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[[image]] B.S. 16202 - Blowing a channel through the marsh with dynamite. Mouth of Bear River, Utah. June 25, 1915. [[image]] B.S. 16204 - Dissection of [[underlined]] Erismatura jamaicensis [[/underlined]] [[male symbol]] adult. Under the neck may be seen an inflated air-sac. This communicates with the trachea immediately behind the laryngeal chamber, and lies between trachea and oesophagus. It has no connection with the pulmonary air-sac series. Duckville Laboratory. Mouth of Bear River, Utah. June 27, 1915.