. The Canadian field-naturalist. . Figure 4. Anterior view (upper) and posterior view (lower) of fossil humerus of undescribed skunk (NMC 48023) from Old Crow, locality 11 A, Yukon Territory. The total length of the bone is mm. Pennsylvania, and which may be conspecific with Mephitis mephitis. NMC 48023 either represents O. spelaeum, or an undescribed mephitine. Enhydra sp. — Sea Otter Specimen (1): Alaska: Gubik Formation, Skull Cliff, km S Arctic Research Laboratory, Barrow. Left braincase with frontals (California Academy of Science 34558) not seen by me. The age of the only speci
. The Canadian field-naturalist. . Figure 4. Anterior view (upper) and posterior view (lower) of fossil humerus of undescribed skunk (NMC 48023) from Old Crow, locality 11 A, Yukon Territory. The total length of the bone is mm. Pennsylvania, and which may be conspecific with Mephitis mephitis. NMC 48023 either represents O. spelaeum, or an undescribed mephitine. Enhydra sp. — Sea Otter Specimen (1): Alaska: Gubik Formation, Skull Cliff, km S Arctic Research Laboratory, Barrow. Left braincase with frontals (California Academy of Science 34558) not seen by me. The age of the only specimen from Beringia is unknown (Repenning, personal communication 1985). It appears more primitive than Enhydra lutris according to Repenning (personal communication 1985). Other Pleistocene specimens of the genus Enhydra are known from Cape Blanco, Oregon, Moonstone Beach, near Eureka, California, and from the Timms Point silt Member of the San Pedro Formation, San Pedro, California (Repenning 1976). The age of the latter specimen has been estimated at ± 1 X 106 years ago (Repenning 1976). The historical range of the North Pacific Sea Otter {Enhydra lutris) is along the Baja California coast, Mexico, north to Alaska and westward to Kamchatka, and south to northern Japan (Wilson et al. 1991). Sea Otters usually occur in coastal waters less than 35 m deep, but have been found in waters up to 97 m deep. Sea Otters are the largest living mustelids. Adult females usually weigh from 18 to 25 kg and adult males from 27 to 39 kg (Garshelis 1987). Sea Otters primarily feed on invertebrates including molluscs, crabs, and sea stars (Calkins 1978). Gulo gulo — Wolverine Specimens Examined (75): Yukon Territory: Old Crow River localities: Loc. 11:1 ulna (NMC 47767). Loc. IIA: 5 teeth (NMC 13603, 23056, 24363, 24580, 47753), 25 dentaries (NMC 13578, 13584, 13587, 18255, 18259, 24706, 24903, 28777, 45757, 47754-62, 47765, 47768-69, 48430, 48626, 48642, 48647, 49996), 1 humerus (NMC 47
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