318 N. M. Stevens. 



Figs. 75 and 76. Tangential sections of nuclear membrane and network of 

 oocytes of S. el. 1.5 mm. -4. 



Figs. 77 and 78. Similar sections from S. decipiens. 1.5 mm.-4. 



Figs. 79 and 80. Synizesis stages of young oocyte of S. bip. 1.5 mm. -12. 



Fig. 81. Bouquet stage of young oocyte of S. bip. 1.5 mm. -12. 



Figs. 82 and 83. First spermatocyte metaphase, S. bip., 9 chromosomes in the 

 eq. plate. 2 mm.-12Xl|. 



Fig. 84. First spermatocyte metaphase, 8 chromosomes in the equatorial plate, 

 one (x) precociously divided. Mag. as above. 



Fig. 85. First- spermatocyte metaphase showing tetrads. Same mag. 



Fig. 86. First spermatocyte prophase showing x divided. Same mag. 



Fig. 87. First spermatocyte metaphase of S. inflata, 9 chromosomes in the eq. 

 plate. 



Fig. 88. First spermatocyte metaphase of S. infl., one chromosome precociously 

 divided. 



Fig. 89. First spermatocyte metaphase, one chromosome (x) larger, bent, and 

 peculiarly attached to the spindle fibers. 



Fig. 90. First spermatocyte metaphase showing tetrads and precociously 

 divided chromosomes. 



Fig. 91. First spermatocyte metaphase, x dividing again. 



Fig. 92. Second spermatocyte prophase, showing x divided. 



Fig. 93. First spermatocyte anaphase, oblique view of daughter plate showing 

 longitudinal splitting of chromosomes. 2 mm. -12X2. 



