and on bivalves. Some also prey on worms and barnacles.

The snails are gonochoristic, i.e. the individuals have just one sex. The female snails deposit their eggs in horny capsules either in a single form or in clusters arranged around a hollow axis. The single forms have a flattened, disk-shaped, or vase-shaped form. The clusters are hemispherical or cylindrical. Development is usually direct. The larvae