CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 555 
The Cytoplasmic Inclusions of the Germ-Cells. 
PART II. HELIX ASPERSA. 
By 
J. Bronte Gatenby, B.A., 
Exhibitioner of Jesus College, Oxford. 
(Dept, of Physiology.)* 
With Plates 29-34 and 5 Text-figures. 
Table of Contents. 
PAGE 
1. Introductory ..... 556 
•2. Previous Work ..... 556 
3. Technique . . . . . . 562 
4. The Germinal Epithelium .... 564 
5. Cell Generations in the Snail . . 571 
6. Manner of Metamorphosis of an Indifferent Germinal 
Epithelial Cell into a Primary Spermatogonium . 578 
7. Manner of Metamorphosis of an Indifferent Germinal 
Epithelial Cell into an Oogonium . . . 587 
8. The Fate of the Mitochondria and Nebenkern in the Egg 589 
9. Manner of Metamorphosis of an Indifferent Germinal 
Epithelial Cell into a Nurse or Yolk Cell . . 590 
10. Description of the Scheme of the Ovotestis Lumen 
drawn in PI. 29, fig. 1 . . . 591 
11. Discussion under the heads of : 
(a) Nebenkern ..... 594 
(b) Mitochondria . . . .598 
(c) The Determination of Oogonium Spermatogonium 
or Nurse-Cell .... 599 
(d) The Different Male Generations in the Ovotestis . 601 
12. Summary .... 605 
