Ciliobrachiata Anthozoa Nudibrachiata
(with ciliated arms). (flower animals). (with naked arms).
Class—Entozoa (internal animals).
Cœlelmintha Sterelmintha
(hollow worms). (solid worms).
Class—Infusoria (infusorial animalcules).
Rotifera Polygastrica
(wheel animalcules). (with many digestive sacs).