from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun A taxonomic
genuswithin the family Porpitidae— the blue buttons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
In his famous monograph of the Radiolarians, Haeckel suggests that they are probably secreting cells or digestive glands in the simplest form, and compares them to the liver-cells of Amphioxus, and the "liver-cells" described by Vogt in _Velella_ and _Porpita_.
_Porpita_: it has the flat form of the latter, but is provided with a sail, which it can draw in at will.
_Porpita glandifera_, and a new species of globular form; a _Velella_; two new species of Acalephes, of the same family as the _Diphyes_; and further _Pelagia panopyra_, and two other very small species.