You're conflating two different pluralizations (and doing it incorrectly at that ). The word is ``metropolis'', not ``metropolus'', which is what would take the ``i'' pluralization. And, even if it were, it would be ``metropoli'', not ``metropolii''.
The ``-is'' formation is rather less common in English, and the appropriate pluralization for it would be either ``-es'' or ``-ides'', I believe, though I'm not an expert at either Latin or Greek. Anyway, this is how we arrive at ``crises'' as the plural of ``crisis''. The English folks would tell you that it's an English word now and would be pluralized ``metropolises'', but that's hardly euphonious. I'm not sure what distinguishes ``-ides'' from ``-es'', but I'd guess that the correct word would be ``metropolides''.
). The word is ``metropolis'', not ``metropolus'', which is what would take the ``i'' pluralization. And, even if it were, it would be ``metropoli'', not ``metropolii''.
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