[Tupi boi-una, ‘serpens obscurus’ (Martins). Carried by the Portuguese from Brazil to Ceylon.]

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  a.  A large water-snake of Brazil of dark color (? Boa aquatica). b. A harmless snake of Ceylon.

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1774.  Goldsm., Nat. Hist. (1862), II. III. iii. 429. The Boyuna of Ceylon is equally a favourite among the natives.

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