The Spermatogenesis in Pentatoma up to the Formation of the Spermatid. 37 



Plate 3. 



Figs. 101 — 104. 1st spermatocytes, commencement of the prophase 

 The whole nucleus shown in Fig. 104. 



Figs. 105 — 116. 1st spermatocytes, nuclei in the dense spirem* 

 stage. All show the nuclei in their entirety with the exception of 

 Fig. 113, which shows only one surface of the nucleus. There are either 

 3 or 4 chromosomes in Fig. Ill; 3 in Figs. 107, 108, 112, 115; 4 in 

 Figs. 105, 106, 109, 113, 116; 5 in Figs. 110, 114. 



Figs. 117 — 122. 1st spermatocytes, loose spirem, shortening and 

 thickening of the chromosomes. All except Fig. 119 show the entire 

 nucleus. Fig. 118 shows an abnormally small nucleus, found among 

 others of the normal size. 



Fig. 123. 1st spermatocyte, loose spirem, showing abnormal 

 vacuolisation of the cytoplasm. 



Figs. 124 — 149. 1st spermatocytes, loose spirem stages and 

 shortening of the chromosomes. All except Figs. 135, 142, 145 and 

 146 show all the chromosomes in the nuclei. 



Fig. 150. 1st spermatocyte nucleus shortly before the disappearance 

 of the nuclear membrane in the prophase. On its surface, marked by 

 the dotted line (which does not represent the greatest diameter of the 

 nucleus), are seen two fibres (central spindle fibres?) which seem to 

 connect the centrosomes. 



Figs. 151 — 153. 1st spermatocytes, in a stage just following the 

 preceding. 



Plate 4. 



Figs. 154 — 159. 1st spermatocytes, prophase of the monaster. 

 Figs. 154 and 158 show entire nuclei; in Fig. 159 only one pair of 

 centrosomes lie in the plane of the section. 



Figs. 160 — 168. 1st spermatocytes, prophases of the monaster, the 

 nuclear membrane no longer present. In Fig. 162 ic denotes the halves 

 of a prematurely divided chromosome. 



Fig. 169. 1st spermatocyte, monaster. 



Figs. 170, 171. 1st spermatocytes, monaster, pole views of the 

 chromosomes. 



Figs. 172 — 175. 1st spermatocytes, monaster; the shape of the 

 chromosomes abnormal in Fig. 174. 



Figs. 176 — 189. 1st spermatocytes, monaster, pole views of the 

 chromosomes. 



Figs. 190 — 196. 1st spermatocytes, successive stages of the meta- 

 kiuesis. In Figs. 190 and 196 both pairs of centrosomes do not lie in 

 the plane of the section. 



Plate 5. 



Figs. 197 — 199. 1st spermatocytes, conclusion of the metakinesis; 

 in Figs. 197 and 199 the whole spindle does not lie in the plane of 



the section. 



