Which protist possesses two flagella one lies longitudinal and other transversely?

Most of them have two flagella, one lies longitudinally and the other transversely in a furrow between the wall plates. Here we are talking about

Which possess flagella ?

Is it possible to have a wave which is neither longitudinal nor transverse ?

Which one possesses striated muscles

Whirling Whips are protists which possess two flagella that beat