Schematic constructions of calicular features, and sympodial as well as monopodial forms of colonies.

A, Calicular view, showing the two opposite directive septa, the greater calicular diameter (GCD), and the lesser calicular diameter (LCD). Numbers indicate the cycles of septa; the first cycle of septa is circled. The two directive septa are indicated by black triangles, whereas the four remaining septa are shown by white triangles. B, Sympodial form of colony. TH indicates the corallum height, and LH the lateral corallum length. Note that the colony does not possess an axial corallite. C, Monopodial form of colony. D, Budding site of monopodial colony form, where offsets generally occur in some of the lateral primary septa.