RZEHAKINA Cushman, 1927
Type species: Silicina epigona Rzehak, 1895 (*2682), p. 214; OD.
Rzehakina Cushman, 1927 (*742), p. 31.
Test flattened ovate, planispirally coiled, with narrow elongate chambers a half coil in length, commonly partially overlapping earlier coils to result in a much thickened wall at the center of the sides, as is readily visible in transverse section; wall finely agglutinated on an organic base, insoluble in acid; aperture terminal, rounded, without a tooth. Cretaceous to Paleocene; cosmopolitan.