﻿AUG 
  2» 
  1920 
  V 
  

  

  Studies 
  on 
  Synapsis. 
  \ 
  n 
  '293 
  

  

  Fig. 
  31. 
  — 
  Full-grown 
  egg 
  (diagrammatic), 
  showing 
  deeply 
  staining 
  body 
  (polar 
  disc) 
  at 
  

  

  posterior 
  pole 
  and 
  nucleus 
  at 
  the 
  periphery 
  at 
  one 
  side. 
  

   Fig. 
  32. 
  — 
  Nucleus 
  after 
  the 
  " 
  diffuse 
  " 
  stage 
  with 
  diploid 
  chromosomes 
  : 
  vacuolated 
  

  

  plasmosome 
  and 
  two 
  karyosomes. 
  

   Fig. 
  33. 
  — 
  End 
  to 
  end 
  pairing 
  of 
  filamentous 
  chromosomes. 
  

  

  Fig. 
  34, 
  a, 
  b, 
  c. 
  — 
  Showing 
  haploid 
  number 
  of 
  bivalents 
  with 
  condition 
  indicating 
  their 
  

  

  double 
  nature 
  ; 
  ring-like 
  karyosomes 
  and 
  plasmosomes. 
  

   Fig. 
  35. 
  — 
  Formation 
  of 
  maturation 
  spindle. 
  

   Fig. 
  36.— 
  Abortive 
  maturation 
  spindle. 
  

   Figs. 
  37, 
  38. 
  — 
  Condensation 
  of 
  same. 
  

  

  Plate 
  8. 
  — 
  Synergus 
  and 
  Orthopehna. 
  

  

  Figs. 
  39-41. 
  — 
  Synergus 
  Rheinhardii. 
  Formation 
  of 
  Oosoma 
  and 
  secondary 
  nuclei. 
  

   Fig. 
  39. 
  — 
  Cloud 
  of 
  granules 
  at 
  posterior 
  end 
  : 
  spherical 
  chromatin 
  granules 
  disposed 
  

  

  in 
  the 
  cytoplasm. 
  . 
  

   Fig. 
  40. 
  — 
  Granules 
  at 
  posterior 
  pole 
  condensing. 
  Large 
  chromatin 
  granules 
  fragmenting 
  

  

  in 
  the 
  periphery 
  of 
  the 
  egg. 
  

   Fig. 
  41. 
  — 
  Secondary 
  nuclei 
  in 
  periphery 
  of 
  egg 
  ; 
  g.v. 
  = 
  germinal 
  vesicle. 
  

  

  Figs. 
  42-52. 
  — 
  Orthopdma 
  luteolator. 
  

   Fig. 
  42. 
  — 
  Rosette 
  showing 
  synchronous 
  division 
  of 
  cells, 
  and 
  22 
  chromosomes 
  at 
  one 
  end 
  

  

  of 
  spindle, 
  — 
  larva 
  shortly 
  before 
  pupation. 
  

   Figs. 
  43, 
  44. 
  — 
  Synizesis 
  nuclei. 
  

   Fig. 
  45. 
  — 
  Young 
  nurse 
  cell 
  : 
  haploid 
  number. 
  

   , 
  Fig. 
  46. 
  — 
  Young 
  oocyte 
  and 
  nurse 
  chamber. 
  Nucleus 
  shortly 
  before 
  " 
  diffuse 
  " 
  stage 
  

  

  shows 
  haploid 
  number 
  of 
  bivalents. 
  (Magnification 
  reduced.) 
  

   Fig. 
  47. 
  — 
  Later 
  stage 
  : 
  diploid 
  number 
  of 
  chromosomes. 
  

   Fig. 
  48. 
  — 
  Second 
  syndesis. 
  

  

  Fig. 
  49. 
  — 
  Abortive 
  maturation 
  spindle 
  : 
  no 
  asters 
  or 
  centrosomes. 
  

  

  Fig. 
  50. 
  — 
  Condensation 
  of 
  same. 
  

   ^ 
  Fig. 
  51. 
  — 
  " 
  Chromatin 
  nucleus," 
  showing 
  vacuolated 
  structure 
  : 
  just 
  before 
  laying. 
  

   G 
  Fig. 
  52. 
  — 
  Full-grown 
  egg, 
  " 
  chromatin 
  nucleus 
  " 
  in 
  nucleoplasms 
  zone, 
  oosoma, 
  etc. 
  

   (Diagrammatic.) 
  

  

  Plate 
  9. 
  — 
  Lasius 
  and 
  Formica. 
  

   Figs. 
  53-57. 
  — 
  Lasius 
  Jlava. 
  

   ,Fig. 
  53. 
  — 
  Terminal 
  chamber 
  (t.c.) 
  and 
  filament 
  (£./.), 
  rosettes 
  (r.), 
  epithelial 
  nuclei 
  (ep.n.), 
  

   " 
  bouquet 
  " 
  nuclei 
  (b.) 
  

   {flFig. 
  54. 
  — 
  Synizesis. 
  

  

  igFig. 
  55. 
  — 
  Haploid 
  number 
  of 
  pachytene 
  threads 
  from 
  post-synaptic 
  spireme. 
  

  

  Fig. 
  56. 
  — 
  Diplotene 
  nuclei. 
  

   QFig. 
  57.— 
  T.S. 
  first 
  zone 
  of 
  growth 
  ; 
  nurse 
  cells, 
  follicular 
  epithelia 
  and 
  oocyte 
  nucleus 
  

   in 
  " 
  diffuse 
  " 
  stage. 
  

   Figs. 
  58-60. 
  — 
  Formica 
  rufa. 
  

   Fig. 
  58. 
  — 
  Young 
  oocyte 
  with 
  follicle 
  complete 
  : 
  secondary 
  nuclei 
  around 
  germinal 
  

   vesicle. 
  

  

  Fig. 
  59. 
  — 
  Later 
  : 
  migration 
  of 
  secondary 
  nuclei 
  to 
  periphery. 
  

   Fig. 
  60a. 
  — 
  Follicle 
  cell 
  and 
  nucleus. 
  

  

  Fig. 
  606. 
  — 
  Yolk 
  and 
  secondary 
  nuclei 
  of 
  full-grown 
  egg. 
  

  

  VOL. 
  XCI. 
  — 
  B. 
  

  

  