Antarctic Eocene selachians were reported from the La Meseta Formation of Seymour Island and from glacial erratics of Mount Discovery, Antarctica. Seymour Island has produced the most diverse Palaeogene selachian fauna of the Southern Hemisphere so far. Up to now, 23 selachian taxa (20 sharks, 2 rays) have been described from the Eocene of Antarctica. Recent geological and palaeontological investigations on Seymour Island yielded new selachian remains from Lutetian (middle Eocene) deposits. An upper tooth is referred to the requiem shark Carcharhinus and a rostral spine to the sawfish Pristis. These occurrences represent the first Eocene records of both groups in the Southern Hemisphere and extend their geographic distribution. In addition, a fragmentary stinging ray attributed to Myliobatoidea is presented for the first time from Antarctica. The diversity of Eocene La Meseta fishes is reflected.