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Abstract
The genus Engina Gray is used for Tritonidea australias Pease, which has been included in Maculotriton Da1l, a genus of the Muricidae. The species Phos gracilis Sowerby and Cantarus unicolor Angas are tentatively included in Engina. Related genera and subgenera are discussed and compared with this genus. Prodolia Dall is reduced to a subgenus of Engina and the synonymies of the two species in the subgenus and their Australian occurrences are given. Caducifer Dall is reduced to a subgenus of Monostiolum Dall and Australian records of two species are listed. Ecmanis Gistel and Appisania Thiele are considered to he synonyms of Pisania Bivona-Bernardi. Several previously recognised species appear to rail into the synonymy of Pisanta lasciculata (Reeve), a common Australian species. Jeannea Iredale. Sukumaia Cernohorsky and Taeniola Dall are here recongnised as subgenera of Pisania. A new genus and species. Crassicantharus nonfolkensis. is described and the relationships of Civil pollia Iredale are discussed.