Windfall Harbor. Admiralty Island. Alaska. April 17 to May 19 1907. Mammals. Frank Stephens. Oregon Finback Whale. Balaenoptera physalus velifera. Saw several whales in Seymour Canal on the way in to Windfall Harbor. They appeared to be of the above species. Bay Porpoise. Phocaena communis. Saw several porpoises between Windfall Island and Swan Island. Sitka Deer. Odocoileus columbianus sitkensis. Probably common. Miss Alex- ander saw one but none of the rest of the party saw any. We bought a ham of venison, freshly killed, of an Indian. Tracks were abundant, but soon after we came the deer seemed to work back up the mountain. Sitka Mouse. Peromyscus sitkensis? A mouse of the white-footed or deer mouse group is common. We caught them principally along the beach, but I got two on the mesa above camp. They did not appear to be as plentiful there. They took both grain and meat baits. Three females contained foetuses, 4, 5 and 6 respectively. Apparently they breed late here. They are probably not sitkensis but may be either the mainland form or an unde- scribed subspecies. Sitka Meadow Mouse. Microtus sitkensis. Moderately common. Found princi- pally in the patches of old grass on the beach just above high tide. Harbor Seal. Phoca richardi. Saw single individuals several times. Admiralty Island Brown Bear. Ursus arctos. Several bears have been killed not far away this spring and tracks were seen three or four miles back from the beach. They are said to be feeding on deer. Pacific Otter. Lutra canadensis pacifica. Miss Alexander purchased the skull, and later the skin, of an otter killed near here this spring. We have seen no signs of otter yet. Pacific Mink. Lutracla vison energuemnos. We have seen a few tracks but have caught no minks yet. The Indians have offered several for sale.