Sometimes there are small nematocyst batteries in the ectoderm of the column. The later ones are arranged either cyclically or bilaterally, and the partners of a pair may be equal or unequal.
All stronger mesenteries fertile.
References Carlgren, O. 1949. A Survey of the Ptychodactiaria, Corallimorpharia and Actiniaria. Svenska Vetenskapsakadamiens Handlingar, series 4, volume 1, number 1. The information provided on this page is based on Oscar Carlgren's 1949 catalog. Copyright 1949 Swedish Academy of Sciences.