﻿148 
  Prof. 
  M'lntosh's 
  Notes 
  from 
  the 
  

  

  for 
  a 
  Syllidand 
  ends 
  in 
  a 
  conical 
  tip, 
  and, 
  with 
  the 
  exception 
  

   of 
  the 
  three 
  anterior 
  segments, 
  the 
  organ 
  is 
  more 
  or 
  less 
  

   ringed. 
  It 
  therefore 
  differs 
  from 
  that 
  generally 
  seen 
  in 
  the 
  

   Staurocephalidae, 
  though 
  obscure 
  rings 
  are 
  occasionally 
  

   present 
  in 
  these, 
  while 
  in 
  the 
  form 
  of 
  the 
  conical 
  tip 
  it 
  agrees 
  

   with 
  that 
  group 
  (Staurocephalidae), 
  as 
  it 
  also 
  does 
  in 
  the 
  

   absence 
  of 
  the 
  tapering 
  form 
  so 
  characteristic 
  of 
  the 
  Syllids. 
  

   The 
  setigerous 
  lobe 
  again 
  has 
  a 
  conical 
  process 
  superiorly 
  

   more 
  marked 
  than 
  in 
  the 
  majority 
  of 
  the 
  Syllids, 
  yet 
  it 
  is 
  

   not 
  always 
  present 
  in 
  the 
  Staurocephalids. 
  The 
  tip 
  of 
  the 
  

   spine 
  terminates 
  in 
  a 
  large 
  flattened 
  and 
  roughened 
  knob, 
  a 
  

   condition 
  approaching 
  that 
  observed 
  in 
  certain 
  Syllids, 
  such 
  

   as 
  Odontosyllis 
  ctenostoma, 
  Syllis 
  spongicola, 
  &c. 
  A 
  striking- 
  

   feature 
  is 
  the 
  occurrence 
  at 
  the 
  dorsal 
  edge 
  of 
  the 
  fascicle 
  of 
  

   bristles 
  above 
  the 
  spine 
  of 
  a 
  single 
  simple 
  bristle, 
  which 
  is 
  

   curved, 
  slightly 
  thickened, 
  and 
  flattened 
  distally, 
  and 
  with 
  a 
  

   blunt 
  bifid 
  tip. 
  At 
  first 
  sight 
  this 
  bristle 
  resembles 
  that 
  

   found 
  in 
  certain 
  Staurocephalids, 
  such 
  as 
  Staurocephalus 
  

   rubrovittatus. 
  Further, 
  the 
  fan 
  of 
  compound 
  bristles 
  which 
  

   follows 
  forms 
  two 
  groups 
  in 
  the 
  text-figure, 
  an 
  arrangement 
  

   observed 
  in 
  certain 
  Staurocephalids, 
  the 
  large 
  size 
  of 
  the 
  

   terminal 
  processes 
  and 
  their 
  bifid 
  tips 
  also 
  resembling 
  those 
  

   of 
  the 
  latter 
  *. 
  On 
  the 
  whole, 
  therefore, 
  the 
  structure 
  of 
  the 
  

   bristles 
  would 
  indicate 
  relationship 
  with 
  the 
  Staurocephalidae 
  

   as 
  well 
  as 
  with 
  the 
  Syllidae. 
  In 
  the 
  sexually 
  mature 
  

   examples 
  a 
  tuft 
  of 
  long 
  delicate 
  capillary 
  bristles 
  arising 
  

   from 
  the 
  dorsal 
  and 
  posterior 
  face 
  of 
  the 
  setigerous 
  process 
  

   occurs 
  on 
  each 
  foot 
  after 
  the 
  eighth. 
  Such 
  bristles 
  occur 
  in 
  

   the 
  sexual 
  pelagic 
  forms 
  of 
  both 
  Syllids 
  and 
  Staurocephalids, 
  

   and 
  have 
  no 
  spine 
  in 
  either. 
  

  

  The 
  ventral 
  cirrus, 
  from 
  its 
  proportionately 
  great 
  length 
  

   and 
  slightly 
  crenate 
  condition, 
  diverges 
  from 
  that 
  usually 
  

   found 
  in 
  the 
  Syllidse 
  or 
  Staurocephalidae, 
  yet 
  it 
  agrees 
  with 
  

   both 
  in 
  being 
  borne 
  by 
  the 
  setigerous 
  lobe, 
  and, 
  as 
  a 
  rule, 
  

   well 
  outward. 
  

  

  On 
  the 
  whole, 
  then, 
  Mr. 
  Moore's 
  form 
  presents 
  interesting 
  

   features 
  of 
  relationship 
  with 
  both 
  groups, 
  the 
  shape 
  of 
  the 
  

   head, 
  the 
  peculiar 
  palpi, 
  the 
  tentacles 
  and 
  the 
  proboscis, 
  the 
  

   absence 
  of 
  a 
  dental 
  apparatus, 
  and 
  the 
  pygidium 
  leaning 
  so 
  

   far 
  to 
  the 
  Syllids, 
  whilst 
  the 
  structure 
  of 
  the 
  foot 
  and 
  its 
  

   bristles 
  recall 
  certain 
  features 
  observed 
  in 
  the 
  Staurocephalids. 
  

   More 
  minute 
  details 
  of 
  the 
  structure 
  of 
  the 
  foot 
  and 
  bristles 
  

   by 
  the 
  author 
  would 
  be 
  useful 
  in 
  enabling 
  a 
  more 
  precise 
  

   view 
  of 
  its 
  relationships 
  to 
  be 
  made. 
  

  

  . 
  * 
  Fig. 
  2 
  d, 
  

  

  