from The Century Dictionary.
- noun A small genus of widely distributed phæosporous algæ, of the order Dictyotaceæ, having a more or less fan-shaped frond obscurely marked with concentric zones, and roundish or linear sori formed beneath the cuticle of the frond.
- noun One of two primary groups (the other being Discoidea) into which Huxley divided the deciduate Mammalia, consisting of those Deciduata which have a zonary placenta; the Zonoplacentalia.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) A division of Mammalia in which the placenta is zonelike.
Sorry, no etymologies found.
They are the eggs of the Volucella, or bumblebee fly (Volucella zonaria, LIN.)