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A partial skeleton of Hydrodamalis has been collected from a Pleistocene interglacial beach deposit, 35 meters above present sea level, on Amchitka, Aleutian Islands, Alaska. This is the first discov­ ery of the genus in place in Pleistocene deposits outside the Com­ mander Islands (Komandorskiye Ostrova), U.S.S.R. Parts of the young but apparently nearly full grown individual were found in a position which suggested that the animal, after death, had been washed into shallow water or up onto a beach. The Pleistocene animal was toothless, as was the modern Steller's sea cow (Hy­ drodamalis gigas), which was exterminated by Russian hunters about 1768. Like the modern form, the Pleistocene sea cow undoubt­ edly subsisted on kelp. It is indistinguishable from the modern species. A uranium-series date of 127,000±8,000 years on bone from this beast is consistent with a generally accepted age of the last ma­ jor interglacial stage.

Steller's sea cow (Hydrodamalis gigas) of Late Pleistocene age from Amchitka, Aleutian Islands, Alaska