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One of the radial segments composing the body of one of the Coelenterata.

Huxley, who compared the serous and mucous layers of Pander with the ectoderm and endoderm of the Coelenterata.

The latter by progressive modification gave rise to all the Coelenterata; the former to all other animals.

Following out this curious theory, Dohrn came to contest the general belief that the Coelenterata and Worms are "lower animals"; he even declared that the unicellular Protozoa were degenerate Coelenterata.

He suggests at once that "Hydrozoa" and "Actinozoa," in his list, should be dealt with by the writer of the article "Coelenterata."