﻿416 
  

  

  R. 
  T. 
  Young, 
  

  

  Fig. 
  8. 
  Anlage 
  of 
  uterus 
  showing 
  two 
  centers 
  of 
  development. 
  

   Fig. 
  9. 
  Anlage 
  of 
  ovary. 
  

  

  Fig. 
  10. 
  Developing 
  vagina 
  and 
  vas 
  deferens 
  showing 
  transient 
  

   epithelium 
  and 
  basement 
  membrane 
  (the 
  latter 
  is 
  shown 
  only 
  in 
  the 
  vas). 
  

   Fig. 
  11. 
  Adult 
  vagina 
  and 
  penis 
  showing 
  cuticula 
  and 
  penis 
  sack. 
  

   Fig. 
  12. 
  Developing 
  vagina 
  showing 
  epithelial 
  nuclei. 
  

  

  Fig. 
  13. 
  Developing 
  penis 
  showing 
  nuclear 
  remnants 
  in 
  the 
  epi-^ 
  

   thelium 
  at 
  x. 
  

  

  Fig. 
  14. 
  

  

  Fig. 
  15. 
  

  

  "prostate 
  cell" 
  

  

  Fig. 
  16. 
  

  

  Fig. 
  17. 
  

  

  Fig. 
  18. 
  

  

  Fig. 
  19. 
  

  

  Fig. 
  20. 
  

   nucleus 
  at 
  x. 
  

  

  Fig. 
  21. 
  

   nucleus 
  at 
  x. 
  

  

  Fig. 
  22. 
  

   muscles 
  at 
  m. 
  

  

  Fig. 
  23. 
  

  

  Fig. 
  24. 
  

  

  Fig. 
  25. 
  

  

  Fig. 
  26. 
  

  

  Fig. 
  27. 
  

  

  Fig. 
  28. 
  

  

  Fig. 
  29. 
  

  

  Plate 
  19. 
  

  

  Nearly 
  adult 
  vagina 
  showing 
  epithelial 
  nucleus 
  at 
  .r. 
  

  

  Adult 
  vas 
  deferens 
  showing 
  epithelial 
  nucleus 
  at 
  j', 
  and 
  

   at 
  x^. 
  

  

  Early 
  stage 
  of 
  uterus^ 
  oviduct, 
  and 
  shell 
  gland. 
  

  

  Early 
  stage 
  of 
  oviduct 
  and 
  shell 
  gland. 
  

  

  Adult 
  oviduct, 
  yolk 
  duct 
  and 
  shell 
  gland. 
  

  

  Anlage 
  of 
  yolk 
  duct 
  and 
  branches. 
  

  

  Wall 
  of 
  branch 
  of 
  adult 
  oviduct 
  , 
  showing 
  epithelial 
  

  

  Wall 
  of 
  adult 
  seminal 
  receptacle 
  showing 
  epithelial 
  

  

  Ampulla 
  of 
  adult 
  oviduct, 
  showing 
  delicate 
  circular 
  

  

  Early 
  anläge 
  of 
  oviduct 
  and 
  shell 
  gland. 
  

  

  Wall 
  of 
  adult 
  uterus 
  showing 
  epithelial 
  nucleus 
  at 
  .r. 
  

  

  Adult 
  vagina 
  showing 
  longitudinal 
  muscles. 
  

  

  Follicles 
  and 
  cords 
  of 
  adult 
  ovary. 
  

  

  Developing 
  oviduct 
  and 
  branches 
  and 
  seminal 
  receptacle. 
  

  

  Wall 
  of 
  adult 
  vas 
  deferens 
  showing 
  circular 
  muscles 
  at 
  m. 
  

  

  Adult 
  vas 
  efferens 
  showing 
  epithelial 
  nucleus 
  at 
  x. 
  

  

  Plate 
  20. 
  

  

  Fig. 
  30. 
  Egg, 
  showing 
  membrane, 
  ? 
  

  

  Fig. 
  31. 
  Sperm 
  entrance. 
  

  

  Fig. 
  32. 
  Adult 
  ova. 
  

  

  Figs. 
  33 
  and 
  34. 
  Early 
  ovarian 
  follicles. 
  

  

  Fig. 
  35. 
  Early 
  testis 
  showing 
  amitosis 
  of 
  cells 
  a 
  and 
  b. 
  

  

  Fig. 
  36. 
  Idem, 
  showing 
  chromidial 
  extrusion 
  from 
  nucleus 
  into 
  

   cytoplasm 
  at 
  c. 
  

  

  Fig. 
  37. 
  Idem, 
  showing 
  daughter 
  cells 
  a, 
  b 
  and 
  c 
  separating 
  amitotically 
  

   from 
  the 
  parent 
  cell. 
  

  

  