﻿100 
  Prof. 
  M'liitosh's 
  Notes 
  from 
  the 
  

  

  the 
  first 
  two 
  of 
  which 
  are 
  small^ 
  but 
  tlie 
  rest 
  are 
  conspicuous 
  

   tufts 
  projectinf]f 
  from 
  setigerous 
  processes, 
  whicli 
  when 
  

   viewed 
  from 
  above 
  downward 
  are 
  nearl}'^ 
  cylindrical, 
  and 
  

   when 
  seen 
  antero-posteriorly 
  are 
  slightly 
  tapered 
  distally, 
  and 
  

   have 
  at 
  the 
  ventral 
  edge 
  of 
  the 
  bristle-tuft 
  a 
  clavate 
  papilla 
  

   wdiich 
  seems 
  to 
  have 
  escaped 
  Malmgren. 
  This 
  clavate 
  

   papilla 
  is 
  less 
  developed 
  in 
  front 
  than 
  in 
  the 
  posterior 
  seti- 
  

   gerous 
  processes, 
  where 
  it 
  is 
  much 
  larger 
  distally. 
  The 
  

   l)ristles 
  have 
  straight 
  striated 
  shafts 
  which 
  dilate 
  a 
  little 
  

   from 
  the 
  base 
  upward^ 
  continue 
  of 
  nearly 
  equal 
  diameter 
  to 
  

   the 
  commencement 
  of 
  the 
  wings, 
  and 
  then 
  curve 
  slightly 
  

   backward 
  and 
  taper 
  to 
  a 
  fine 
  tip. 
  The 
  strise 
  of 
  the 
  shaft 
  

   become 
  oblique 
  in 
  the 
  curved 
  terminal 
  region, 
  and 
  the 
  wings 
  

   themselves 
  are 
  striated 
  for 
  some 
  distance 
  upward. 
  These 
  

   bristles 
  are 
  evidently 
  much 
  used 
  by 
  the 
  annelid, 
  and 
  the 
  

   basal 
  striated 
  poition 
  of 
  the 
  wings 
  is 
  often 
  worn. 
  A 
  trans- 
  

   verse 
  ridge 
  with 
  a 
  small 
  dorsal 
  cirrus 
  curved 
  downward 
  

   represents 
  the 
  dorsal 
  division 
  behind 
  the 
  foregoing 
  and 
  to 
  

   the 
  tip 
  of 
  the 
  tail. 
  

  

  The 
  lamellse 
  for 
  hooks 
  commence 
  on 
  the 
  ventral 
  surface 
  of 
  

   the 
  seventh 
  segment 
  at 
  some 
  distance 
  from 
  the 
  setigerous 
  

   ])rocess, 
  and 
  at 
  the 
  posterior 
  edge 
  of 
  the 
  segment, 
  wider 
  

   anteriorly 
  and 
  gradually 
  diminishing. 
  A 
  more 
  or 
  less 
  dis- 
  

   tinct 
  ridge 
  posteriorly 
  connects 
  them 
  with 
  the 
  setigerous 
  

   processes. 
  The 
  first 
  are 
  small 
  and 
  little 
  elevated, 
  but 
  they 
  

   increase 
  in 
  prominence, 
  and 
  gradually 
  approach 
  the 
  seti- 
  

   gerous 
  process, 
  so 
  that 
  at 
  the 
  twelfth 
  or 
  thirteenth 
  bristle- 
  

   bnufUe 
  they 
  are 
  close 
  to 
  it, 
  and 
  the 
  last 
  is 
  nearly 
  as 
  

   prominent. 
  Thereafter 
  the 
  uncinigerous 
  processes 
  form 
  

   conspicuous 
  lamellae 
  on 
  each 
  side 
  of 
  the 
  posterior 
  region 
  to 
  

   the 
  tail. 
  Tlie 
  uucinigerous 
  lamella 
  has 
  in 
  the 
  preparations 
  

   a 
  slightly 
  irregular 
  or 
  crenulated 
  edge, 
  to 
  which 
  the 
  hooks 
  

   are 
  attached, 
  and 
  a 
  small 
  lanceolate 
  process 
  at 
  the 
  dorsal 
  

   edge. 
  The 
  hooks 
  have 
  six 
  prominent 
  teeth, 
  the 
  distal 
  region 
  

   being 
  tapeied 
  toward 
  the 
  crown 
  and 
  the 
  dorsal 
  or 
  pos- 
  

   torior 
  outline 
  has 
  a 
  marked 
  incurvation 
  above 
  the 
  base, 
  

   whilst 
  a 
  deep 
  bay 
  occurs 
  below 
  the 
  lower 
  tooth, 
  and 
  then 
  a 
  

   curved 
  prow. 
  In 
  the 
  largest 
  example 
  (over 
  2 
  inches) 
  

   from 
  deep 
  water, 
  the 
  hooks 
  remained 
  true 
  to 
  the 
  type, 
  five 
  

   large 
  upper 
  teeth 
  being 
  followed 
  by 
  a 
  smaller 
  process 
  above 
  

   the 
  prow. 
  De 
  St. 
  Joseph 
  mentions 
  seven 
  teeth 
  on 
  the 
  

   anterior 
  hooks 
  and 
  six 
  on 
  the 
  posterior; 
  the 
  anterior 
  rows 
  

   are 
  convex 
  forward, 
  but 
  the 
  posterior 
  are 
  nearly 
  straight. 
  

  

  After 
  the 
  bristles 
  cease 
  a 
  small 
  papilla 
  in 
  licatcs 
  the 
  site 
  

   of 
  the 
  setigerous 
  process, 
  and 
  the 
  papilla 
  by 
  and 
  by 
  projects 
  

   posteriorly 
  tVom 
  a 
  fused 
  lamella 
  which 
  has 
  a 
  dorsal 
  and 
  a 
  

  

  