Munson. — Spermatogenesis of Papilio. 
PLATE 16. 
Maturation divisions of spermatocytes. 
Fig. 
90. 
Fig. 
91. I 
Fig. 
92. ! 
Fig. 
93. 
Fig. 
94. 1 
Fig. 
95. ; 
Fig. 
96. : 
Fig. 
97. 
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98. 
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99. 
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100. 
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101. 
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102. 
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103. 
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104. 
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105. 
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106. 
Fig. 
107. 
Fig. 
107a. 
Fig. 
108. 
Fig. 
109. 
Fig. 
110. 
Fig. 
110a. 
Fig. 
111. 
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112. 
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113. 
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121. 
Spermatocyte first order at rest. 
Spermatocyte first order with dividing centrosome. 
Spermatocytes first order with developed asters. 
Spermatocyte first order with aster and indented nucleus. 
Spermatocyte with spireme of first maturation division. 
Spermatocyte with contracted spireme. 
Spermatocyte with double spireme. 
Spermatocyte with second doubling of the thread. 
Spermatocyte with segmenting spireme. 
Spermatocyte with dividing spireme. 
Spermatocyte showing tetrad formation. 
Spermatocyte with distributed tetrads. 
Spermatocyte tetrads and connecting fibers. 
Spermatocyte with diads. 
Spermatocytes with distributed diads. 
Spermatocyte with diads showing polar arrangement of fibers. 
Spermatocyte with disappearing nuclear membrane and first stages 
of spindle. 
Spermatocyte first order, prophase of mitosis. 
Spermatocyte first order, metaphase of mitosis. 
Spermatocyte in metaphase of first maturation division. 
Spermatocyte in metaphase of first maturation division, showing 
aster and original boundary of nucleus. 
Section through equator of spindle showing twenty-eight chromo¬ 
somes in equatorial plate. 
Spermatocyte first order showing polar view of aster. 
Spermatocyte in metaphase of first maturation division. 
Spermatocyte first order in anaphase of first maturation division. 
Telophase of first maturation division. 
Telophase of first maturation division and preparation for the sec¬ 
ond maturation division. 
Spermatocyte in telophase of first maturation division and in ana¬ 
phase of second maturation division. 
First and second maturation division of spermatocyte of first and 
second order. 
Spermatocyte second order showing anaphase of second matura¬ 
tion division. 
Spermatocyte second order, telophase of second maturation divi¬ 
sion showing formation of nebenkern. 
Formation of spermatids with nebenkern. 
Spermatocyte second order showing constriction of cytoplasm, 
and the formation of nebenkern. 
Forming spermatids with nebenkern. 
