Shell medium in size, reaching about 10mm. in length; dull white, probably due to its existence in the mud, highly conical; the height being about 70% of the shell length; anterior slope gently convex and posterior slope concave immediately below the apex, then extending downward in a straight line to the margin; aperture elliptical in sharpe; apical whorls small, smooth and polished, hooked down posteriorly and situated at the posterior end; anal fasciole long and narrow; fissure narrow, shorter than one-third of the length of the anterior slope; sculpture consists of about 15 primary radial cords and at a short distance from the apex, secondary ribs appear between each two of the primary ribs; forming nodules on the point of intersection, dividing the spaces between ribs into deeply excavated square pits, giving the shell a lattice-like appearance; margin crenulated by the terminations of the ribs. Height 6.7 mm., length of aperture 9.5 mm., breadth of aperture 7.0 mm. (the largest paratype specimen collected by Mr. Akibumi TERAMACHI).

Emarginula adamsiana SOWERBY somewhat relates to this new species in its shape, but has the sculpture on the shell decidedly coarser than in the latter. Emarginula chorides DALL from off Gwajajima, south of Kyushu, is another allied one, but it has a larger shell with the sculpture differing from that of this new species.

Japan. Type locality: Tosa Bay, Shikoku (about 70 fathoms).