Cells elongate, external side nearly straight, vibraculum sublateral, very prominent.
Opening of cell broad oval, pointed below; three short indistinct spines above; vibraculum large, sinus deep.
vibraculum, vī-brak′ū-lum, n. one of the long whip-like appendages of the cells of some Polyzoa:—pl.
Character: (B.) cells rhomboidal, sinuated on the outer side for the lodgment of a vibraculum.