- Diagrams illustrating the successive stages in the development of the cyclosystems of the Stylasteridae.
Irregular in form; pores scattered irregularly or in cyclosystems, without styles, with transverse tabulae; free medusae.
Stylaster has cyclosystems. In Allopora the cyclostems resemble the calyces of Anthozoan corals.
- There cyclosystems placed at can be no doubt that the forms comprised intervals on the in this order bear a close relationship to the branches, each with a Hydroidea, especially the sub-order Gymnocentral gastropore and blastea, with which they should perhaps be zone of slit-like dac classed in a natural classification.