﻿168 
  Prof. 
  M'Intosh's 
  Notes 
  from 
  the 
  

  

  The 
  body 
  is 
  filiform 
  and 
  elongated, 
  probably 
  2-3 
  inches 
  

   in 
  length, 
  apparently 
  tubicolous, 
  and 
  it 
  is 
  imperfect 
  pos- 
  

   teriorly 
  ; 
  but 
  at 
  least 
  two 
  regions 
  are 
  recognizable 
  — 
  namely, 
  

   the 
  anterior 
  with 
  nine 
  pairs 
  of 
  well-marked 
  pale 
  golden 
  

   bristles, 
  and 
  the 
  succeeding 
  division. 
  

  

  The 
  first 
  region 
  agrees 
  with 
  the 
  Chaetopterids 
  in 
  the 
  

   number 
  of 
  the 
  segments 
  (nine), 
  and 
  each 
  foot 
  has 
  a 
  dorsal 
  

   and 
  a 
  ventral 
  tuft 
  of 
  moderately 
  long 
  capillary, 
  pale 
  golden 
  

   bristles 
  (PI. 
  VII. 
  fig. 
  7 
  a) 
  which 
  have 
  a 
  slight 
  convergent 
  

   curve 
  — 
  that 
  is, 
  the 
  dorsal 
  bending 
  downward 
  and 
  the 
  ventral 
  

   upward. 
  Both 
  arise 
  close 
  together 
  in 
  the 
  tissues, 
  then 
  slant 
  

   from 
  each 
  other 
  so 
  that 
  a 
  flat 
  cone 
  in 
  the 
  middle 
  of 
  the 
  foot 
  

   lies 
  between 
  them. 
  The 
  dorsal 
  tuft 
  is 
  considerably 
  longer 
  

   than 
  the 
  ventral, 
  but 
  the 
  structure 
  of 
  the 
  bristles 
  is 
  the 
  same 
  

   in 
  both. 
  Each 
  bristle 
  has 
  a 
  long 
  cylindrical 
  shaft 
  not 
  

   differentiated 
  from 
  the 
  tip, 
  and 
  gradually 
  tapering 
  to 
  a 
  fine 
  

   point 
  from 
  its 
  middle, 
  though 
  in 
  the 
  shorter 
  ventral 
  forms 
  

   there 
  are 
  differences 
  in 
  this 
  respect. 
  

  

  No 
  special 
  differentiation 
  separates 
  the 
  first 
  region 
  of 
  the 
  

   body 
  from 
  that 
  which 
  follows, 
  and 
  therein 
  it 
  differs 
  from 
  

   the 
  Chaetopterids 
  ; 
  but 
  the 
  first 
  segment 
  of 
  the 
  succeeding 
  

   region 
  is 
  three 
  times 
  broader 
  (antero-posteriorly) 
  than 
  those 
  

   in 
  front, 
  and 
  its 
  bristles 
  are 
  shorter 
  and 
  structurally 
  different, 
  

   whilst 
  each 
  of 
  the 
  two 
  divisions 
  carries 
  a 
  continuous 
  row 
  of 
  

   stout 
  curved 
  crotchets 
  without 
  the 
  differentiation 
  between 
  

   shaft 
  and 
  tip 
  as 
  observed 
  in 
  Chcetozone 
  (PL 
  VII. 
  fig. 
  7 
  b 
  

   representing 
  one 
  from 
  the 
  tenth 
  foot). 
  Dorsally 
  are 
  two 
  

   smooth 
  capillary 
  bristles, 
  followed 
  by 
  five 
  or 
  six 
  crotchets 
  

   with 
  the 
  tips 
  produced 
  into 
  slender 
  processes, 
  and 
  then 
  a 
  

   series 
  of 
  the 
  stout 
  curved 
  crotchets 
  with 
  slightly 
  tapered 
  tips 
  

   ending 
  in 
  a 
  stout 
  though 
  more 
  or 
  less 
  pointed 
  tip. 
  The 
  

   arrangement 
  of 
  these 
  crotchets 
  recalls 
  the 
  condition 
  in 
  

   Chcetozone 
  setosa, 
  bristles 
  being 
  also 
  interposed 
  between 
  the 
  

   crotchets 
  in 
  the 
  rows. 
  

  

  5. 
  On 
  the 
  Cirratulidse 
  dredged 
  in 
  the 
  Gulf 
  of 
  St. 
  Lawrence, 
  

  

  Canada, 
  by 
  Dr. 
  Whiteaves. 
  

   Chcetozone 
  I. 
  

  

  A 
  fragment 
  of 
  a 
  Chcetozone 
  (?), 
  apparently 
  the 
  posterior 
  end 
  

   of 
  a 
  large 
  form, 
  was 
  dredged 
  at 
  Station 
  A. 
  6, 
  1872, 
  by 
  

   Dr. 
  Whiteaves. 
  The 
  total 
  length 
  is 
  about 
  an 
  inch 
  and 
  a 
  

   quarter. 
  The 
  segments 
  are 
  distinct 
  though 
  narrow 
  through- 
  

   out, 
  and 
  the 
  body 
  is 
  somewhat 
  dilated 
  in 
  front 
  of 
  the 
  tail, 
  

   and 
  then 
  gently 
  tapers 
  to 
  the 
  terminal 
  anus, 
  below 
  which 
  a 
  

   process 
  with 
  a 
  median 
  groove 
  projects 
  posteriorly. 
  The 
  

  

  