1. North American Otter, skull, (Lutra canadensis). 2. Teeth in the upper jaw, right side of the same. 3. Vertical view of the same skull. 4. The Southern Beaked Whale, skull (Rorqualus australis).; 1. North American Otter, skull, (Lutra canadensis). 2. Teeth in the upper jaw, right side of the same. 3. Vertical view of the same skull. 4. The Southern Beaked Whale, skull (Rorqualus australis).

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