MacNeil, 1960. Tertiary and Quarternary Gastropoda of Okinawa. U.S. Geological Survey Professional Paper, 339: 1 -148 .
New Species-Group Names:
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loochooensis MacNeil, 1960. p. 124;pl. 7. f. 24;pl. 10. f. 12.
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precancellatus MacNeil, 1960. p. 122. pl. 10. f. 11.
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shimajiriensis MacNeil, 1960. p. 122. pl. 6. f. 5. 11.