Angulyagra Rao, 1931

Examined species: Angulyagra cf. polyzonata (Frauenfeld, 1862)

(Figs 4T, 5T, 7T).

Remarks: Apart from Notopala, Angulyagra 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.

One species of Angulyagra (total of three specimens with operculum) has been examined for this study (Table 1).