Plate I 



Entilia sinuata {Family Memhracida) 

 Fig. I Spermatogonia! rest stage. 

 Fig. i Spermatogonia! spireme. 



Fig. 3 Spermatogonium, segmentation of tlie spireme, each segment !ongitudina!!y sp!it. 

 Fig. 4 Spermatogonium, condensation of tlie segments of the spireme. 

 Fig. 5 Spermatogonia! equatoria! plate, 21 chromosomes. 

 Fig. 6 Spermatogonia! metaphase. 

 Fig. 7 Spermatogonia! anaphase. 



Fig. 8 Spermatogonia! telophase, formation of nuclear membrane. 

 Fig. 9 Spermatogonia! telophase.'polar view. 

 Fig. lo First spermatocyte, contraction stage. 

 Fig. 1 1 First spermatocyte, early postsynapsis stage. 

 Fig. 12 First spermatocyte, late postsynapsis, fine spireme. 

 Fig. 13 First spermatocyte, coarse spireme. 

 Fig. 14 First spermatocyte, rest stage. 

 Fig. 15 First spermatocyte, split spireme. 



Fig. 16 First spermatocyte, spireme divided into 11 split segments. 

 Figs. 17-19 First spermatocyte, early prophase, tetrad formation. 

 Fig. 20 First spermatocyte, late prophase, dumb-bell formation. 

 Fig. 21 First spermatocyte, equatorial plate, 11 chromosomes. 

 Fig. 22 First spermatocyte, metaphase, chromosomes still tetrads. 

 Figs. 23, 24 First spermatocyte, metaphase. 



Figs. 25, 26 First spermatocyte, anaphase, centrosomes divided for the second division. 

 Fig. 27 First spermatocyte, telophase. 

 Fig. 28 First spermatocyte, telophase, polar view. 



Fig. 29 Rearrangement of chromosomes for the second spermatocyte division. 

 Fig. 30 Second spermatocyte, equatorial plate, 1 1 chromosomes. 



