This bird, which is a new species, was found only on a small island in lat 75° 20' on the west coast of Greenland; it was found associating with the greater Tern, and when it saw its nest in danger, like them, uttering the same clamorous notes, flew, without fear, above its nest close to the head of the party. Its eggs were of the same size and form, nearly of the same colour, as those of the Tern. [Ross, Appendix, No. II, p. lvii.]