Classification of Dall 1916
G. Turritella Lamarck 1799 [turret shell]
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†Turritella halensis Dall 1916
†Turritella tampae Heilprin 1887
G. Marginella Lamarck 1799
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†Marginella halensis Dall 1916
†Marginella silicifluvia Dall 1916
G. Phacoides Blainville 1825
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†Phacoides hillsboroensis Heilprin 1887
†Phacoides perovatus Dall 1916