Tectus niloticus: Shell large, ponderous, conical, appearing subperforate, covered - by a corneous striate, brown or yellowish cuticle usually lost on the upper whorls ; color beneath the cuticle white, longitudinally striped with crimson, violet or reddish brown, the base maculate or radiately strigate with a lighter shade of the same ; spire strictly conical, apex acute, usually eroded, whorls 8-10, the upper ones tuberculate at the sutures, and spirally beaded, the following flat on their outer sur- faces, smooth, separated by linear sutures, the body-whorl expanded, dilated and compressed at the obtuse periphery, more or less convex below, indented at the axis ; umbilical tract covered by a spiral fold above deeply entering callus ; aperture transverse, very oblique ; columella oblique, terminating in a denticle below, and with a strong spiral fold above, deeply inserted into the axis. Alt. 80-100, diameter 100-120 mm. Range: Indian Ocean ; New Ireland ; New Caledonia ; North Australia, etc.