As Nassarius caelatus torresianus:
Shell small, solid, ovate. Whorls six, half of which compose the protoconch. Colour pale buff with a broad orange zone on the upper half of the whorl, and another on the base, white beneath the suture. Sculpture: radial riblets are disposed at the rate of about eighteen to a whorl and are crowded towards the aperture, each expands posteriorly to form a subsutural bead-row. Their interstices are crossed by broken spiral furrows at the rate of sixteen to a whorl. Aperture slightly ascending, varix solid and projecting, outer lip with four interior denticles, inner with a small tubercle at either end. Length, 5; breadth, 2,5 mm.
Hab.—Dredged in 12 fathoms, in Torres Straits, by Mr. J. Brazier.

The Thai specimens are characterized by 1) elongate-ovate shell attaining 7 mm in height, 2) protoconch low-conical of 3 smooth whorls, the last finely carinate, 3) moderately elevated, cyrtoconoid spire, 4) aperture oval, 5) outer lip broadly swollen, with 5-6 denticles on its inner side, 6) columellar lip callused, bearing a parietal ridge and 3 stout abapical denticles, 7) sculpture of strong collabral ribs and low spirals in the intervening furrows; a distinct groove bounds the noded subsutural band; 22 ribs are present on the body whorl; 5-6 spiral cords occur over the base; a faint, dense axial striation is noted all over. The present species resembles the smaller Nassarius celebensis (Schepman, 1907) in several respects, but has a somewhat slenderer shell and less coarse axi-als.
DISTRIBUTION AND HABITAT. Nassarius idyllius is distributed in the Indo-Pacific, from the Persian Gulf to the Philippines and Fiji Islands. According to CERNOHORSKY (1984), it occurs in coral sand, clay, mud and shell debris, in the 5-320 m bathy-metric range.
FOSSIL RECORDS. Pliocene and Quaternary of In-donesia.

Nassarius (Zeuxis) idyllius (Melvill & Standen, 1901) Shell up to 12.0 mm in length but frequently smaller, elongate-ovate, conical, teleoconch of 4½-5% convex whorls, protoconch of 24-34 glassy, finely carinate embryonic whorls; sculptured with moderately numerous, slender axial riblets which number from 16-24 on the body whorl and from 20-26 on the penultimate whorl; spiral sculpture consists of fine spiral striae, c. 5-6 on the penultimate and 8-10 on the body whorl followed by 5-6 nodulose cords, striae sometimes override axials giving them a slightly nodulose appearance, sutural nodules separated by a deeper subsutural groove; in some individuals the subsutural groove is very shallow. Aperture moderately small, outer lip thickened and variced and with 5-8 denticles within, columellar callus narrow, bordered and minutely denticulate, siphonal notch prominent. Usually uniformly cream to straw-yellow in colour, some specimens with a brown central band on body whorl, columellar callus and aperture white. TYPE LOCALITY. Gulf of Oman, 24°55'N & 57°59'E, 68 m (idyllius); S.E. of Akik Seghir, Red Sea, 17°26'N & 39°19'E, 332 m (munda); Flores Sea, Indonesia, 8°27'S & 122°56.5'E, 247 m (ovoidea Schepman); Torres Strait, N. Australia, 22 m (torresiana); Toi Oesapi Soka, Timor, Pliocene of In- donesia (schepmani); Tjidilem, Sth. Bantam, Java, Pliocene of Indonesia (dilemensis). DISTRIBUTION. From the Persian Gulf to Madagascar, the Philippines and the Fiji Is. In coral sand, clay, mud and shell-debris, subtidal, from 5-320 m. Type specimens. Two syntypes of N.idyllius (Melvill & Standen) are in the British Museum (N.H.), London, No.1901.12.9.158-159, and the adult specimen measuring length 11.0 mm, width 6.0 mm, is here selected as the lectotype (pl.32, figs.8,9). Syntypes of Nassa ovoidea Schepman, are in the Zoological Museum, University of Amsterdam, and the specimen measuring length 6.8 mm, width 3.9 mm, is here designated as the lectotype (pl.32, fig.11). Two syntypes of N.torresiana Hedley, are in the Australian Museum, Sydney, No.C-8072, and the specimen measuring length 5.3 mm, width 2.9 mm, is here selected as the lectotype (pl.32, fig. 12). The type of dilemensis Oostingh, is probably in the Bandoeng Museum, Indonesia, the whereabouts of the type of schepmani Koperberg, are unknown to me, and the types of N.munda Sturany are missing from the collection of the Natural History Museum, Vienna (Dr. E. Wawra, in litt.). Material examined. PERSIAN GULF: 3 km W. of Ayanat, 27°43'N & 52°08'E, 7 m; E.S.E. of Bustani, Iran, 27°05'N & 53°02'E, 5-9 m (both ZMC); MADAGASCAR: Tulear (SMOM); ANDAMAN IS: (ZSI); INDONESIA: Macassar Str., 1°25'S & 117°05'E, 50 m; S. of Bali, 8°26'S & 114°29′E, 70 m (both ZMC); PHILIPPINES: Arenas Pt., Luzon, 161 m; off Nagubat I, E. Mindanao, 81 m; Daram Channel, 59 m; off Sueste Pt., W. Luzon, 46 m (all USNM); FIJI IS: Momi Bay, W. Viti Levu, 27 m (USNM). Fossil record. PLIOCENE: Kali Glagah, Boemiajoe, Java, Indonesia (Oostingh 1935); Tjidilem, Sth. Bantam, Java, Indonesia (Oostingh 1939); PLIO-PLEISTOCENE: Mandul I, E. Borneo, Indonesia (Beets 1950). The taxon "Nassa ovoidea Schepman 1911" is used frequently in palaeontological literature on Indonesian fossils, however, Schepman's taxon is a primary homonym of Nassa ovoidea Locard, 1886.

Torres Straits