The non-sexua 1 reproduction takes the form of fission, budding or sporogony, the details of which are described below.
If the germ-cells are undifferentiated, the offspring may arise from many cells or from a single cell; the first type is (4) germinal budding, the second is (5) sporogony.
From these facts,, and from those of the sporogony, to be described below, we may regard budding to this type as taking place from the germinal epithelium rather than from ordinary ectoderm.
Whether sporogony occurs also in the polyp or not remains to be proved.
It is in these parasitic forms that we meet with the method of reproduction by sporogony described above.