Anderson (1913b: 505) and Stefánsson (1913a: 106, and 1913b: 241, 276-277) have called attention to certain rather well-defined differences between the Caribou on both sides of Coronation Gulf and those elsewhere in northern Mackenzie. It may be assumed that the summer home of the former type is on Victoria Island. Many of these animals in former years crossed over to the mainland in the autumn after the freezing of Dolphin and Union Strait, Coronation Gulf, and Dease Strait made such a migration possible; and they recrossed to the island in the spring. During recent years this migration has greatly dwindled (Blanchet, 1930: 50; Birket-Smith, 1933: 93; Clarke, 1940: 98; Gavin, 1945: 227; Godsell, 1937: 288; Banfield, 1949: 481); consequently the Victoria Island population now seems to be largely confined to that island throughout the year. In the American Museum of Natural History I have examined several of Anderson’s specimens of 1911-1912 that are obviously of this form, and I should scarcely hesitate to give them nomenclatural recognition except for the fact that there has obviously been some confusion in the labeling of the specimens (after they reached the museum). Needless to say, a specimen selected as a type should bear unquestionable data. During the winter there is some interchange of populations between Banks and Victoria islands across the frozen Prince of Wales Strait (Armstrong, 1857: 297, 336). The description that Armstrong gives (1857: 478), based ostensibly on Banks Island specimens, indicates that the animals of that island are very close to, if not identical with, _Rangifer pearyi_ of the more northerly Arctic islands. Yet there is no known interchange of populations across the frozen McClure Strait or other wide sea channels in approximately latitude 74° N. The Caribou of Boothia Peninsula and Somerset and Prince of Wales islands are said to be a small form (Wright, 1944: 195). The Caribou of the Dubawnt River region, as far as may be judged from J. B. Tyrrell’s photographs (1897: pl. 1; Seton, 1929, +3+: pl. 22), are indistinguishable from those of the Nueltin Lake region.