﻿MARESTE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  253 
  

  

  Syllis 
  (Ehlersia) 
  cornuta 
  Rathke, 
  1843 
  

  

  Figure 
  28, 
  f 
  

  

  Syllis 
  (Ehlersia) 
  cornuta 
  Rathke, 
  1843, 
  p. 
  164, 
  pi. 
  7, 
  fig. 
  12. 
  — 
  Malmgren, 
  1867, 
  

  

  p. 
  43, 
  pi. 
  7, 
  fig. 
  45.— 
  Southern, 
  1914, 
  p. 
  37.— 
  Fauvel, 
  1923, 
  p. 
  267, 
  fig. 
  100, 
  

  

  g-i.— 
  Augener, 
  1928, 
  p. 
  718.— 
  Monro, 
  1933, 
  p. 
  34; 
  1937, 
  p. 
  273; 
  1939b, 
  p. 
  

  

  387.— 
  Wesenberg-Lund, 
  1947, 
  p. 
  6; 
  1950a, 
  p. 
  15; 
  1950b, 
  p. 
  46; 
  1951, 
  p. 
  36.— 
  

  

  Zatsepin, 
  1948, 
  p. 
  115, 
  pi. 
  31, 
  fig. 
  4. 
  

   Chaetosyllis 
  oerstedi 
  Malmgren, 
  1867, 
  p. 
  45, 
  pi. 
  8, 
  fig. 
  51 
  (epitokous 
  form). 
  

   Syllis 
  oerstedi 
  Th6el, 
  1879, 
  p. 
  40, 
  pi. 
  2, 
  fig. 
  33; 
  pi. 
  3, 
  figs. 
  34, 
  35.— 
  Annenkova, 
  

  

  1938, 
  p. 
  150.— 
  Gorbunov, 
  1946, 
  p. 
  38. 
  

   Syllis 
  quaternaria 
  Moore, 
  1906a, 
  p. 
  352, 
  fig. 
  (epitokous 
  form). 
  

   Syllis 
  alternata 
  Moore, 
  1908, 
  p. 
  321, 
  fig. 
  (p. 
  324); 
  1909a, 
  p. 
  321. 
  — 
  Annenkova, 
  

  

  1938, 
  p. 
  148.— 
  Rioia, 
  1941, 
  p. 
  691, 
  pi. 
  3, 
  figs. 
  1-9.— 
  Berkeley 
  and 
  Berkeley, 
  

  

  1948, 
  p. 
  77, 
  fig. 
  115. 
  

   Syllis 
  (Ehlersia) 
  heterochaeta 
  Moore, 
  1909a, 
  p. 
  322, 
  pi. 
  15, 
  figs. 
  1-4. 
  — 
  Annenkova, 
  

  

  1938, 
  p. 
  148.— 
  Rioja, 
  1941, 
  p. 
  694, 
  pi. 
  4, 
  figs. 
  7-10; 
  Berkeley 
  and 
  Berkeley, 
  

  

  1948, 
  p. 
  76, 
  fig. 
  113. 
  

   Ehlersia 
  cornuta 
  Hartman, 
  1945, 
  p. 
  15. 
  

   Typosyllis 
  alternata 
  Hartman, 
  1948, 
  p. 
  21. 
  

  

  Description. 
  — 
  Stem 
  form: 
  Length 
  9-45 
  mm., 
  width 
  without 
  setae 
  

   1-1.2 
  mm. 
  Segments 
  very 
  short. 
  Prostomium 
  with 
  two 
  pairs 
  of 
  eyes, 
  

   anterior 
  pair 
  larger, 
  crescentric, 
  with 
  or 
  without 
  pair 
  of 
  small 
  ocular 
  

   spots 
  anterior 
  to 
  lateral 
  antennae. 
  Moniliform 
  dorsal 
  cirri 
  with 
  about 
  

   14-22 
  articles 
  (11-40). 
  Neurosetae 
  all 
  compound, 
  with 
  longer 
  and 
  

   shorter 
  blades, 
  the 
  longer 
  ones 
  2-4 
  times 
  longer 
  than 
  the 
  shorter 
  ones, 
  

   with 
  jfine 
  marginal 
  fringe 
  extending 
  to 
  near 
  the 
  tips 
  (may 
  give 
  appear- 
  

   ance 
  of 
  having 
  a 
  bidentate 
  tip 
  with 
  a 
  subterminal 
  tooth) 
  ; 
  tips 
  of 
  short 
  

   blades 
  slightly 
  hooked; 
  tips 
  of 
  long, 
  thin 
  blades 
  slightly 
  hooked 
  or 
  

   with 
  a 
  slight 
  knob 
  (worn 
  down?). 
  In 
  posterior 
  segments, 
  terminal 
  

   blades 
  of 
  neurosetae 
  not 
  as 
  long 
  as 
  in 
  anterior 
  segments. 
  One 
  speci- 
  

   men 
  with 
  developing 
  stolon 
  of 
  41 
  segments 
  beginning 
  on 
  segment 
  

   75 
  of 
  stem 
  form. 
  Color: 
  In 
  alcohol: 
  (1) 
  anterior 
  segments 
  dusky, 
  

   then 
  two 
  narrow, 
  reddish 
  brown, 
  transverse 
  bands 
  per 
  segment 
  on 
  

   anterior 
  and 
  middle 
  part 
  of 
  each 
  segment; 
  (2) 
  rusty 
  brown, 
  with 
  two 
  

   darker 
  bands 
  per 
  segment 
  on 
  part 
  of 
  body; 
  (3) 
  colorless. 
  

  

  Male 
  and 
  female 
  stolons 
  (Chaetosyllis) 
  : 
  Length 
  8-19 
  mm., 
  width 
  

   without 
  setae 
  1-1.2 
  mm., 
  width 
  including 
  setae 
  4-5 
  mm., 
  segments 
  

   30-70 
  (1 
  unmodified 
  anterior 
  segment, 
  24-62 
  modified 
  segments 
  with 
  

   swimming 
  setae, 
  0-7 
  unmodified 
  posterior 
  segments); 
  dorsal 
  cirri 
  

   alternately 
  longer 
  and 
  shorter, 
  with 
  11-18 
  articles 
  (14-25 
  — 
  Moore, 
  

   1906); 
  capillary 
  setae 
  much 
  longer 
  than 
  the 
  dorsal 
  cirri; 
  neurosetae 
  as 
  

   in 
  posterior 
  segments 
  of 
  stem 
  form 
  (distal 
  blades 
  not 
  as 
  long 
  as 
  in 
  

   anterior 
  region 
  of 
  stem 
  form) 
  ; 
  some 
  segments 
  showed 
  the 
  characteristic 
  

   banding 
  of 
  two 
  narrow 
  bands 
  per 
  segment. 
  

  

  