Abstract
It is suggested that the genera Apomatus and Protula should be revised to reflect the close similarity between P. tubularia and the two species of Apomatus, and the dissimilarity of Protula intestinum. It is further suggested that the presence or absence of an operculum is not a sufficiently important character for distinguishing Apomatus from Protula, or Filograna from Salmanica; and therefore that these two pairs of genera should be fused into two genera.

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