Test discoidal to lenticular, numerous broad and low chambers increasing rapidly in breadth so that the spire increases rapidly in height, coilingplanispiral and incompletely involute, leaving a depressed umbilicus; wall finely agglutinated, imperforate, simple in structure; apertural face high and truncate and may be slightly depressed centrally, aperture a small areal slit in the early stage as seen in thin section, becoming terminal in the expanded and nearly uncoiled later portion.L. Cretaceous (Albian); USA: Texas.

Remarks: Although originally described as having a series of apertural pores, Maync (1972, *2082, p. 356) noted that the septa were compact rather than pierced. Because of the narrowness of the slit aperture, it is not intersected by every section, but a single rela­tively large slit in the septum is apparent in a number of places in good axial sections.