The genusWilliamiain the western Pacific (Mollusca: Siphonariidae)

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Abstract
The taxonomic status and synonymy of Williamia Monterosato, 1884 are discussed. Williamia is retained in preference to Allerya Mörch, 1877 and Brondelia Bourguignat, 1862, both of which have priority. Roya Iredale, 1912 is transferred from Trochidae to Siphonariidae as a synonym of Williamia. Roya kermadecensis Iredale, 1912 is synonymised with Capulus nutatus Hedley, 1908, which in turn is placed as a geographic subspecies of W. radiata Pease, 1861. Allerya japonica Habe, 1962 is considered a probable synonym of W. radiata. W. maxwelli n.sp. is described from the Upper Oligocene to Lower Miocene of New Zealand. Roya spongotheras Bertsch, 1980 is transferred to an undescribed genus of the Tylodinidae.