Test large, compressed, planispirally enrolled in the early stage, chambers rapidly increas­ing in breadth but very little in height, so that the test becomes flabelliform, later chambers cyclical and the test discoidal, interior of cham­bers simple and undivided; wall calcareous, porcelaneous, surface may have fine longitu­dinal striae in the early coiled stage that are radial in the discoidal adult; aperture a row of circular perforations on the periphery. U. Cre­taceous (Senonian); France.