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The ontogeny of interstitial cells in Pennaria tiarella

✍ Scribed by Robert G. Summers; Julian F. Haynes

Publisher
John Wiley and Sons
Year
1969
Tongue
English
Weight
524 KB
Volume
129
Category
Article
ISSN
0362-2525

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✦ Synopsis

The interstitial cells of Pennaria tiarella differentiate exclusively froin the central endodcrm of the planula. Shortly after thcir appearance, most of the interstitial cells become cnidoblasts. Subsequently, as the larva transforms into a polyp, both cnidoblasts and interstitial cells migrate from the endoderm, through endoblast and mesoglea, into the ectoderm. It is suggested that some interstitial cells remain in the endoderm and differentiate into the gland and mucous cells of the polyp gastroderm.

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## ONE PLATE (EIGHT FIGURES) ' I am indebted to Hon. J o h n R. Ga'rdner, Acting Commissioner of Fisheries, for the use of space in the Fisheries Laboratory at Beaufort, North Carolina, and to Dr. H. F. Prytherch, Director of the laboratory, for aid. A fund from the General Education Board made po