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Abstract

THE second annual report from this station contains the additions made during last year to a knowledge of the fauna, flora, and physical conditions of the Plöner See, prefaced by a geological and hydrographical paper by Dr. Ule. Lists of the Diatoms are furnished by Count Castracane and Prof. Brun. A case of “the breaking of the meres,” caused by great swarms of Rivularia (Gloiotricha) echinulata, is recorded, and the species is described in detail. Amongst the additions to the fauna, a fresh-water Nemertine (Tetrastemma lacustre) and a northern leech (Placobdella raboti, recorded by Prof. Blanchard), several Protozoa and Rotifers are noteworthy. It is, however, to the Plankton that the Director has devoted special attention since the founding of the station in 1891, and accordingly the influence of temperature on the constituents, their unequal distribution through the lake, and their appearance, maximum abundance, and gradual disappearance are carefully noted, together with the bearing of these facts on the present position of the Plankton question.

Forschungsberichte aus der Biologischen Station zu Plön.

By Dr. O. Zacharias. Theil 2, pp. 1 152. Two plates and a map. (Berlin: R. Friedländer and Sohn, 1894.)