Shell c. 12.0 mm in length, moderately light in weight, elongate-ovate, teleoconch of 44-5½ angulate whorls, protoconch of 24-3 embryonic whorls; sculptured with thin, angulate axial ribs which number from 12-16 on the penultimate and from 13-16 on the body whorl, sutures of spire whorls with a row of prominent, slightly echinate nodules, suture of body whorl and occasionally penultimate whorl with a double row of nodules. Spiral sculpture consists of spiral threads which number from 3-4 on the penultimate and from 8-10 on the body whorl, siphonal fasciole with an angulate cord. Aperture narrow, outer lip narrowly variced and with 8-10 denticles, columella with 3-5 denticles and an oblique fold anteriorly, columellar callus large and reaching body whorl suture, slightly thinning above parietal wall. Creamy-white to straw-yellow in colour, body whorl with 2-3 narrow brown bands on body whorl, callus-shield white.

TYPE LOCALITY. Catbalonga, Samar I, Philippines (bellulus); Dumaguete, Negros I, Philippines (nana). DISTRIBUTION. From India to Indonesia and the Philippines. In sand, usually subtidal, to a depth of 100 m. Type specimens. Two syntypes of N. bellulus (A. Adams) are in the British Museum (N.H.), London, No.197316, and the 10.0 mm long syntype is here selected as the lectotype (Pl.3, fig. 13). Two syn- types of Nassa nana A. Adams, are in the same Institution, No.1973133, and the 8.2 mm long specimen is here designated as the lectotype (Pl.4, fig.2). Material examined. INDIA: Pondicherry (ZSI); MALAYSIA: Pulau Langkawi, Kedah (coll.McCausland); THAILAND: Koh Kut (ZMC); PHILIPPINES: Samar I and Negros I (BMNH); Sth. of Puerto Princessa, Palawan group (coll.Norton). The species is similar to N.leptospirus A. Adams, but differs in features of angulate whorls, multispiral protoconch, double row of sutural nodules on last 2 whorls and wider spaced spiral threads.