Hydrodamalis gigas (Zimmermann, 1780). Geogr. Gesch. Mensch. Vierf. Thiere, 2, p. 426.

TYPE LOCALITY: U.S. S. R., Kamchatsk. Obi., Commander Isis., Bering Isl.

DISTRIBUTION: Originally coasts of N. Pacific Ocean, but in historic time known only from Commander Isis. (U.S. S. R.). Extirpated about 1770. Reviewed by Heptner and Naumov, eds., 1967, [Mammals of the Soviet Union], 2(l):25-46; see also Domning, 1975, J. Mammal., 56:556- 558.