The Cytoplasmic Inclusions of the Germ-Cells 

 Part X. The Gametogenesis of Saccocirrus.^ 



By 

 J. Bronte Gatenby, B.A., D.Phil. (Oxoii.), D.Sc. (Lond.), 



Professor of Zoology and Comparative Anatomy, University of Dublin. 



With Plates 1-4 and 1 Text-figure. 



Contents. 



1. Introduction ..... 



2. Previous Work ..... 



3. Technique and Material . . . 



4. Spermatogenesis .... 



(ff) The Spermatogonium of Saccocirrus 



{h) The Spermatocyte 



(c) The Spermatocyte Divisions . 



(f/) The Newly-formed Spermatid 



(e) Spermateleosis .... 



(/) The Fate of the Golgi Apparatus during Spermateleosis 



5. The Fate of the Tail of the Spermatozoon during Entry 



6. The Oogenesis of Saccocirrus . 



(a) The Nucleolus during Oogenesis 

 (6) The Mitochondria 



(c) The Golgi Apparatus . 



(d) The Formation of Fatty Yolk 

 {e) Chromophility during Oogenesis 

 (/) On Peri-nuclear Activity 



7. Some Chromophility Reactions of the Four Categories of 



Cytoplasmic Granules ..... 



8. Centrifuge Experiment on the Ovarian Oocyte 



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^ The materials used for this research were purchased by a Government 

 Grant of the Royal Society, for which thanks are expressed, 

 NO. 261 B 



