Alvania partimcancellata
Alvania partimcancellata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Description
The length of the shell is, and its diameter is.The minute shell is ovate. It contains 5 slightly convex whorls. They are regularly diminishing in size upwards, the body whorl much the largest. The spire measures about one-third the total length. They are ornamented by numerous longitudinal ribs, disappearing towards the periphery against a series of spiral ridges which continue to the base of the shell, with a single line near the suture. The suture is slightly channelled. The aperture is oval.