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Biol Bull 71: 46-58. (August 1936)
© 1936 Marine Biological Laboratory
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THE MEMBRANES AND GERMINAL VESICLE OF THE EGG OF SABELLARIA VULGARIS

A. J. WATERMAN 1

1 From the Thompson Biological Laboratory, Williams College, and the Marine Biological Laboratory, Woods Hole

The vitelline membrane of the egg of Sabellaria vulgaris is a preformed structure whose elevation is stimulated by exposure to sea water. During and after its elevation a second or hyalin plasma membrane forms. During the first hour after shedding these membranes undergo certain physical alterations which probably are responsible in part for the very low percentage of successful sperm penetration. These alterations are described as well as the effect of a non-electrolyte solution and various salts on membrane elevation.

The behavior of the free germinal vesicle of this egg in sea water, hypo- and hypertonic solutions is also described. The vesicle, freed of any of the other egg materials, can be secured within about eight minutes after shedding, by placing the eggs in distilled water. The penetration of certain vital dyes and indicators is discussed and also the information these reveal of the internal pH of the free vesicle.






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Copyright © 1936 by the Marine Biological Laboratory.