426 
CHIYOMATSU ISHIKAWA. 
Fig. 2. — A fall-grown ovary viewed from ventral side, showing the germinal 
hand, x 20. 
Fig. 3. — A transverse section of a middle-sized ovary. Drawn with camera 
a and 2 (Carl Zeiss). 
Fig. 4. — Connective-tissue layer of the ovary, treated with acetic acid. 
Camera d d and 4. 
Fig. 5. — External epithelium layer of the ovary. Camera e and 2. 
Fig. 6. — External epithelium layer of the oviduct. Camera e and 2. 
Fig. 7. — A portion of the wall of the vitellogeu viewed from inside, showing 
a small capillary branch. Camera d d and 4. 
Fig. 8. — A transverse section of the ovary wall, showing the blood space. 
Camera d d and 4. 
Fig. 9. — A transverse section of a young ovary of about 014 mm. in cross 
diameter. Camera D d and 4. 
Figs. 10 and 11. — Transverse sections of a larger ovary, passing through 
the oviduct. Camera d d and 4. 
Fig. 12. — Three young eggs from the germogen, showing the growth of 
germinal dots. Camera d d and 2. 
Fig. 13. — A section of a young ovum with developing yolk-spherules. 
Camera d d and 2. 
Fig. 14. — A section of a germinal vesicle, surrounded by a network of 
protoplasm. Camera D d and 2. 
Fig. 15. — Internal epithelium of the oviduct during the breeding season. 
Camera D d and 4. 
Fig. 16. — Primary egg-membrane, showing the polygonal markings. Camera 
d d and 4. 
Figs. 17 — 40. — Magnified 40 diameters. 
Figs. 17, 18, and 19. — Eggs dividing into two equal parts. 
Fig. 20. — First transverse furrow completed. 
Figs. 21, 22, and 23. — First resting stage. 
Fig. 24. — First transverse furrow restored. 
Fig. 25. — First longitudinal furrow appearing. 
Fig. 26. — First longitudinal furrow completed. The egg is divided into 
four equal parts. 
Figs. 27 and 28. — Second resting stage. 
Fig. 29. — First transverse furrow restored. 
Fig. 30. — First longitudinal furrow restored. 
Fig. 31. — Egg divided into eight equal parts by the second longitudinal 
furrow. 
Fig. 32. — Egg divided into sixteen equal parts by the second set of 
transverse furrows. 
Fig. 33. — Egg divided into thirty-two parts by the third set of longitudinal 
furrows. 
