The Director of the Zoological Garden in Rotterdam, Dr. J. Büttikofer, presented some fishes to the Leyden Museum, one of which is new to science and dedicated to its donor. They were brought to the above mentioned garden from Warri in Upper Nigeria, West Africa. They are: Calamichthys calabaricus Smith, a male and a female. Ophiocephalus africanus Steind., 2 specimens.