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, Woodâs 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 of Morphology – Wiley
Published: Sep 1, 1894
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