Preliminary note on the maturation and fertilization of the egg of allolobophora foetida

Preliminary note on the maturation and fertilization of the egg of allolobophora foetida the results obtained from the study of more than two hundred eggs, taken from the cocoons of Allolobophora foetida, and supplemented by the study of the earlier stages in the ovary. T h e work was begun in the summer of 1893 a t the Marine Biological Laboratory, Wood’s Holl, Mass. I express my grateful acknowledgments to the Director, Dr. Whitman, for his valuable assistance, and also to Dr. Conklin, a member of the staff. T h e deposition of the cocoons, which I have been so fortunate as t o observe several times, will be fully described in a future paper. T h e shape of the average egg is shown in Fig. I . T h e size at this stage of development varies from .IO mm to . I S mm, and the membrane adheres much closer to the egg than is the case after t h e polar bodies are formed, When the cocoon is first laid neither polar body has been constricted off; the first maturation spindle is formed, but still occupies the centre of the egg. A s it approaches t h e periphery it occupies positions varying from perfectly radial to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Morphology Wiley

Preliminary note on the maturation and fertilization of the egg of allolobophora foetida

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Publisher
Wiley
Copyright
Copyright © 1894 Wiley‐Liss, Inc.
ISSN
0362-2525
eISSN
1097-4687
D.O.I.
10.1002/jmor.1050090308
Publisher site
See Article on Publisher Site

Abstract

the results obtained from the study of more than two hundred eggs, taken from the cocoons of Allolobophora foetida, and supplemented by the study of the earlier stages in the ovary. T h e work was begun in the summer of 1893 a t the Marine Biological Laboratory, Wood’s Holl, Mass. I express my grateful acknowledgments to the Director, Dr. Whitman, for his valuable assistance, and also to Dr. Conklin, a member of the staff. T h e deposition of the cocoons, which I have been so fortunate as t o observe several times, will be fully described in a future paper. T h e shape of the average egg is shown in Fig. I . T h e size at this stage of development varies from .IO mm to . I S mm, and the membrane adheres much closer to the egg than is the case after t h e polar bodies are formed, When the cocoon is first laid neither polar body has been constricted off; the first maturation spindle is formed, but still occupies the centre of the egg. A s it approaches t h e periphery it occupies positions varying from perfectly radial to

Journal

Journal of MorphologyWiley

Published: Sep 1, 1894

References

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