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Biol Bull 108: 18-20. (February 1955)
© 1955 Marine Biological Laboratory
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A NOTE CONCERNING THE DISTRIBUTION OF POLYSACCHARIDES IN THE EARLY DEVELOPMENT OF THE HYDROMEDUSAN PHIALIDIUM GREGARIUM

JOHN TYLER BONNER 1

1 Friday Harbor Laboratories, University of Washington and Princeton University, Princeton, New Jersey

The distribution of non-starch polysaccharides was studied from egg to attached polyp in the hydromedusan Phialidium gregarium and it was found that the polysaccharides were fairly evenly distributed throughout the development except in the late planula. There a number of gland cells richly supplied with polysaccharide appear in the ectoderm and show a gradient—sparse in the posterior end and dense in the anterior attachment region. These cells are apparently concerned with fixation, for after the larva has attached and secretes a hard chitinous covering, these ectodermal concentrations of polysaccharide are no longer visible.






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Copyright © 1955 by the Marine Biological Laboratory.