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- proper noun A taxonomic
classwithin the subphylumRadiozoa — including numerous minute marinespecies. The skeleton is composed of silica, and is often very elegant in form and sculpture. Many have been found in the fossil state..
from Wiktionary, Creative Commons Attribution/Share-Alike License
With regard to organisms, however, the wonderful Acanthometræ and the Polycystina may be mentioned as presenting complexities of form which can hardly be thought to be due to other than _internal_ causes.
No power on earth can make these little urns of the _Polycystina_ except