Hind toe with lobated membrane; tarsi compressed.
86. Fulígula (Pochard, Tufted Duck, Scaup). Bill not longer than head, slightly elevated at base, broader towards tip; edges of upper mandible enclosing edges of lower; nostrils near base.
87. Clangúla (Goldeneye). Bill much shorter than head, depressed towards nail, which is elliptical and decurved at tip; lamellæ hidden; nostrils near middle of bill.
88. Harelda (Long-tailed Duck). Bill much shorter than head, tapering rapidly to broad, decurved nail at tip. Lamellæ slightly exposed; nostrils sub-basal. Feathering at base of bill forming oblique line, advancing furthest forward on forehead. Wings rather short, pointed; scapulars elongate and lanceolate in adult male; tail short, graduated except for two central feathers, which are long and tapering in adult male.
89. Somateria (Eider Duck). Bill swollen and elevated at base, extending up the forehead, there divided by angular projection of feathers; nostrils medial.
90. Œdemia (Scoters). Bill short, broad, with an elevated knob at the base, the tip much flattened; nail large, flat, obtuse, slightly deflected; lamellæ coarse, widely set; nostrils oval, medial; tail short, graduated, acute.