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Biol Bull 69: 298-304. (October 1935)
© 1935 Marine Biological Laboratory
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SOME SURFACE PHENOMENA IN THE FERTILIZED SEA URCHIN EGG AS INFLUENCED BY CENTRIFUGAL FORCE

ETHEL BROWNE HARVEY 1

1 From the Stazione Zoologica, Naples, and the Biological Laboratory, Princeton University

1. Some normal Parechinus eggs become crenate during the streak stage. When centrifuged at this stage, the cells with fertilization membranes become folded and those without fertilization membranes become crinkled near the centrifugal pole.

2. When centrifuged in the 2-cell stage, the two blastomeres are separated owing to the destruction of the ectoplasmic layer. They may later be drawn together by fine strands, forming a single blastula; or they may remain separate forming twin blastulæ.






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Copyright © 1935 by the Marine Biological Laboratory.