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Quarterly Journal of Microscopical Science, Vol s2-73, 7-24, Copyright © 1929 by Company of Biologists

Memoirs: Studies in the Origin of Yolk

III. Oogenesis of the Firefly, Luciola Gorhami

VISHWA NATH M.Sc., Ph.D. (Cantab.)1 and DEV RAJ MEHTA M.Sc.1

1 Department of Zoology, Government College, University of the Punjab, Lahore

1. Both fresh and fixed eggs have been studied.

2. A remarkable phenomenon has been discovered in Luciola: that the Golgi elements which are in the form of vacuoles contain free fat even in the undifferentiated germ-cells.

3. The Golgi vacuoles containing free fat swell up in the oocytes and give rise to fatty yolk-vacuoles.

4. In the youngest oocyte the nucleolus is amphophil, consisting of deeply basophil round bodies, the nucleoli, embedded in an acidophil ground-substance.

5. The plastin ground-substance of the nucleolus grows and entirely fills up the whole space within the nuclear membrane.

6. The nucleoli multiply rapidly, migrate into the cytoplasm, and directly give rise to albuminous yolk.

7. Nucleolar budding lasts throughout oogenesis.

8. The mitochondria are granular and remain so throughout oogenesis.






© The Company of Biologists Ltd 1929