﻿148 
  E. 
  J. 
  ALLEN. 
  

  

  shaped 
  gland-cells 
  of 
  the 
  oesophagus, 
  gsl. 
  Gonosfomo. 
  i. 
  bl. 
  s. 
  lutesfiiial 
  

   blood-sinus. 
  iiitest. 
  liitesUiie. 
  int. 
  v. 
  Blood-vessel 
  from 
  walls 
  of 
  ali- 
  

   mentary 
  caual 
  to 
  ventral 
  vessel. 
  !al. 
  v. 
  Lateral 
  blood-vessel. 
  I. 
  o. 
  Lateral 
  

   sense-organ. 
  Ip.gat.d. 
  Dorsal 
  lip 
  of 
  gonostome. 
  Ip.gst.v. 
  Ventral 
  lip 
  

   of 
  gonostome. 
  Ip. 
  nst. 
  Lip 
  of 
  nephridiostonie. 
  /. 
  r. 
  Long 
  rods 
  of 
  lateral 
  

   sense-organ, 
  nuchal 
  organ, 
  and 
  epithelium 
  of 
  oesophagus, 
  m. 
  b. 
  Mid-brain. 
  

   m.f. 
  Muscle-fibres, 
  m.p. 
  Middle-piece 
  of 
  spermatozoon, 
  m.tent. 
  Median 
  

   tentacle, 
  nith. 
  Mouth, 
  vmsc. 
  Muscle, 
  n. 
  Nucleus 
  ; 
  n! 
  see 
  page 
  97. 
  nh. 
  

   Supposed 
  nuclei 
  of 
  hair-bearing 
  cells, 
  n. 
  p. 
  1, 
  n. 
  p. 
  2. 
  First 
  and 
  second 
  roots 
  

   of 
  nerve 
  of 
  palp-ganglion, 
  np/i. 
  Nei)hridial 
  tube. 
  nr. 
  c. 
  Neuropodial 
  cirrus. 
  

   list. 
  Nephridiostonie. 
  w^. 
  c. 
  Notopodial 
  cirrus. 
  ?^«(;//. 
  Nuchal 
  organ, 
  nucrjan. 
  

   Nuchal 
  ganglion, 
  ccs. 
  CEsophagus. 
  p. 
  Process 
  from 
  callosity, 
  see 
  page 
  97. 
  

   p. 
  bv. 
  Palp 
  blood-vessel, 
  p. 
  dv. 
  Lateral 
  pouch 
  of 
  dorsal 
  blood-vessel, 
  ph. 
  

   Pharynx, 
  pip. 
  Palp. 
  pip. 
  div. 
  Diverticle 
  of 
  palj). 
  pip. 
  v. 
  Palp-valve, 
  sep. 
  

   Septum 
  dividing 
  body 
  segments, 
  sh. 
  Sensory 
  hairs 
  of 
  lateral 
  sense-organs. 
  

   si\ 
  Short 
  rods 
  of 
  lateral 
  organs, 
  nuchal 
  organ, 
  and 
  epithelium 
  of 
  oesophagus. 
  

   sr. 
  2. 
  Secondary 
  layer 
  of 
  short 
  rods 
  in 
  lateral 
  organs, 
  v. 
  Point 
  where 
  pharynx 
  

   joins 
  intestine, 
  ve/il. 
  v. 
  Ventral 
  blood-vessel, 
  vl. 
  seg. 
  14. 
  Valve 
  in 
  dorsal 
  

   blood-vessel 
  between 
  segments 
  14 
  and 
  15 
  (open), 
  vl. 
  seg. 
  15. 
  Valve 
  in 
  dorsal 
  

   blood-vessel 
  between 
  segments 
  15 
  and 
  16 
  (closed), 
  j/li. 
  n. 
  Yolk 
  nucleus. 
  

  

  All 
  sections 
  and 
  the 
  majority 
  of 
  the 
  other 
  (igures 
  were 
  drawn 
  with 
  the 
  

   camera 
  lucida. 
  

  

  PLATE 
  7. 
  

  

  Pir,. 
  L 
  — 
  Anterior 
  segments 
  of 
  Pcecilocha;tns 
  serpens. 
  The 
  vascular 
  

   system 
  is 
  somewhat 
  diagrammatic, 
  having 
  been 
  reconstructed 
  from 
  sections. 
  

   X 
  ca 
  25. 
  

  

  Fig. 
  2. 
  — 
  Parapodium 
  3, 
  left 
  side. 
  X 
  GO. 
  

  

  Pig. 
  3. 
  — 
  Parapodium 
  5, 
  left 
  side. 
  X 
  G6. 
  

  

  Pig. 
  4. 
  — 
  Parapodium 
  7, 
  left 
  side. 
  X 
  66. 
  

  

  Fig. 
  5. 
  — 
  Parapodium 
  13, 
  left 
  side. 
  X 
  66. 
  

  

  PLATE 
  8. 
  

  

  Fig. 
  6.— 
  Terminal 
  segments, 
  dorsal 
  view, 
  x 
  ca 
  50. 
  

   F'iG. 
  7. 
  — 
  Head 
  end, 
  dorsal 
  view. 
  X 
  ca 
  50. 
  

   F'iG. 
  8. 
  — 
  Head 
  end, 
  ventral 
  view, 
  x 
  ca 
  50. 
  

  

  PLATE 
  9. 
  

  

  FiG. 
  9. 
  — 
  Parapodium 
  14, 
  left 
  side. 
  X 
  66. 
  

   FiG. 
  10.— 
  Parapodium 
  18, 
  left 
  side. 
  X 
  66. 
  

  

  