SPIROPHTHALMIDIUM Cushman, 1927
Type species: Spiroloculina acutimargo Brady, 1884 (*344), p. 154; OD.
Spiropthalmidium Cushman. 1927 (*742), p. 37, 39 (nom. imperf.).
Spirophthalmidium Paalzow, 1932 (*2323), p. 99 (nom. corr.).
Test free, flattened, ovate to fusiform, periphery carinate, globular proloculus followed by undivided cornuspirine enrolled second chamber, and then by two chambers per whorl, planispiral, the chamber lumen narrow, that of successive chambers separated by plate-like shell material like that of the peripheral keel; wall calcareous, imperforate, porcelaneous; aperture rounded to ovate, at the open end of the final chamber. Holocene; cosmopolitan.