We learn also that it was permanently covered, and it was probably used for musical entertainments, but in the case of the larger theatre also the arrangements for the occasional extension of an awning (velarium) over the whole are distinctly found.
The medusoids have no true velum; in some cases a structure more or less resembling this organ, termed a velarium, is present, permeated by endodermal canals.
4) a structure is found termed a velarium (Ve), which is a flap hanging down from the margin of the umbrella, and which consists of a fold of the subumbral ectoderm containing endodermal canals.
Frenum of the velarium.
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