Lithopoma

Lithopoma is a genus of medium-sized to large sea snails with a calcareous operculum, marine gastropod mollusks in the subfamily Turbininae of the family Turbinidae, the turban snails.

==Description== The elevated, imperforate shell has a turbinate or trochiform shape. with a plicate spire that is flat or concave below. Its periphery is carinated or rounded. The base of the shell is somewhat convex. The whorls above are radiately plicate. The operculum is oval, outside coarsely granulose, and either simply convex or with a curved spiral rib with its terminations connected by a straight one. The nucleus is submarginal.