Note 12 — Chapter II · THE METEORS OF THE SEA.
Reading edition
Page 16. The term zooids is applied to the mass of tentacles and other fleshy parts of the Physophoræ. The long, extensile feelers are for prehension; others aid in locomotion, and some are reproductive; others are feeders for the entire colony. Thus it will be seen that these creatures are in a sense compound animals.