PROF. KARL AUGUST MÖBIUS, for many years director of the Zoological Museum in Berlin, died on April 26 at the age of eighty-three. He was a notable naturalist, with a broad and cheerful outlook, greatly interested in the habits of creatures, and enthusiastic over their beauty. There are few zoologists who do not know “The Fauna of the Bay of Kiel” by Mobius and Meyer, the two volumes of which form a rich storehouse of observations on the bionomics of a shallow sea. Mobius was probably the first to establish a salt-water aquarium in Germany, and he helped to start the famous zoological garden at Hamburg. He had, indeed, a strong practical sense, and made many useful suggestions in connection with fisheries, oyster-culture, and the harvest of the sea in general.