(Plates 1--9). THE following notes on the Great Northern Diver (Colymbus immer) were made chiefly at a nest on the great lake of Thingvallavatn in South-west Iceland during June, 1949. They are supplemented by field notes made during the previous June in the hill-lake country east of Stathur on the Hrutafjord (North Iceland). In 1948 I was accompanied by Captain T. B. W. Jeans, and in 1949 by Dr. ...

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