A. Newton, 1893, _Dictionary of Birds_, p. 733; and D. Bannerman, 1931, _Birds Trop. West Africa_, Vol. II, p. 205 (crocodile bird). Deusing, 1939, _Auk_, Vol. 56, p. 367 (grebe). Bent, 1925, _U. S. Natl. Mus. Bull._, 130, p. 98 (eider duck).