﻿146 
  Prof. 
  M'Intosh's 
  Notes 
  from 
  the 
  

  

  verrilli, 
  sp. 
  n., 
  and 
  careful 
  consideration 
  of 
  the 
  description 
  

   and 
  the 
  figures 
  shows 
  that 
  besides 
  the 
  relationships 
  mentioned 
  

   by 
  the 
  author 
  this 
  minute 
  form 
  presents 
  affinities 
  with 
  other 
  

   types 
  not 
  mentioned 
  by 
  him. 
  

  

  The 
  annelid 
  is 
  minute, 
  viz. 
  2'5 
  to 
  3 
  mm., 
  and 
  its 
  breadth 
  

   is 
  '2 
  to 
  - 
  3 
  mm. 
  The 
  prostoraium 
  is 
  large, 
  subquadrate, 
  with 
  

   rounded 
  corners 
  ; 
  eyes 
  3 
  pairs, 
  reddish 
  brown, 
  the 
  first 
  pair 
  

   evidently 
  less 
  important 
  (as 
  they 
  are 
  rudimentary) 
  than 
  the 
  

   others, 
  which 
  lie 
  behind, 
  in 
  the 
  position 
  usually 
  found 
  in 
  

   Syllids, 
  and, 
  from 
  the 
  figure, 
  the 
  anterior 
  pair 
  of 
  these 
  has 
  

   lenses. 
  The 
  tentacles 
  are 
  short, 
  stout, 
  and 
  clavate, 
  the 
  

   median 
  arising 
  between 
  the 
  middle 
  pair 
  of 
  eyes 
  and 
  the 
  

   lateral 
  near 
  the 
  anterior 
  border 
  of 
  the 
  prostomium. 
  The 
  

   palpi 
  are 
  " 
  small, 
  mammiliform, 
  situated 
  on 
  the 
  ventral 
  face 
  

   of 
  the 
  prostomium 
  and 
  directed 
  downwards," 
  nearly 
  invisible 
  

   from 
  above. 
  They 
  have 
  enlarged 
  bases 
  and 
  short 
  cirriforra 
  

   distal 
  portions. 
  Tentacular 
  cirri 
  of 
  the 
  shape 
  of 
  the 
  ten- 
  

   tacles, 
  but 
  they 
  are 
  supported 
  by 
  short 
  cirrophores. 
  The 
  

   colourless 
  body 
  is 
  slightly 
  depressed, 
  the 
  segments 
  increasing 
  

   a 
  little 
  in 
  width 
  to 
  the 
  middle, 
  the 
  first 
  seven 
  (to 
  the 
  caudal 
  

   end 
  of 
  the 
  gizzard 
  — 
  eighth 
  segment) 
  being 
  short, 
  whilst 
  the 
  

   succeeding 
  are 
  longer 
  and 
  contain 
  the 
  gonads. 
  The 
  proboscis 
  

   occupies 
  the 
  first 
  three 
  segments, 
  is 
  more 
  or 
  less 
  cylindrical, 
  

   with 
  thick 
  brownish 
  chitinous 
  lining, 
  edentulous. 
  The 
  rim 
  

   has 
  a 
  circle 
  of 
  ten 
  soft 
  papillae. 
  The 
  pygidium 
  is 
  small 
  

   and 
  hears 
  a 
  median 
  unjointed 
  ventral 
  style 
  and 
  a 
  pair 
  of 
  very 
  

   long 
  unjointed 
  cirri. 
  The 
  prominent 
  foot 
  is 
  uniramous 
  on 
  

   all 
  the 
  segments 
  in 
  the 
  immature 
  worm 
  and 
  on 
  the 
  first 
  

   seven 
  of 
  the 
  sexually 
  mature. 
  The 
  dorsal 
  cirrus 
  is 
  of 
  the 
  

   same 
  shape 
  and 
  size 
  as 
  the 
  tentacular 
  cirri 
  on 
  the 
  first 
  three 
  

   segments. 
  The 
  succeeding 
  are 
  more 
  slender 
  and 
  tapered, 
  

   with 
  the 
  tip 
  often 
  differentiated 
  as 
  a 
  more 
  slender 
  and 
  subu- 
  

   late 
  process, 
  and 
  they 
  (cirri) 
  increase 
  in 
  length 
  toward 
  the 
  

   middle, 
  again 
  diminishing 
  posteriorly, 
  whilst 
  they 
  also 
  be- 
  

   come 
  distinctly 
  jointed 
  or 
  moniliform, 
  though 
  the 
  author 
  

   adds 
  that 
  there 
  is 
  great 
  difference 
  in 
  this 
  respect, 
  some 
  having 
  

   the 
  cirri 
  much 
  more 
  distinctly 
  moniliform 
  than 
  others, 
  and 
  

   " 
  sometimes 
  there 
  is 
  a 
  slight 
  but 
  distinct 
  alternation 
  of 
  longer 
  

   and 
  shorter 
  cirri 
  ; 
  " 
  but 
  these 
  conditions 
  are 
  not 
  constant. 
  

   The 
  setigerous 
  lobe 
  has 
  a 
  single 
  spine, 
  which 
  ends 
  in 
  a 
  rough 
  

   flattened 
  knob, 
  is 
  compressed 
  and 
  slopes 
  inward 
  from 
  the 
  

   salient 
  dorsal 
  angle. 
  The 
  ventral 
  cirrus 
  leaves 
  the 
  setigerous 
  

   lobe 
  near 
  the 
  tip, 
  is 
  comparatively 
  long, 
  and 
  usually 
  presents 
  

   " 
  irregular 
  constrictions 
  and 
  a 
  more 
  slender, 
  blunt, 
  terminal 
  

   piece." 
  The 
  setigerous 
  process 
  bears 
  dorsally 
  a 
  single 
  simple 
  

   bristle, 
  " 
  curved 
  and 
  slightly 
  thickened 
  distally, 
  finely 
  toothed 
  

  

  