Abstract
Eight species of the genus Diodora GRAY 1821 were reported from the Japanese Islands:-D. funiculata (REEVE), D. sieboldii (REEVE), D. ticaonica (REEVE), D. mus (REEVE), D. tanneri (VERRILL), D. crucifera (PILSBRY), D. elaborata (SOWERBY), D. humilis (YOKOYAMA). Beside the above written, two new forms are found from Japan. The purpose of this paper is to review these species hitherto described and undescribed, and to show their geologic range.
