Diagnosis.—Deep groove of relatively constant width that takes various sinuous forms.

Description.—Deep grooves (2 mm maximum) of relatively constant width in every specimen (between 1–2 mm) that de− scribe various gentle undulations to tighter loops, although in the latter the opposite parts of the figure never parallel. The grooves normally begin and end at the edge of the calyx and sometimes show one or two short branches. The trace is often very symmetrical from one side of the corallite to the other in flabellate forms. In them, the central, lower part of the figure surrounds the corallite and the two extremes run more or less vertically to the calyx (Fig. 2). Remarks.—This trace appears in