Shell pearshaped or conic, with rather acute spire, polished ivory white, with four whorls beside the nucleus; transverse sculpture of incremental lines; spiral sculpture of three to five close-set, sharp, punctate grooves in front of the suture, more distant anteriorly, and a similar but more numerous and uniformly spaced series just behind the pillar, behind which again are four or five widely separated similar grooves, the posterior near the periphery; between them and near the periphery, as well as behind it, are no grooves or but faint spiral obsolete striae; suture distinct but not channeled; last whorl much the largest; outer lip straight, simple, slightly thickened; body with a moderate deposit of callus; pillar as in A. curtulus, but less strongly twisted and with the plait and recurved margin subequal; although the margin is continuous, there is a rather deep sulcus behind the anterior end of the pillar, corresponding to a groove, which bounds the columella callus; longitude of shell, 5; latitude, 3; longitude of aperture, 3 mm.

This shell and the last species seem to stand in an intermediate position between Actaeon of the typical kind and Cinulia. If the outer lip should eventually become much thickened, of which, however, there is no satisfactory evidence, these shells might be referred to Cinulia. If the A. curtulus recalls Pedipes mirabilis Muhlfeldt in its form and sculpture, A. perconicus recalls P. elongatus Dall.

Near the Galapagos Islands