  three 
  conspicuous, 
  longitudinal, 
  black 
  or 
  dark 
  bands, 
  the 
  median 
  

   one 
  broader, 
  less 
  dense, 
  continuous 
  throughout 
  body, 
  the 
  dorsolateral 
  

   ones 
  narrower, 
  darker, 
  at 
  level 
  of 
  bases 
  of 
  dorsal 
  cirri, 
  often 
  confined 
  

   to 
  anterior 
  fourth 
  or 
  half 
  of 
  body. 
  

  

  Female 
  stolon 
  (Sacconereis) 
  : 
  A 
  specimen 
  of 
  58 
  setigers, 
  9 
  mm. 
  long, 
  

   1 
  mm. 
  wide 
  without 
  setae, 
  3 
  mm. 
  wide 
  with 
  swimming 
  setae, 
  with 
  

   body 
  regions 
  of 
  6 
  anterior, 
  18 
  middle, 
  and 
  34 
  posterior 
  setigers. 
  

   Epaulettes 
  somewhat 
  triangular, 
  extending 
  on 
  tentacular 
  and 
  first 
  

   setigerous 
  segments. 
  Otherwise 
  SiS 
  in 
  A. 
  fallax. 
  Color: 
  In 
  alcohol: 
  

   Shows 
  the 
  same 
  characteristic 
  pigmentation 
  as 
  the 
  stem 
  form, 
  three 
  

   longitudinal, 
  black 
  pigmented 
  bands. 
  Two 
  female 
  stolons 
  with 
  

   swimming 
  setae 
  and 
  eggs 
  massed 
  inside 
  body 
  dredged 
  in 
  5 
  and 
  6 
  

   fathoms 
  August 
  6, 
  30, 
  1948. 
  Male 
  stolons 
  {Polyhosirichus) 
  : 
  no 
  

   specimens 
  taken. 
  

  

  Remarks. 
  — 
  Polyhosirichus 
  longosetosus 
  Oersted, 
  the 
  male 
  stolon 
  

   (this 
  might 
  well 
  be 
  the 
  male 
  stolon 
  of 
  A. 
  fallax, 
  see 
  systematic 
  dis- 
  

   cussion 
  above), 
  Autolytus 
  incertus 
  Malmgren, 
  the 
  female 
  stolon, 
  and 
  

   Proceraea 
  gracilis 
  Verrill, 
  the 
  stem 
  form, 
  have 
  been 
  referred 
  previously 
  

   by 
  Marenzeller 
  (1892) 
  to 
  A. 
  prismaticus. 
  A. 
  trilineatus 
  Berkeley 
  and 
  

   Berkeley 
  is 
  herein 
  referred 
  to 
  A. 
  prismaticus] 
  the 
  description, 
  including 
  

   the 
  characteristic 
  three 
  longitudinal 
  bands, 
  is 
  in 
  agreement. 
  The 
  

   record 
  of 
  A. 
  prismaticus 
  by 
  the 
  Berkeleys 
  (1938, 
  1948) 
  is 
  doubted 
  

   since 
  the 
  stem 
  form 
  agrees 
  with 
  A. 
  cornutus 
  or 
  A. 
  prolifer 
  but 
  not 
  A. 
  

   prismaticus; 
  the 
  sexual 
  forms 
  agree 
  with 
  A. 
  cornutus 
  or 
  A. 
  prismaticus 
  

   in 
  the 
  number 
  of 
  six 
  anterior 
  unmodified 
  setigers; 
  they 
  agree 
  with 
  A. 
  

  

  