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[[image]] [[strikethrough]] B.S. 22203. [[/strikethrough]] ^[[S.I. 36513B.]] Dry hills showing deposits containing gypsum. General Roca, Río Negro, Argentina. December 2, 1920. [[image]] 1432. Dry hills with deposits containing gypsum, near General Roca, Río Negro, Argentina. December 2, 1920. [[image]] B.S. 22206. Old channel of Río Negro. Coots, [[underlined]] Fulica armillata [[/underlined]] and [[underlined]] F. leucoptera [[/underlined]] swimming in water. General Roca, Río Negro, Argentina. December 3, 1920.