Shell small, 13 mm. (1/2 inch) in height, claviform, with tall spire, about twice height of aperture plus canal, and truncated anterior end. Whorls 8 +, protoconch and early whorls missing. Spire-whorls sculptured with a smooth, heavy subsutural fold, followed by a moderately wide and deeply concave shoulder area, bearing 2-3 irregularly finely beaded spiral threads; then the peripheral angle, set above middle whorl height, and bearing simple strong rounded nodes. Three to four unequal gemmate spiral cords between the periphery and the lower suture. A further 6-7 gemmate cords on the base to the anterior fasciole, which is indistinctly closely spirally Urate. Colour greyish-buff. Paradrillia inconstans belongs to the same group as that centred around patruelis (Smith), from which it is distinguished mainly, by being more slender, in having a more prominent subsutural fold, and stronger peripheral nodes, not two vertically fused series as in patruelis.

It is characterized by 1) claviform shell 7 mm high, 2) protoconch large, conical, of 4 whorls, the first convex (tip eroded); subsequent whorls strongly carinate, the last with distant, markedly backwardly curved axials adapical to the keel, 3) teleoconch whorls angular, with rather strong subsutural fold followed by moderately concave shoulder slope, 4) body whorl less than one half the total height, rather rapidly tapering at the base, 5) inner side of the outer lip lirate, 6) anal sinus moderately deep, U-shaped, located on the shoulder slope, 7) sculpture of coglike peripheral nodes situated on thin axial ribs, 1 then 2 abapical spirals on spire whorls, 13 on body whorl, those over the neck stronger and closely set; the axials cross the spirals forming a square reticulated pattern.
DISTRIBUTION AND HABITAT. Paradrillia inconstans is distributed from South Africa to Japan. It is a sublittoral element dwelling in fine sandy and muddy substrates.
FOSSIL RECORDS. Late Pliocene of the Philippines; Plio-Pleistocene of Japan; Holocene of Thailand.

Paradrillia inconstans is distributed from South Africa to Japan. It is a sublittoral element dwelling in fine sandy and muddy substrates.