Six new species of septibranch molluscs are described from the northeastern Pacific Ocean. Three species of Cuspidaria are proposed, assignable to Cuspidaria (s. str.), Rhinoclama and Luzonia. A fine large Cardiomya is assigned to a new subgenus, Labromysa. Poromya (s. str.) is recorded for the first time from the Northeastern Pacific, and a new species of the subgenus Dermatomya is described.

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Paradoris Bergh, 1884 (type : P. granulata Bergh, 1884) is a rare genus of the Mediterranean Sea (Trieste). It is reported to occur in Japan, and a new species. P. tsurugensis, is described.

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Live materials of a helicarionid species Kaliella yaeyamensis collected from various localities (including its type locality) were examined and its genital and radular features are described. Although the present species has been assigned to the genus Parakaliella of the tribe Euconuli, subfamily Euconulinae, this species is transferred to the genus Liardetia (s.s.) of the tribe Microcysti of the same subfamily on the basis of genital and conchological features. L. yaeyamensis distributes at least from Ryukyu Islands to Caroline Islands through Formosa. As several related taxa, probably conspecific, are known from various localities, its distribution range would be extended further. Local differentiation within this species is recognized from the morphological variation in the penial stimulator.

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Chromodoris leopardus established by Rudman, 1987 from Australia and the Philippines, is also proved to occur in Japan.

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[in Japanese]

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