CHROMOSOMES IN TIIR SPERMATOGENESIS OV THE HKMII'TEKA URTEROPTERA. 171 



Plate XII. 

 Fii;a. 171-182, Melnpodiuf tfrmiiinll^. 

 Fig. 171, spermatocyte nucleus, synapsis. 

 Fig. 172, idem, postsynapsis. 

 Fig. 173, idem, rest stage. 



Fig. 174, late prophase of first maturation division. 

 Fig. 175, first maturation spindle. 

 Figs. 176, 177, pole views of tlie same spindle. 

 Fig. 178, anaphase of the first maturation division. 

 Fig. 179, daughter plate, early anaphase, first maturation division. 

 Fig. 180, pole view, second maturation division. 

 Figs. 181, 182, second maturation spindles. 



Figs. 183-195, CEilaneah dnisalis. 

 Fig. 183, spermatogonia monaster (v. 1901A, Fig. 154). 

 Fig. 184, spermatocyte nucleus just before rest period. 

 Fig. 185, idem, rest stage. 



Figs. 186-188, successive prophases of first maturation division. 

 Fig. 189, pole view, first maturation spindle. 



Figs. 190, 191, first maturation spindles (with 191 v. Fig. 158, 19016). 

 Fig. 192. pole view, second maturation spindle. 

 Fig. 193, second maturation spindle (v. 1901J, Fig. 157). 

 Fig. 194, second maturation anaphase. 

 Fig. 195, pole view of chromosomes of a spermatid. 



Figs. 196-199, Oiicopeltuf: fanciatuK. 

 Fig. 196, daughter plate, early anaphase of first maturation division (v. 1001ft, Fig. 171). 

 Figs. 197, 198, pole and lateral view, second maturation spindle. 

 Fig. 199, chromosome plate of a spermatid. 



Figs. 200-210, Pi'linpeltn ahhrevialn. 

 Fig. 200, spermatogonic monaster. 



Fig. 201, idem (v. 1901i, Fig. 149). 



Fig. 202, spermatocyte nucleus, synapsis. 



Fig. 203, idem, postsynapsis. 



Figs. 204, 205, late prophases, first maturation division. 



Fig. 206, pole view, first maturation spindle. 



Fig. 207, oblique lateral view of chromosomes of the same division. 



Fig. 208, first maturation spindle. 



Fig. 209, pole view, second maturation spindle. 



Fig. 210, second maturation spindle. 



Figs. 211-225, Iclmodemns fdlicus. 

 Fig. 211, spermatogonic monaster (v. 19016, Fig. 145). 

 Figs. 212, 213, spermatocyte nuclei, postsynapsis. 

 Fig. 214, idem, end of growth period. 



Figs. 215-219, successive prophases, first maturation division. 

 Fig. 220, first maturation spindle. 



Figs. 221, 222, pole views of first maturation spindles (v. 19016, Figs. 147, 148). 

 Fig. 223, second maturation spindle. 

 Fig. 224, pole view, second maturation spindle. 

 Fig. 225, chromosomes of a spermatid. 



