A new pleurotomariidMellariumgen. nov. occurs in the Anisian (Middle Triassic) of the Southland Syncline. Superficially the new genus is similar to Shansielia Yin, a late Paleozoic gastropod. Two new species ofMellariumare described,M. mutchi, from lower Etalian greywacke, and underlying breccias, andM. nodulosum, from the upper Etalian. A crushed gastropod from the upper Countess Formation of the Eglinton Valley is possibly conspecific withM. mutchi