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245. Charts. Serpents Mouth (Boca de la Sierpe), south entrance to Gulf of Paria, South America, northeast coast, from surveys by U. S. S. Hannibal in 1931 and 1938 and British surveys in 1866 and 1936 (Trinidad I. from British colonial survey in 1920-25); no. 1963. Scale naut. m.=1.5 in., natural scale 1:50,000.