Abstract
Fifteen species of Calliostomatidae are known to occur in the Californian marine province. Biological observations in situ on shallow water species indicates they are primarily carnivores, feeding on sessile organisms such as sponge, bryozoan, hydrozoa, diatoms and various Cnidaria. Adult variation, distribution, depth, and habitat are discussed and a summary of distribution records are provided for unique species. Analysis of shell morphology indicates Akoya titanium is a synonymy of A. platinum. A review of museum material also suggests that C. splendens appears to be correctly placed as a synonym of C. supragranosm. A new species of Calliostoma from the most southern portion of the Californian marine province is described and illustrated.
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