01 n. One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian.
pl.
Hydrothecæ, Hydrothecas ((#))
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1.
One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian.(Zool.) See: Hydroidea, Campanularian