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Asakura, A. ; Nishihama, S. (1987). Studies on the Biology and Ecology of the Intertidal Animals of Chichijima Island in the Ogasawara （Bonin ）Islands− III． Description, Form and Habitat of the Trochid Snail， Monodonta perplexa boninensis n. subsp. in Comparison with those in Monodonta perplexa perplexa (Pilsbry）. VENUS (The Japanese Journals of Malacology). 46(4): 194 − 201.
Asakura, A. ; Nishihama, S. (1987). Studies on the Biology and Ecology of the Intertidal Animals of Chichijima Island in the Ogasawara （Bonin ）Islands− III． Description, Form and Habitat of the Trochid Snail， Monodonta perplexa boninensis n. subsp. in Comparison with those in Monodonta perplexa perplexa (Pilsbry）. VENUS (The Japanese Journals of Malacology). 46(4): 194 − 201.
