 He then worked at the Institute of Geology, Taihoku Imperial University (Taipei) during 1942–1945 and then at the Rikkyo University (Tokyo) from 1945–1980.His doctoral dissertation was submitted to Tohoku University and was privately published by Yūhodō (Ishijima, 1954).He described a total of 139 taxa of fossil calcareous algae (Iryu, 2004) including at least 114 species of Corallinales, and he produced more than 45 publications on coralline algal taxonomy.