Notopala Cotton, 1935

Examined species: Notopala ampullaroides (Reeve, 1863) (Figs 4S, 5S, 7S).

Remarks: Apart from Angulyagra, Notopala can be distinguished from other genera with a concentric inverted-comma-shaped operculum by the following combination of characters: a relatively small nuclear region with shiny grains or veins, a relatively thick enamel layer and a thin marginal region that obviously differs in colour from the enamel region.