The body is ovoid to elongate, and uniformly ciliated, with a single macronucleus and a partial hypostomial frange ( " synhymenium " ) running from the left side of the cell to the oral aperture.
2.
These he called Coelentera, and showed that they had no special affinity with echinoderms, polyzoa, etc . He further divided the Coelentera into a group Hydrozoa, in which the sexually produced embryos were usually set free from the surface of the body, and a group Actinozoa, in which the embryos are detached from the interior of the body and escape generally by the oral aperture.
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