﻿Studies 
  on 
  Synapsis. 
  

  

  329 
  

  

  (28) 
  Nakahara, 
  " 
  Spermatogenesis 
  in 
  Perla,' 
  : 
  ' 
  Journ. 
  Morph.,' 
  vol. 
  33, 
  1919. 
  

  

  (29) 
  McClung, 
  "A 
  comparative 
  Study 
  of 
  the 
  Ckromosomes 
  in 
  Orthopteran 
  Spermato- 
  

  

  genesis," 
  'Journ. 
  Moi'ph.,' 
  vol. 
  25, 
  1914. 
  

  

  (30) 
  Baumgartner, 
  "Some 
  new 
  evidence 
  for 
  the 
  Individuality 
  of 
  the 
  Chromosomes, 
  1 
  ' 
  

  

  ' 
  Biol. 
  Bull.,' 
  vol. 
  8, 
  1904. 
  

  

  (31) 
  Sutton, 
  " 
  On 
  the 
  morphology 
  of 
  the 
  Chromosome 
  group 
  in 
  Brachystola," 
  ' 
  Biol. 
  Bull. 
  

  

  vol. 
  4, 
  1902. 
  

  

  32) 
  Davis, 
  " 
  Spermatogenesis 
  in 
  Acridida; 
  and 
  Locustida?," 
  ' 
  Bull. 
  Mus. 
  Com 
  p. 
  Zool.,' 
  

   1908. 
  

  

  (33) 
  Payne, 
  " 
  Chromosomal 
  variation, 
  etc., 
  in 
  the 
  European 
  Earwig, 
  Forficula," 
  ' 
  Journ. 
  

  

  Morph.,' 
  vol. 
  25, 
  1914. 
  

  

  (34) 
  Winiwartner 
  and 
  Saimont, 
  " 
  Nouvelles 
  recherches 
  sur 
  l'ovogenese 
  et 
  l'organogenese 
  

  

  de 
  l'ovaire 
  des 
  mammiferes," 
  ' 
  Arch, 
  de 
  Biol.,' 
  vol. 
  24, 
  1909. 
  

  

  DESCRIPTION 
  OF 
  PLATES. 
  

   Plate 
  10. 
  

  

  Figs. 
  1-3. 
  — 
  Oogonial 
  prophase, 
  stages. 
  

  

  Fig. 
  4. 
  — 
  Oogonial 
  metaphase, 
  equatorial 
  plate 
  (34 
  chromosomes). 
  

   Figs. 
  5-7. 
  — 
  Follicular 
  prophases. 
  

   Fig. 
  8. 
  — 
  Early 
  leptotene. 
  

  

  Fig. 
  9. 
  — 
  Leptotene 
  bouquet. 
  (Lateral 
  view.) 
  >n., 
  mitochondria. 
  

   Fig. 
  10. 
  — 
  -Ditto 
  in 
  section. 
  

   Fig. 
  11. 
  — 
  Synaptene 
  stage. 
  

  

  Fig. 
  12. 
  — 
  Pachytene 
  stage 
  (maximal 
  contraction 
  figure). 
  

  

  Figs. 
  13, 
  14. 
  — 
  Diplotene 
  post-synaptic 
  bouquet. 
  

  

  Fig. 
  15. 
  — 
  Early 
  diplotene 
  stage 
  in 
  section. 
  

  

  Fig. 
  16. 
  — 
  Segmentation 
  of 
  the 
  postsynaptic 
  spireme. 
  

  

  Plate 
  11. 
  

  

  Figs. 
  17-19 
  and 
  21. 
  — 
  Formation 
  of 
  and 
  dissolution 
  of 
  the 
  tetrads. 
  

   Fig. 
  20. 
  — 
  Late 
  oogonial 
  anaphase. 
  

  

  Figs. 
  21, 
  22. 
  — 
  Very 
  young 
  oocytes 
  at 
  inception 
  of 
  growth 
  phase, 
  n.p., 
  nuclear 
  particles 
  ; 
  

  

  m., 
  mitochondria 
  ; 
  b. 
  and 
  z.b., 
  Bacillus 
  cuenoti 
  ; 
  v., 
  cytoplasmic 
  vacuoles. 
  

   Fig. 
  23. 
  — 
  Germinal 
  vesicle 
  of 
  egg 
  at 
  later 
  stage, 
  showing 
  the 
  vacuolation 
  of 
  the 
  plasmo- 
  

  

  some. 
  

  

  Figs. 
  24-29. 
  — 
  Stages 
  in 
  the 
  appearance 
  of 
  the 
  deutosomes 
  within 
  plasmosome 
  in 
  acid- 
  

   fixed 
  logwood 
  preparations. 
  

   Fig. 
  30. 
  — 
  Zygotene 
  stage 
  of 
  the 
  bouquet 
  in 
  young 
  oocyte. 
  

  

  Plate 
  12. 
  

  

  Fig. 
  31. 
  — 
  Egg 
  at 
  inception 
  of 
  yolk 
  formation, 
  showing 
  migration 
  of 
  intranucleolar 
  

  

  deutosomes 
  to 
  the 
  periphery 
  of 
  the 
  egg 
  to 
  form 
  the 
  deutoplasmic 
  spheres. 
  

   Figs. 
  32, 
  33. 
  — 
  Spermatogonial 
  anaphases. 
  

  

  Figs. 
  34-36. 
  — 
  Stages 
  in 
  the 
  passage 
  of 
  the 
  telophasic 
  chromosomes 
  into 
  the 
  resting 
  

   nucleus 
  reticulum. 
  

  

  