﻿150 
  fc]. 
  J. 
  ALLKN. 
  

  

  Fig. 
  3S. 
  — 
  Section 
  tlirougli 
  Uie 
  extremity 
  of 
  a 
  iatei;il 
  sense- 
  orj^an 
  of 
  the 
  

   genital 
  region 
  in 
  tlie 
  longitudinal 
  veiticai 
  (sagittal) 
  plane 
  of 
  the 
  body. 
  X 
  375. 
  

  

  Fig. 
  39. 
  — 
  Section 
  tlirough 
  a 
  lateral 
  sense-organ 
  of 
  the 
  anterior 
  region. 
  

   X 
  090. 
  

  

  PLATE 
  11. 
  

  

  Fig. 
  40.— 
  Section 
  through 
  a 
  ciliated 
  groove 
  of 
  the 
  inichal 
  organ. 
  X 
  (340. 
  

  

  Fig. 
  41. 
  — 
  Enlarged 
  view 
  of 
  ciliated 
  cells 
  of 
  the 
  nnc'.ial 
  organ. 
  X 
  1180. 
  

  

  Fig. 
  42. 
  — 
  Sagittal 
  section 
  through 
  the 
  mouth 
  and 
  median 
  tentacle. 
  X 
  fi6. 
  

  

  Fig. 
  43. 
  — 
  Horizontal 
  section 
  through 
  segments 
  8 
  to 
  14. 
  x 
  42. 
  

  

  Fig. 
  44. 
  — 
  Transverse 
  section 
  through 
  ciliated 
  epithelium 
  of 
  the 
  oesophagus. 
  

   X 
  690. 
  

  

  Fig. 
  45. 
  — 
  Transverse 
  section 
  through 
  epithel 
  uni 
  of 
  the 
  intestine, 
  when 
  the 
  

   latter 
  is 
  filled 
  with 
  food 
  and 
  digestion 
  is 
  actively 
  going 
  on. 
  X 
  690. 
  

  

  Fig. 
  46. 
  — 
  Transverse 
  section 
  llnough 
  epithelium 
  of 
  the 
  intestine, 
  when 
  

   digestion 
  is 
  not 
  active. 
  X 
  690. 
  

  

  Fig. 
  47. 
  — 
  Sagittal 
  section 
  tlirough 
  the 
  first 
  sixteen 
  segments. 
  X 
  42. 
  

  

  PiG_ 
  48. 
  — 
  Transverse 
  section 
  through 
  anterior 
  region, 
  showing 
  junction 
  of 
  

   the 
  lateral 
  vessels 
  with 
  the 
  ventral 
  vessel. 
  X 
  42. 
  

  

  FiG. 
  49. 
  — 
  Transverse 
  section 
  through 
  anterior 
  region, 
  showing 
  cluster 
  of 
  

   finger-shaped 
  processes 
  uniting 
  to 
  t.he 
  branch 
  of 
  the 
  lateral 
  blood-vessel. 
  

   X 
  42. 
  

  

  Fig. 
  50. 
  — 
  Sagittal 
  section 
  through 
  the 
  dorsal 
  blood-vessel 
  in 
  segments 
  14 
  

   and 
  15, 
  showing 
  the 
  valves. 
  X 
  132. 
  

  

  PLATE 
  12. 
  

  

  Fig. 
  51. 
  — 
  Sagittal 
  section 
  tlirough 
  two 
  segments 
  of 
  the 
  anterior 
  region, 
  

   showing 
  the 
  branch 
  of 
  the 
  lateral 
  vessel 
  going 
  into 
  the 
  segment 
  behind 
  and 
  

   breaking 
  up 
  into 
  finger-shaped 
  |)rocesses. 
  X 
  88. 
  

  

  Fig. 
  52. 
  — 
  Sagittal 
  section 
  of 
  a 
  nephridium 
  and 
  genital 
  funnel 
  of 
  a 
  male 
  

   genital 
  segment. 
  X 
  212. 
  

  

  Fig. 
  53. 
  — 
  Spermatozoa, 
  x 
  1770. 
  

  

  Fig. 
  54. 
  — 
  Sagittal 
  section 
  through 
  the 
  nephridiostome 
  of 
  an 
  anterior 
  

   segment. 
  X 
  424. 
  

  

  Fig. 
  55. 
  — 
  Transverse 
  section 
  through 
  the 
  lip 
  of 
  the 
  nephridiostome 
  of 
  an 
  

   anterior 
  segment. 
  X 
  424. 
  

  

  Fig. 
  50. 
  — 
  Ciliated 
  epithelium 
  of 
  the 
  dorsal 
  lip 
  of 
  a 
  genital 
  funnel 
  X 
  IISO. 
  

  

  