The genera Crucigera and Serpula are represented in the fauna of Russian Far-Eastern seas by 3 species: Crucigera iregularis (Bush, 1904), Crucigera zygophora (Johnson, 1901) and Serpula columbiana Johnson, 1901. Crucigera irregularis is recorded for the first time for the region. Most of the preserved collection materials were re-examined. It was stated that Serpula columbiana have been erroreously referred to Serpula vermicularis. The data on ecology and distribution of the species in the Far-Eastern seas of Russia are given.