Shell small and fusiform, strongly constricted at base, apical angle 25°, the greatest width at the lower third of total height. Protoconch elongating the general outline of teleoconch, consisting in 2.5 convex whorls, well delimited from teleoconch by the clear-cut change of sculpture; apex rounded and smooth, subsequent whorls with strong axial ribs, extending from suture to suture, numbering 15-16 on last whorl, their intervals smooth. Teleoconch of 8 whorls, suture shallow. 2 beaded spiral cords per whorl, situated near upper and lower sutures, with a wide interval; 18 to 20 axial ribs per whorl, wide and low, crossing the cords at right angles, with a rounded bead at each intersecton. A third beaded spiral cord on last whorl, developed from a fine thread between the 2 main cords, and remaining weaker than them. A fourth weak, unbeaded spiral cord emerging from suture at base of last whorl, followed immediately by a fifth spiral cord equal to it. Beads becoming smaller towards aperture. Aperture circular. Colour plain pale brown, suture a little darker, protoconch and the 3 earlier whorls of teieoconch creamy-white.
Size: holotype total height 3.3 mm; maximum width 1.3 mm; height of protoconch 0.49 mm; width of protoconch at base 0.36 mm.

This species could be confused, in its shape and colour, with Joculator keratochroma n. sp., but differs from that in its larger size, its 2 cords instead of 3, and its ribbed protoconch instead of smooth. It differs from Horologica turrigera (Watson, 1886) and Horologica martini n.sp. in its ribbed protoconch. It differs from Dizoniopsis gothica n.sp. in its colour (pale brown instead of black), and its ribbed protoconch of 2.5 whorls instead of 4.5, It differs from other species of Mendax and Prolixodens in its 2 beaded cords on teleoconch whorls instead of 3.

Réunion. Found dead in hand-dredged sand at 30 m, Souris-Chaude, Trois-Bassins.