Gonocalyx :: Gonocalyx (n.) The bell of a sessile gonozooid.
Nectocalyx :: Nectocalyx (n.) The swimming bell or umbrella of a jellyfish of medusa.
Nectocalyx :: Nectocalyx (n.) One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ..
Nematocalyx :: Nematocalyx (n.) One of a peculiar kind of cups, or calicles, found upon hydroids of the family Plumularidae. They contain nematocysts. See Plumularia..