Mubton Bird Puffinus heinrothi Reichenow Range.- Known only from New Britain. Description.- A small, wholly black shearwater, about the size of Audubon's but with a more slender bill. Migration.- Nothing is known about the movements of this bird. The fact that it has been collected at the type-locality only close to the Christmas season suggests that it may be a migrant from a northerly breeding ground. Food.- ? Habitat.- Possibly inshore waters Collecting.- Obtain as many as possible since this is one of the rarest and least known of petrels. Particular attention should be paid to the condition of the sexual organs in order to find a clew about the season and place of breeding.