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| Biddulphia antediluviana var. excavata "Adam's Collection" according to Mills 1933 |
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| Aulacodiscus floridanus (Boyer) F.W. Mills 1933 |
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| Aulacodiscus hyalinus (Boyer) F.W. Mills 1933 |
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| Biddulphia inelegans var. tubulosa (Brun) F.W. Mills 1933 |
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| Biddulphia arctica var. antarctica (Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. samoense (Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia antediluviana var. minutum (Greville) F.W. Mills 1933 |
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| Biddulphia arctica var. quinquelobatum (Greville) F.W. Mills 1933 |
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| Biddulphia arctica var. neapolitana (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. spitzbergensis (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. tetragona (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Biddulphia arctica var. japonica (Grunow in Schmidt et al.) F.W. Mills 1933 |
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| Bellerochea malleus var. tetragona (Grunow in Van Heurck) F.W. Mills 1933 |
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| Biddulphia antediluviana var. minor (H. Peragallo & M. Peragallo) F.W. Mills 1933 |
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| Biddulphia antediluviana var. pentagona (Hustedt) F.W. Mills 1933 |
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| Biddulphia antediluviana var. trigona (M. Peragallo in Tempère & Peragallo) F.W. Mills 1933 |
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| Aulacodiscus cosmiodiscus (Mann) F.W. Mills 1933 |
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| Azpeitia antiqua (Pantocsek) F.W. Mills 1933 |
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| Biddulphia abyssorum var. saratovianum (Pantocsek) F.W. Mills 1933 |
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| Biddulphia neogradensis (Pantocsek) F.W. Mills 1933 |
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