The Fauna of Akkeshi Bay : XXV. Gastropoda (With Plates I-V)

HABE, Tadashige

In 1955, the writer reported the bivalves and a tooth shell from Akkeshi Bay and its adjacent region. This is a report on the gastropodous species from the same region in which sixty-eight species are contained, including four new genera and six new species. The molluscan fauna of this area is characterized by the elements dwelling in the cold current and none of indicators of the warm current is found. But, some of them, such as Batillaria cumingii, Mitrella bella, Littorina brevicula and Ocenebra aclunca, may be regarded as the elements of the continental coastal fauna as they widely range from the southern China toSaghalien and Kuriles in the north along the coast of the continent, without the influence by the oceanic currents, both warm and cold. Before going further, the writer wishes to express his hearty thanks to Prof. Tohru Uchida, Director of the Akkeshi Marine Biological Station and the late Dr. Shiro Okuda and Mr. Fumio Iwata who have kindly sent the material at his disposal. Thanks also are due to Dr. Tokubei Kuroda under whose kind guidance this study has been carried out and to Prof. Iwao Taki who gave him valuable advices.

The Fauna of Akkeshi Bay : XXV. Gastropoda (With Plates I-V)

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