Finlay, H. C., 1926. New Shells from New Zealand Tertiary Beds: Part 2. Transactions and Proceedings of the New Zealand Institute, 56: 227 -258 .
New Species-Group Names:
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rivertonensis Finlay, 1926. p. 255. pl. 56. f. 13.
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tahuensis Allan, 1926. p. 344. pl. 77. f. 6.