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Summary
Ten species of opisthobranchs and two species of pyramidellids are recorded from soft bottom benthonic samples obtained during the Environmental Study of Port Phillip Bay 1968–1973. A new genus, Austrocylichna, type species Bulla (Atys) exigua A. Adams, 1854, and two new species, Ercolania margaritae and Cerberilla incola, are described.