Shell is rather small, white, solid, depressed but a little inflated at the apical portion, elongated ellipsoidal in shape, broadly rounded at the posterior margin and slightly narrowing toward the round anterior margin and both lateral sides are almost parallel. Apex is situated at the posterior third and is small, turning backward. Anterior slope is weakly convex and the posterior nearly straight. Nuclear whorls are minute but smooth. Fasciole runs from the apex to the anterior margin, terminating a narrow and deep slit, its length being one third that of the anterior slope, provided with elevated arched transverse lamellae less numerous than the growth lamellae. Sculpture consists of about 30 primary ribs, between each two of which secondary rib usually appears, radiating from the apex. These ribs are crossed by the concentric growth ribs forming small nodules where they intersect, resulting deep square pits between them. Margin is crenulated by the terminations of the radial ribs. Height 2.5 mm., length 10.7 mm. and breadth 5.4 mm.
Type locality : Ankyaba, Kakeromajima, an isle near Amami Oshima.
Remarks: This species is easily distinguished from Emarginella eximia (A. Adams) in having the closely-set sculpture on the surface of the elongated shell.

Described from Japan, in the literature reported from Korea and Vietnam. In the Philippines found on Balicasag Island, Olango Island, Mactan Island, Calangaman Island, Leyte and Sumilon Island. Recorded from 10 to 200 m deep. Most shells were found between 10 and 20 m deep, so the very deep records may be from material that was swept or falling to greater depths. 2.2 to 10.7 mm.