﻿THE 
  ANATOMY 
  OF 
  PCEOILOOHiETlJS, 
  CLA.PAREDE. 
  149 
  

  

  Fig. 
  11. 
  — 
  Parapodium 
  30, 
  left 
  side, 
  x 
  06. 
  

  

  Fig. 
  12. 
  — 
  Poeciloclisetus 
  serpens 
  iu 
  burrow 
  constructed 
  in 
  sand 
  

   between 
  two 
  glass 
  plates. 
  Natural 
  size. 
  

  

  Fig. 
  13. 
  — 
  Smooth 
  bristle 
  from 
  parapodium 
  7. 
  X 
  380. 
  

  

  Y'IG. 
  li. 
  — 
  Large, 
  stiff, 
  hairy 
  bristle 
  from 
  parapodium 
  30. 
  X 
  3S0. 
  

  

  Fig. 
  15.— 
  Spined 
  bristle 
  from 
  parapodium 
  10. 
  X 
  380. 
  

  

  Pig. 
  16. 
  — 
  Small, 
  flexible, 
  hairy 
  bristle 
  from 
  parapodium 
  30. 
  x 
  380. 
  

  

  Fig. 
  17. 
  — 
  Membranous 
  spined 
  bristle 
  from 
  parapodium 
  20. 
  x 
  380. 
  

  

  Fig. 
  is. 
  — 
  Bristle 
  with 
  hairy 
  terminal 
  brush 
  from 
  twentieth 
  parapodium 
  

   from 
  end. 
  x 
  380. 
  

  

  Fig. 
  19. 
  — 
  Stout 
  hooks 
  of 
  the 
  notopodium 
  from 
  the 
  dorsal 
  surface 
  of 
  the 
  

   seventh 
  segment 
  from 
  the 
  end. 
  X 
  100. 
  

  

  F'iG. 
  20. 
  — 
  Transverse 
  section 
  of 
  epithelium 
  from 
  the 
  anterior 
  dorsal 
  surface. 
  

   X 
  1180. 
  

  

  Fig. 
  21. 
  — 
  Transverse 
  section 
  of 
  epithelium 
  from 
  the 
  ventral 
  surface, 
  just 
  

   behind 
  the 
  mouth. 
  X 
  1180. 
  

  

  PLATE 
  10. 
  

  

  F'iG. 
  23. 
  — 
  Unicellular 
  epithelial 
  gland 
  from 
  anterior 
  portion 
  of 
  body. 
  

   X 
  1180. 
  

  

  PiG. 
  23. 
  — 
  Section 
  of 
  gland-cells 
  and 
  tubercle 
  from 
  posterior 
  end 
  of 
  body. 
  

   X 
  1180. 
  

  

  F'lG. 
  24. 
  — 
  Section 
  of 
  parapodial 
  cirrus 
  (about 
  segment 
  20). 
  x 
  220. 
  

  

  I'lG. 
  25. 
  — 
  Cirrus 
  from 
  near 
  tail 
  of 
  living 
  worm. 
  

  

  Figs. 
  26 
  — 
  29. 
  — 
  Gland-cells 
  from 
  jiarapodial 
  cirri, 
  x 
  1180. 
  

  

  Pig. 
  so. 
  — 
  Transverse 
  section 
  through 
  the 
  base 
  of 
  the 
  palps 
  and 
  palp- 
  

   ganglia. 
  X 
  135. 
  

  

  Fig. 
  31. 
  — 
  Transverse 
  section 
  of 
  a 
  gill 
  filament, 
  x 
  400. 
  

  

  Fig. 
  32. 
  — 
  Transverse 
  section 
  of 
  the 
  ventral 
  nerve-cord, 
  x 
  220. 
  

  

  Fig. 
  33 
  — 
  Sagittal 
  section 
  through 
  a 
  ventral 
  eye. 
  x 
  640. 
  

  

  Pig. 
  34. 
  — 
  Horizontal 
  section 
  through 
  a 
  lateral 
  sense-organ 
  of 
  the 
  genital 
  

   region. 
  X 
  600. 
  

  

  Pig. 
  35. 
  — 
  Transverse 
  section 
  through 
  a 
  lateral 
  sense-organ 
  of 
  the 
  genital 
  

   region 
  passing 
  through 
  the 
  anterior 
  row 
  of 
  muscle-bands. 
  X 
  690. 
  

  

  Fig. 
  36. 
  — 
  Transverse 
  seel 
  ion 
  through 
  a 
  lateral 
  sense-organ 
  of 
  the 
  genital 
  

   region 
  passing 
  through 
  the 
  hair-bearing 
  cells, 
  x 
  690. 
  

  

  I'iG. 
  37. 
  — 
  Transverse 
  section 
  through 
  a 
  lateral 
  sense-organ 
  of 
  the 
  genital 
  

   region 
  passing 
  through 
  the 
  posterior 
  row 
  of 
  muscle-bands, 
  x 
  690, 
  

  

  