Teinostoma sp. cf. sulcata (A. Adams, 1850 A). Height, 1.2 mm; diameter, 4 mm. Shell: depressed; umbilicate; with fine spiral lines; white. Spire: protoconch of one and one-half slightly smooth, elevated whorls; teleoconch of two and one-half rounded whorls, the last whorl inflated and the periphery rounded. Sculpture: numerous fine spiral lines visible on all but the early whorls, base smooth. Aperture: subcircular; peristome entire; umbilicus deep and with three or four bars of callus. Color: white.
These shells are rarely found in beach drift but nothing is known of the habits of the living animals.
T. sulcata was described from the Philippine Islands.