﻿170 
  Prof. 
  M'lntosh's 
  Notes 
  from 
  the 
  

  

  6. 
  On 
  the 
  Cirratulidse 
  dredged 
  in 
  Norway 
  by 
  

   Canon 
  Norman, 
  D.C.L., 
  F.R.S. 
  

  

  The 
  northern 
  form, 
  Chcetozone 
  setosa, 
  was 
  first 
  found 
  in 
  

   Finmark 
  by 
  Malmgren 
  and 
  in 
  Sweden 
  by 
  Loven, 
  and 
  it 
  is 
  

   abundant 
  in 
  the 
  Fjords 
  of 
  Norway, 
  where 
  it 
  was 
  dredged 
  

   by 
  Canon 
  Norman. 
  The 
  head 
  is 
  acutely 
  pointed 
  and 
  some- 
  

   what 
  triangular, 
  with 
  the 
  mouth 
  on 
  the 
  ventral 
  surface 
  a 
  

   short 
  distance 
  from 
  the 
  tip. 
  The 
  body 
  is 
  about 
  an 
  inch 
  in 
  

   length, 
  elongate-fusiform, 
  tapering 
  a 
  little 
  anteriorly 
  and 
  

   more 
  gradually 
  and 
  distinctly 
  posteriorly, 
  where 
  it 
  terminates 
  

   in 
  a 
  pointed 
  extremity 
  with 
  the 
  anus 
  at 
  the 
  tip, 
  which 
  varies 
  

   in 
  acuteness 
  according 
  to 
  the 
  condition 
  of 
  regeneration, 
  

   some 
  being 
  rather 
  blunt 
  after 
  recent 
  loss 
  of 
  segments. 
  The 
  

   thickest 
  part 
  of 
  the 
  body 
  is 
  about 
  the 
  end 
  of 
  the 
  anterior 
  

   third. 
  It 
  is 
  more 
  or 
  less 
  rounded 
  throughout, 
  with 
  a 
  

   tendency, 
  however, 
  to 
  dorsal 
  and 
  ventral 
  flattening. 
  The 
  

   segments 
  number 
  70-90, 
  and 
  are 
  narrow 
  in 
  front, 
  but 
  more 
  

   evident 
  posteriorly 
  from 
  the 
  increased 
  antero-posterior 
  

   diameter. 
  The 
  surface 
  is 
  greyish 
  in 
  the 
  preparations 
  and 
  is 
  

   iridescent. 
  

  

  The 
  long 
  tentacles 
  arise 
  on 
  the 
  dorso-lateral 
  region 
  

   immediately 
  behind 
  the 
  head, 
  and 
  seem 
  to 
  be 
  rarely 
  present 
  

   in 
  examples 
  caught 
  by 
  the 
  dredge. 
  They 
  have 
  the 
  ventral 
  

   and 
  probably 
  ciliated 
  groove 
  of 
  other 
  forms. 
  

  

  The 
  branchiae 
  occur 
  in 
  pairs, 
  one 
  on 
  each 
  side, 
  probably 
  

   from 
  fourteen 
  to 
  twenty 
  in 
  succession, 
  and 
  then 
  at 
  intervals 
  

   to 
  the 
  posterior 
  third. 
  They 
  are 
  slender 
  filaments, 
  those 
  in 
  

   front 
  being 
  long 
  and 
  sinuous. 
  The 
  first 
  bristled 
  foot 
  occurs 
  

   behind 
  the 
  tentacles 
  and 
  has 
  a 
  dorsal 
  and 
  a 
  ventral 
  tuft 
  of 
  

   pale 
  golden 
  capillary 
  bristles,with 
  a 
  cylindrical 
  shaft 
  generally 
  

   imbedded 
  in 
  the 
  tissues, 
  and 
  a 
  broader 
  flattened 
  serrated 
  tip 
  

   which 
  tapers 
  to 
  a 
  fine 
  point. 
  Little 
  difference 
  exists 
  in 
  the 
  

   anterior 
  region 
  between 
  the 
  lengths 
  of 
  the 
  dorsal 
  and 
  the 
  

   ventral 
  bristles, 
  but 
  after 
  the 
  twentieth, 
  or 
  thereabout, 
  the 
  

   dorsal 
  elongate 
  to 
  about 
  the 
  diameter 
  of 
  the 
  body, 
  forming 
  

   glistening 
  tufts 
  usually 
  carried 
  transversely 
  in 
  the 
  pre- 
  

   parations. 
  Toward 
  the 
  posterior 
  region 
  stout, 
  short, 
  

   crotchet-like 
  forms 
  appear 
  amongst 
  the 
  long 
  bristles 
  in 
  

   the 
  ventral 
  and 
  then 
  in 
  the 
  dorsal 
  division. 
  They 
  are 
  more 
  

   slender 
  in 
  the 
  dorsal 
  than 
  in 
  the 
  ventral, 
  and 
  the 
  dorsal 
  

   bristles 
  are 
  fewer 
  in 
  number 
  and 
  more 
  attenuate, 
  only 
  a 
  brief 
  

   flattened 
  part 
  occurring 
  beyond 
  the 
  skin, 
  the 
  rest 
  being 
  hair- 
  

   like. 
  Moreover, 
  the 
  ventral 
  bristles 
  present 
  intermediate 
  

   forms, 
  the 
  shafts 
  being 
  three 
  times 
  the 
  diameter 
  of 
  the 
  ordinary 
  

  

  