Text-fig. 2. —Frequency distributions of riblet counts of the first post-nuclear whorl in the P. hectori-hunuaensis complex for samples (combined) falling within the indicated zones. These frequencies are spaced in accordance with the strictly north-south distances separating zone centres. The means (triangles) and linear regressions are shown. Zone means and S.E.'s are as follows: Zone 1, 43.1 ± 0.21; 2, 46.1 ± 0.18; 3, lower modality 46.7 ± 0.17, upper modality 57.4 ± 0.78; 4, lower modality 48.0 ± 0.31, upper modality 61.8 ± 2.23; 5, lower modality 42.5 ± 0.93, upper modality 50.8 ± 0.48.
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Transactions of the Royal Society of New Zealand : Zoology, Volume 4, Issue 10, 24 March 1964, Page 163
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88Text-fig. 2.—Frequency distributions of riblet counts of the first post-nuclear whorl in the P. hectori-hunuaensis complex for samples (combined) falling within the indicated zones. These frequencies are spaced in accordance with the strictly north-south distances separating zone centres. The means (triangles) and linear regressions are shown. Zone means and S.E.'s are as follows: Zone 1, 43.1 ± 0.21; 2, 46.1 ± 0.18; 3, lower modality 46.7 ± 0.17, upper modality 57.4 ± 0.78; 4, lower modality 48.0 ± 0.31, upper modality 61.8 ± 2.23; 5, lower modality 42.5 ± 0.93, upper modality 50.8 ± 0.48. Transactions of the Royal Society of New Zealand : Zoology, Volume 4, Issue 10, 24 March 1964, Page 163
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