• Animal Systematics, Evolution and Diversity
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• v.9 no.2
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• pp.103-113
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• 1993

We express our sincere thanks to Professor M. Murano, Tokyo University of Fisheries, for encouragement during the study and kindly criticizing the manuscript. The junior author indebted to Professor S.F. Mawatari, Hokkaido University, for his various facilities. We also immensely owe our gratitude to many persons who made available interesting specimens for this study.