264 THE ENZYME TREATMENT OF CANCER
As
the table shows, the sponges and Hydra, like the corals (Anthozoa), are
forms in which, as in Fucus among plants, the sexual generation is not
represented by anything, unless by eggs and sperms; while in the mammals the asexual
generation, which makes so brave a show in the Hydrozoa, etc., has become
reduced to the almost structureless trophoblast.