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12 specimens Alaska Alberta American Angeles County Museum animals aperture Ariz asphalt axial Baja California beaks bones Brea Pleistocene brown Bull Canada Carpinteria chitons Color common Comst Condor County Museum collection culture dire wolf Eagle Eskimo extinct Fabr Family feet figs ground sloth Gund Height holotype horse illust inches in length incisors July June June-July Linnaeus living lizard low tide mammals Manitoba Mexico Miller Miocene Navajos Nebr northern Baja California Nothrotherium occur operculum paratypes periostracum Pleistocene posterior Pueblos Rancho La Brea Range ribs ridges rocks S.Calif sabre-tooth cat San Diego Scud sculpture Sept shells Skeleton Skin skull snake southern California species specimens Alaska specimens Ariz specimens B.C. specimens Calif specimens Colo specimens Fla specimens including specimens Manitoba specimens Texas spiral sublittoral sublittoral zones surface tail teeth Utah valves whorl Zoology publ