﻿Gatty 
  Marine 
  Laboratory, 
  St. 
  Andrews. 
  165 
  

  

  smooth. 
  At 
  one 
  point 
  the 
  tube 
  had 
  been 
  broken 
  and 
  

   repaired, 
  but 
  an 
  angle 
  on 
  each 
  side 
  indicates 
  the 
  union. 
  

   The 
  tube 
  had 
  also 
  been 
  fractured 
  in 
  capture, 
  and 
  the 
  annelid 
  

   had 
  doubled 
  itself 
  into 
  the 
  largest 
  fragment 
  — 
  the 
  head 
  and 
  

   tentacles 
  being 
  completely 
  protected, 
  but 
  the 
  tip 
  of 
  the 
  tail 
  

   protruded. 
  

  

  This 
  form 
  has 
  certain 
  resemblances 
  to 
  the 
  Heterocirrus 
  

   caput 
  esocis 
  of 
  De 
  St. 
  Joseph, 
  but 
  the 
  absence 
  of 
  eyes 
  and 
  

   the 
  structure 
  of 
  the 
  anus 
  and 
  of 
  the 
  hooks 
  indicate 
  

   divergences. 
  

  

  Chcetozone 
  A. 
  

  

  A 
  fragmentary 
  form 
  without 
  snout 
  or 
  terminal 
  region 
  was 
  

   dredged 
  on 
  the 
  3rd 
  September, 
  in 
  the 
  ' 
  Porcupine 
  ' 
  Expedition 
  

   of 
  1870, 
  in 
  the 
  Bay 
  of 
  Tunis. 
  In 
  all 
  probability 
  it 
  adhered 
  

   to 
  the 
  " 
  tangles," 
  which 
  the 
  naturalists 
  then 
  used, 
  after 
  the 
  

   time-honoured 
  practice 
  of 
  the 
  coral- 
  fishermen 
  of 
  the 
  Medi- 
  

   terranean. 
  The 
  absence 
  of 
  the 
  head 
  and 
  posterior 
  region 
  

   renders 
  diagnosis 
  and 
  description 
  imperfect, 
  but 
  externally 
  

   it 
  differs 
  in 
  certain 
  respects 
  from 
  the 
  northern 
  Chcetozone 
  

   setosa. 
  Thus 
  the 
  body 
  is 
  more 
  rounded, 
  presents 
  no 
  dorsal 
  

   groove 
  in 
  the 
  preparation, 
  and 
  the 
  ventral 
  groove 
  is 
  slightly 
  

   marked, 
  whereas 
  both 
  are 
  usually 
  distinct 
  in 
  C. 
  setosa. 
  The 
  

   lateral 
  bristles 
  are 
  much 
  shorter, 
  and 
  though 
  the 
  specimen 
  

   is 
  a 
  small 
  one, 
  the 
  basal 
  deep 
  brown 
  hue 
  and 
  the 
  great 
  

   breadth 
  of 
  the 
  yellow 
  tips, 
  as 
  at 
  the 
  tenth 
  foot 
  (for 
  so 
  all 
  is 
  

   termed 
  beyond 
  the 
  bend 
  at 
  the 
  end 
  of 
  the 
  shaft), 
  are 
  diagnostic 
  

   (PI. 
  VI. 
  fig. 
  4). 
  The 
  broad 
  terminal 
  blade 
  tapers 
  to 
  a 
  

   long 
  and 
  fine 
  point 
  which 
  is 
  usually 
  curved. 
  Moreover, 
  

   whilst 
  they 
  are 
  somewhat 
  brittle, 
  they 
  do 
  not 
  exhibit 
  that 
  

   proneness 
  to 
  split 
  from 
  the 
  edge 
  downward 
  and 
  backward 
  as 
  

   commonly 
  seen 
  in 
  C. 
  setosa. 
  Accompanying 
  the 
  foregoing 
  are 
  

   a 
  few 
  narrow 
  forms 
  (PI. 
  VI. 
  fig. 
  4 
  a). 
  Although 
  proportion- 
  

   ally 
  the 
  crotchets 
  should 
  have 
  been 
  present 
  in 
  the 
  portion 
  

   of 
  the 
  posterior 
  region 
  attached, 
  only 
  bristles 
  exist. 
  The 
  

   inserted 
  basal 
  region 
  or 
  shaft 
  of 
  the 
  bristle 
  is 
  deep 
  brown, 
  

   curved 
  and 
  dilated 
  from 
  the 
  somewhat 
  narrow 
  end 
  upward, 
  

   and 
  is 
  striated. 
  

  

  Two 
  fragments 
  of 
  the 
  anterior 
  region 
  of 
  a 
  Chcetozone 
  

   which 
  does 
  not 
  appear 
  to 
  differ 
  from 
  C. 
  setosa, 
  Malmgren, 
  were 
  

   procured 
  probably 
  by 
  the 
  tangles 
  in 
  Bono 
  Bay, 
  on 
  the 
  coast 
  

   of 
  Algiers, 
  in 
  the 
  ' 
  Porcupine'' 
  Expedition 
  of 
  1870. 
  As 
  no 
  

   crotchets 
  are 
  present, 
  a 
  certain 
  amount 
  of 
  doubt 
  remains, 
  

   especially 
  as 
  the 
  bristles 
  at 
  the 
  end 
  of 
  one 
  fragment 
  are 
  

  

  