Emarginula undulata is characterized by 1) mod-erately elevated, conical thin shell attaining 10 mm in length, 2) apex strongly recurved, nearly reaching the posterior margin, 3) protoconch emarginuliniform, 4) basal outline oblong-ovate, 5) base slightly concave in side view, 6) anal slit relatively long, 7) selenizone raised, bordered by flanges, 8) sculpture of 24 rounded radial ribs with some finer intermediate ones and 9) intritacalx pits concentrically elongated, arranged in regular rows, both concentric and radial; smooth strips intercalated with rows of pits create a dense concen¬tric sculpture.

DISTRIBUTION AND HABITAT. Emarginula undulata was hitherto known from the Gulf of Oman to South Africa; this is the first record in Southeast Asian waters. The species was recovered primarily from coarse sand, shell or sponge rubble at depths of 60-420 m (HERBERT & KILBURN, 1986).
FOSSIL RECORDS. None recorded.