capitulum

Capitulum globosum, floridum magnitudine pruni minoris, fructiferum pomum parvum aequans.

Cirripedia having a carapace, consisting either of a capitulum on a peduncle, or of an operculated shell with a basis.

Cirripedia quibus pro carapace est aut capitulum pedunculatum, aut testa operculata cum basi.

Capitulum sine valvis; apertur ampl; pedunculus fimbriatus, sub-globosus, infossus.

I believe I saw in one specimen, most delicate transverse muscular fibres round the lower part of the elongated capitulum.