| Summary: | The present paper deals with three Zaus species, one of which is new to science, found in a sample of algal rinsings which was collected at Narrow Cape on the east side ofKodiak Island, Alaska, by Mr. K. Hirano ofHokkaido University. Taxonomy within the genus had long been confused due to the presence of some inadequately described species as well as dubious records (see revision by Lang, 1965), especially connected with Z. aurelii Poppe, 1884, Z. caeruleus Campbell, 1929, Z. intermedius Nicholls, 1939, Z. serratus Monk, 1941, and Z. schiiferi K1ie, 1949. Since, in those species, Z. intermedius was re-described by Ito (1974), and Z. aurelii is reported in the present paper together with a full re-description, the confused status within the genus will fairly clear up. Description of the coloration is based upon observations on formalin-preserved specimens. Dissected somites and appendages are mounted on slides with gum-chloral medium. The type-series is deposited in the Zoological Institute, Faculty of Science, Hokkaido University. Before going further, I would like to express my sincere gratitude to Professor Mayumi Yamada of the Faculty of Science, Hokkaido University, for reading the manuscript. Sincere thanks are also due to Mr. K. Hirano of the Faculty of Fishery, Hokkaido University, who gave me this interesting material at my disposal. The electron microscope study was carried out with kind assistance of Mr. Y. Nodasaka of the School of Dentistry, Hokkaido University, to whom I am much obliged.
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