_Specific Character._--The head and neck all round, with the fore part of the breast and fore part of back, black; the sides of the head and the sides and hind part of the neck dark green, reflecting purple; length of bill, when measured along the gap, two inches and five-sixteenths; length of tarsi one inch and three-eighths; length from the point of the bill to the end of the tail nineteen inches; wing eight inches and five-eighths; a broad white band crossing the secondaries and continues on the inner primaries. Adult male with the forehead, crown, throat, and upper part of the fore neck brownish-black; sides of the head, neck, and hind neck, dark green; lower portion of the neck all round, with the upper part of the breast, purplish-black; rest of the lower parts white, undulated with black towards the vent; under tail-coverts blackish-brown; tail short, dark brown, margined and tipped with lighter brown; upper tail-coverts and rump blackish-brown; middle of the back undulated with black and white; fore part black; wings brown, darker at the base and tips; speculum white, formed by the band crossing the secondaries and inner primaries; scapulars and inner secondaries undulated with black and white; secondary coverts blackish-brown, undulated with white. Female with a broad patch of white on the forehead; head, neck, and fore part of the breast umber brown; upper parts blackish-brown; abdomen and lower portions of breast white; scapulars faintly marked with white. WHISTLER. Golden Eye, Great Head. _Fuligula Clangula_, Linn. _Specific Character._--Bill black, high at the base, where there is quite a large spot of white; head ornamented with a beautiful crest, and feathers more than an inch long and loose; insides yellow; the entire head and upper part of the neck rich glossy-green, with purple reflections, more particularly so on the throat and forehead; rest of the neck, with the entire plumage, white; sides of the rump and vent dusky grey; tail greyish-brown; back and wings brownish-black--a large patch of white on the latter, formed by the larger portion of the secondaries and the tips of its coverts; legs reddish-orange. Length twenty inches; wing nine inches. Female head and upper part of the neck dull brown; wings dusky; lower parts white, as are six of the secondaries and their coverts; the tips of the latter dusky. About three inches smaller than the male. DIPPER. Butter Ball, Buffel-Headed Duck, Spirit Duck. _Fuligula Albeola_, Linn.