Munson. — Spermatogenesis of Papilio. 
Fig. 56. 
Fig. 57a 
Fig. 57b 
Fig. 58. 
Fig. 59. 
Fig. 60. 
Fig. 61. 
Fig. 62. 
Fig. 63. 
Fig. 64. 
Fig. 65. 
Fig. 66. 
Fig. 67. 
Fig. 68. 
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Fig. 70. 
Fig. 71. 
Fig. 72. 
Fig. 73. 
Fig. 74. 
Fig. 75. 
Fig. 76. 
Fig. 77. 
Fig. 78. 
Fig. 79. 
Fig. 80. 
Fig. 81. 
Fig. 82. 
Fig. 83. 
Fig. 84. 
Fig. 85. 
Fig. 86. 
Fig. 87. 
Fig. 88. 
Fig. 89. 
PLATE 15. 
Grandmother stem cell, from pupa, Feb. 15th. 
Grandmother stem cell with branch cells and cortical nuclei. 
Transverse section of branch cells showing cortical nuclei. 
Spermatogone with peripheral nucleus. 
Spermatogone with dividing centrosomes. 
Spermatogone in metaphase of mitosis. 
Spermatogone in anaphase of mitosis. 
Spermatogone in telophase of mitosis, and showing remnant of first 
spindle. 
Spermatogone in telophase of mitosis. 
Gonocyst in two-celled stage. 
Gonocyst in resting eight-celled stage. 
Gonocyst of sixteen-celled stage in mitosis. 
Part of gonocyst showing anaphase of mitosis. 
Stalked cell. 
Stalked cell set free. 
Spermatogonium in resting state. 
Resting spermatogonium preparing for division. 
Section through equatorial plate showing chromosomes. 
Aster of spermatogone seen from pole. 
Spermatogone in telophase of mitosis. 
Growing spermatogone (spermatocyte). 
Spermatocyte, prophase of first maturation division. 
Stalked cell. 
Spermatocyte, prophases of first maturation division. 
Metaphase of mitosis, spermatocyte first order. 
Telophase of mitosis, spermatocyte first order. 
Division phases of spermatocytes. 
Division phases of spermatocytes. 
Free stalked cell. 
Free stalked cell divided. 
Free stalked cell in metaphase of karyokinesis. 
Prophase of spermatocyte first maturation division. 
Spermatocyte first order with only one developed aster. 
Spermatocyte in metaphase of first maturation division. 
Section of dividing spermatocyte through equatorial plate, showing 
lineal arrangement of chromosomes. 
