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Abstract
The Australian Recent and Tertiary species of Penion Fischer are reviewed. Penion is shown to be properly used for the Southern Hemisphere species previously referred to a number of genera including Siphonalia. Austrosipho and Verconella. Penion is contrasted with related Australian genera and is also shown to be closely allied to the Northern Hemisphere genera Neptunea Röding and Kelletia Fischer. The Recent Australian species are reduced to two, P. mandarinus (Duclos) and P. maximus (Tryon). The New Zealand P. mandarinus auct. is referred to P. sulcatus, (Lamarck). Three fossil species and one subspecies are recognisea.