Hexacromyida = Cubosphærida quadruplicia = Tetrasphærida hexacantha.
Hexacromyum = Onion with six rays; ἕξα, κρόμυον.
Hexacaryida = Cubosphærida multiplicia = Polysphærida hexacantha.
Cubosphæra = Sphere with three axes of a cubus; κῦβος, σφαῖρα.
Hexacaryum = Nut with six spines; ἕξα, κάρυον.