I, The horny cup or hydrotheca of the hydriform persons; 1, medusiform person springing from m, a modified hydriform person (blastostyle); n, the horny case or gonangium enclosing the blastostyle and its buds.
B, The long manubrium, bearing medusiform buds; a, mouth.
Ocelli are seen at the base of the tentacles, and also (as an exception) groups of medusiform buds.
A, A hydriform person giving rise to medusiform person by budding from th margin of the disk; B, free swimming medusa (Steenstrupia of Forbes) detached from the same, with manubrial genitali.
I, Generative medusiform person.