Zebinella janus is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoinidae.

[1] (Original description) The white shell is long and ovate conic.

The outer lip is much advanced along the middle, thickened by a broad stout varix.

[2] The type of Z. janus in the Amherst collection, collected by C. B. Adams, at Panama, is a very badly worn medium sized shell, in which the ribs have been worn down to such an extent that one can scarcely count them.

It is absolutely impossible to decide whether spiral sculpture may have been present or absent.