﻿736 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [30] 
  

  

  aud 
  seems 
  to 
  be 
  prolonged 
  inward, 
  as 
  a 
  low 
  ridge, 
  to 
  the 
  outer 
  base 
  of 
  

   the 
  dorsal 
  rami. 
  

  

  There 
  are 
  four 
  pairs 
  of 
  anal 
  cirri, 
  of 
  which 
  three 
  pairs 
  are 
  lateral, 
  

   delicate, 
  as 
  long 
  as 
  five 
  or 
  six 
  of 
  tbe 
  last 
  segments; 
  one 
  pair 
  latero- 
  

   ventral, 
  stout, 
  one-half 
  as 
  long 
  as 
  the 
  lateral 
  cirri. 
  

  

  Body 
  widest 
  in 
  front, 
  tapering 
  gradually 
  but 
  uniformly. 
  

  

  Body 
  white 
  or 
  colorless, 
  lateral 
  membrane 
  white, 
  branchiae 
  with 
  red 
  

   center. 
  

  

  Length 
  of 
  largest 
  specimen, 
  25 
  mm 
  ; 
  width 
  of 
  largest 
  specimen, 
  0.8'"'". 
  

   Bare 
  ; 
  sandy 
  bottom, 
  G-8 
  fathoms. 
  

  

  SPIO 
  (Fabricius) 
  (Ersted. 
  

  

  Spio 
  filicornis 
  Fabricius. 
  

  

  Nereis 
  filicornis 
  Fabbicitjs. 
  Fauna 
  Gronl., 
  p. 
  307. 
  1780. 
  

  

  Spio 
  filicornis 
  Fabricius. 
  Schr. 
  Nattirf. 
  Freunde 
  Berlin, 
  vi, 
  p. 
  284, 
  pi. 
  v, 
  figs. 
  8-12 
  

  

  (teste 
  Malmgren). 
  

   Spio 
  filicornis 
  Malmgren. 
  AnnulataPolych., 
  p. 
  91, 
  pi. 
  i, 
  fig. 
  1. 
  1867. 
  

  

  A 
  form 
  common 
  atEastport 
  seems 
  certainly 
  to 
  agree 
  with 
  the 
  species 
  

   regarded 
  by 
  Malmgren 
  as 
  identical 
  with 
  the 
  8. 
  filicornis 
  of 
  Fabricius. 
  

   The 
  specimens 
  show 
  considerable 
  diversity 
  of 
  coloring. 
  Young 
  forms 
  

   have 
  the 
  body 
  colorless, 
  with 
  two 
  brown 
  spots 
  on 
  each 
  segment, 
  aud 
  

   numerous 
  flake-white 
  markings, 
  also 
  two 
  brown 
  spots, 
  anterior 
  and 
  pos- 
  

   terior, 
  at 
  the 
  base 
  of 
  each 
  dorsal 
  ramus; 
  tentacular 
  cirri 
  colorless, 
  with 
  

   a 
  few 
  brown 
  rings, 
  and 
  numerous 
  specks 
  and 
  irregular 
  lines 
  of 
  flake- 
  

   white. 
  Other 
  young 
  forms 
  had 
  these 
  cirri 
  very 
  dark 
  brown, 
  almost 
  

   black 
  throughout 
  ; 
  or, 
  again, 
  the 
  cirri 
  may 
  be 
  brown 
  above, 
  colorless 
  

   below, 
  without 
  transverse 
  bands. 
  

  

  Some 
  larger 
  specimens, 
  not 
  full-grown, 
  were 
  entirely 
  without 
  mark- 
  

   ings. 
  Adult 
  forms 
  were 
  light 
  green 
  ; 
  tentacular 
  cirri 
  green, 
  with 
  bands 
  

   of 
  white 
  and 
  chestnut 
  ; 
  or, 
  tentacular 
  cirri 
  colorless 
  above, 
  green 
  be- 
  

   low, 
  with 
  brown 
  bands. 
  Others 
  had 
  umber-brown 
  tentacular 
  cirri, 
  and 
  

   on 
  each 
  segment 
  two 
  brown 
  spots, 
  one 
  in 
  front 
  of, 
  the 
  other 
  above 
  

   (within) 
  each 
  dorsal 
  ramus. 
  

  

  Branchiae 
  green 
  or 
  brown 
  with 
  red 
  center 
  ; 
  sometimes 
  with 
  flake- 
  

   white 
  spots. 
  Common; 
  sand 
  and 
  gravel; 
  low 
  water 
  to 
  10 
  fathoms. 
  

  

  Spio 
  Bathbuni 
  Webster 
  & 
  Benedict. 
  

  

  Annelida 
  Cb;etopoda 
  of 
  Provincetown, 
  

  

  Common 
  in 
  sand 
  and 
  sandy 
  mud, 
  at 
  low 
  water. 
  

  

  STBEBLOSPIO 
  Webster. 
  

   Streblospio 
  Benedicti 
  Webster. 
  

  

  Annelida 
  Chretopoda 
  of 
  New 
  Jersey, 
  p. 
  20, 
  pi. 
  v, 
  figs. 
  48-r>0. 
  Also, 
  Annelida 
  Chrcto- 
  

   poda 
  of 
  Provincetown. 
  (Webster 
  and 
  Benedict.) 
  

   One 
  specimen 
  was 
  found 
  with 
  eggs. 
  They 
  are 
  dorsal, 
  lateral, 
  two 
  to 
  

   each 
  segment. 
  They 
  are 
  covered 
  by 
  a 
  membrane, 
  which 
  is 
  continued 
  

  

  