(Gr. zeugle, a yoke; odous, a tooth). An extinct family of Cetaceans, in which the molar teeth are two-fanged, and look as if composed of two parts united by a neck.


(Gr. zoon, animal; oikos, house). The "cell" or chamber in which the polypide of a Polyzoon is contained.


(Gr. zoon, animal; and eidos, like). The more or less completely independent organisms, produced by gemmation or fission, whether these remain attached to one another or are detached and set free.


(Gr. zoon, animal; phuton, plant). Loosely applied to many plantlike animals, such as Sponges, Corals, Sea-anemones, Sea-mats, etc.


(Gr. zoon, animal; and spora, seed). The ciliated locomotive germs of some of the lowest forms of plants (Protophyta).