“The individuals of the bryozoan colony, called zooids, are about
one-sixteenth of an inch in length and consist of little more than a
digestive system encased within a compartment of leathery or calcified
skeleton. The zooids feed through a trapdoor that opens to the outside.
By thrusting feathery tentacles into the current, they sweep tiny
plants and animals into their open mouths with a quick, flicking motion.” (Winston 1990:70)