Shell up to 14.0mm in length, elongate-ovate, teleoconch of 4-5 whorls, protoconch of 3-31 finely carinate embryonic whorls, protoconch occasionally imbedded in callus-shield; sculptured with thick and broad axial ribs which become thinner and more numerous on body whorl; spiral sculpture of bisecting spiral threads which render axial ribs granulose, dorsal area of body whorl with a hump, deeper subsutural groove separating sutural nodules. Aperture narrow, outer lip and base of columella denticulate, columellar shield large, glossy, and occasionally reaching apex, siphonal and anal canals distinct. White to cream in colour, spire whorls with a single dark green subsutural band, body whorl with 1-3 bands, columellar shield white but frequently flushed with orange above parietal wall, in- terior of aperture banded with purple-brown, occasional specimens uniformly cream in colour. Oper- culum brown and serrate at the margins.

TYPE LOCALITY. Burias I, Philippines, 11 m. DISTRIBUTION. From East Africa to the Andaman Is, Philippines and the Samoa Is. Type specimens. Three syntypes of N.callospira (A. Adams) are in the British Museum (N.H.), London, No. 197319, and the 11.6 mm long syntype is here selected as the lectotype (pl.5, fig. 1). Material examined. EAST AFRICA: Zanzibar (USNM); MADAGASCAR: Tulear (SMOM); REUNION IS: St. Giles (coll.Martin); ANDAMAN IS: (ZMC; ZSI; USNM); Port Blair (NM); INDONESIA: Standing I, Mentawai I; Morotai, Halmahera (both USNM); Kupang, W. Timor; Sanur Beach, Bali; Mali, Alor I, Timor; Pantai Kelapa Lima, 5 km N. of Kupang, W. Timor; Nusa Tenggara, Timor (all coll. McCausland); PHILIPPINES: Torrojos, Marinduque I (USNM); PAPUA NEW GUINEA: Port Moresby; Panab I, Madang; Nui I, Madang Harbour (all AMS); Rabaul, New Britain (coll. Prior); Raluana village, E. New Britain, 24 m (coll. Parkinson); Laing I, Hansa Bay (coll. Tursch); AUSTRALIA: Michaelmas Cay, off Cairns, Qld. (AMS); SOLOMON IS: Kieta, Bougainville (coll. Whitehead); Haroro; Komimbo Bay and Marau Sound, Guadalcanal; Jetty reef, Guadalcanal (all Auckland Univ.); Ugi I (USNM); Hetabeta I, Santa Isabel group (coll. Bratcher); Gihili, Bougain- ville (AMS); NEW HEBRIDES: Tuki Tuki Pt., Efate I; Port Havannah, N. Efate I; Malapoa Pt., Efate I; (all coll. Eker); Surunda, Espiritu Santo (coll. Coles); Undine Bay, Efate I (coll. Bratcher); LOYALTY IS: Lifu I (AMS; AIM; USNM); NEW CALEDONIA: (AMS); TONGA IS: Va'vau (SDNHM); SAMOA IS: Apia (coll. Powell). In specimens from the Andaman Is, the callus-shield is smaller and frequently reaches only the body whorl suture. In the New Hebrides, the species is frequently found in colonies.