Several specimens probably belonging to pedunculate ctenostome Clavopora hystricis were obtained by Japanese Antarctic Expedition. It consists of a peduncle of muscular heterozooecia and a calyx of ordinary autozooecia. Attaching base of peduncle is circular with serrate edge showing the smaller inactive zooecia. Muscular heterozooecia are elongate hexagonal in extended state, and numerous annules appear when they contact strongly. According to the author, the genus Ascorhiza is identical with Clavopora, and O'Donoghue's C. occidenlalis is identical with C. hystricis Busk. The present specimens can be identified to Clavopora hystricis by their circular base, myoecial peduncle and autozooecial calyx.

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Recently the authors had a chance to collate almost all records of crinoids from Japanese waters described by Gislen, A. H. dark, some Japanese outhers, etc. since 1884. As the result of this collation, a total of 103 species of crinoids including stalked forms and unstalked comatulids are listed.

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