Odostomia (Odetta) circinata A. Adams, 1867 Oscilla circinata is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

This grows gradually stronger as the shell advances, until on the penultimate whorl it has divided this keel into two, the posterior one of which is a little less developed than the anterior one, which resembles the other between the sutures.

The base of the shell is well rounded, somewhat attenuated anteriorly, sculptured like the spaces between the sutures, having seven spiral keels.

The outer lip thin, wavy, showing the external sculpture within.

The columella is decidedly curved, reinforced anteriorly by the attenuated base.