Shell elongate-conic, uniformly light brown; nuclear whorls a little more than 2, depressed helicoid, with the axis at right angles to that of the following whorls, in the first of which they are about one fourth immersed; postnuclear whorls 9, moderately rounded, sutures impressed; axial sculpture of strong, narrow, nearly vertical ribs, of which 16 appear on the early whorls, gradually increasing to 24 on the last whorl; interspaces a little wider than the ribs, marked with 6 or 7 broad, shallow, spiral series of pits, on the later whorls the spaces between these pits are cut by 1 or 2 incised spiral lines; periphery of last whorl well rounded; base rather long, well rounded, the upper part marked by continuations of the axial ribs between which are 3 or 4 spiral series of pits, at about the middle of the base the axial ribs fade out and the spiral series of pits are joined to form incised spiral lines which grow gradually weaker toward the umbilical region; aperture oval, outer lip thin, showing the external sculpture within; columella raised, slightly curved, body with a distinct callus. The type measures: length, 4.3 mm; diameter, 1.1 mm.
Holotype: No. 749 (Calif. Acad. Sci. Paleo. Type Coll.), from Loc. 27,229 (C.A.S.), dredged in from 3 to 9 fms. in Bahia Honda, Panama. L. G. Hertlein collector. Forty-five additional specimens were dredged at the same locality.
In the key given by Dall & Bartsch to west coast species in the subgenus Pyrgiscus, this would follow almo, a species described from San Diego, which it much resembles, differing principally in the arrangement of the spiral series of pits in the interspaces between the axial ribs.