244 



Dictyohinesis in Germ Cells. 



rig. 5. — Early telophase of primary spermatocyte. The Golgi elements are scattered 

 irregulaily. 



Fig. 6. — Late telophase of second spermatocyte division, showing the two separated 

 groups of chromosomes (CH), and the dispersed dictyosomes (GA). 



Fig. 7. — Late prophase of secondary spermatocyte division, showing the two archo- 

 plasmic masses with adherent Golgi apparatus (GA) at opposite poles of the 

 cell. 



Fig. 8. — Spermatid with reconstructed compact form of the Golgi apparatus (GA). 

 Fig. 9. — Spermatozoon with the Golgi apparatus before becoming sloughed off. 



Figs. 10 and 11 were drawn from Cajal preparations of the testis of Stenohothrus 

 viridvXvs stained with fuchsin. 



Fig. 10. — Spermatocyte, showing the archoplasm before division, and the numerous 



scattered Golgi elements (GA). 

 Fig. 11. — Late telophase of first spermatocyte division, showing the elements of the Golgi 



apparatus (GA) fairly equally distributed in the secondary spermatocytes. 



Plate 2. 



Figs. 12 to 18 were drawn fi-om Weigl-Kopsch-Altmann preparations of the testis of 

 Cavia. Mitochondria are shown only in fig. 17, but are present at all stages. 



Fig. 12. — SpeiTnatocyte showing the curious vacuoles (W) associated with the Golgi 

 apparatus. 



Fig. 13. — Pi'imary spermatocyte at late prophase with the Golgi apparatus begianing to 



divide and a single chromatoid body (CB). 

 Fig. 14. — Later stage of the prophase, the Golgi apparatus is in process of fission, and 



the chromatoid body (C.B) has just divided. 

 Fig. 15. — Primary spermatocyte with the apparatus (GA) divided into two parts. The 



nuclear membrane has just broken down, and there are two chromatoid 



bodies present. 



Fig. 16. — Two forms of the Golgi apparatus, as found in the spermatocytes of Cavia. 



In (a) it consists of a number of semi-lunar dictyosomes attached peripherally 

 to the archoplasm. In (6) it is much more darkly impregnated with the 

 osmium tetroxide and a number of frothings appear on its surface. 



Fig. 17. — Metaphase of first spermatocyte division. The Golgi elements (GA) are 

 scattered unevenly in the cytoplasm, the chromatoid bodies are seen at CB, 

 and granular mitochondria (M) are fairly evenly distributed throughout the 

 cytoplasm. 



Fig. 18. — Telophase of second spermatocyte division, showing the Golgi elements (GA) 

 moving towards the archoplasm, and the chromatoid bodies at CB. 



Figs. 19 and 20 show the spermatocytes of Molluscs. The former is from a Flemming- 

 without-acetic preparation, stained by iron alum hfematoxylin : and the latter from a 

 preparation by the Kopsch method. 



Fig. 19. — Primary spennatocyte of Helix aspersa at the diakinetic stage. The Golgi 

 apparatas has just divided, and the two archoplasmic spheres are beginning 

 to separate. Filamentous mitochondria (M) are seen scattered throughout 

 the cytoplasm. 



Fig. 20. — Metaphase of the first spermatocyte division of Limncea stagnalis, showing the 

 Golgi elements (GA) attached peripherall}- upon the asters at both poles of 

 the nuclear spindle. 



