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The Gordon's Bay region occupies the north western corner of False Bay, a large rectangular bay, bounded on the west by the Cape Peninsula ending at Cape Point, on the east by the precipitous slopes of the Steenbras Mountains ending at Cape Hangklip, and in the north by the sandy beaches of the isthmus of the Cape Peninsula. Across the Bay in a south westerly direction from Gordon's Bay, lies Simons Bay, a former British Naval base. The waters of False Bay are comparatively warm äs they consist of a s mall branch of the Agulhas Current (Mocambique Current) which divides at Cape Point and washes onto the bay, the other branch, abutting the cold Benguella Current of the Atlantic Ocean, turns southwards to be eventually lost. On occasions, however, after strong south easterly gales, the Benguella Current is diverted into False Bay bringing cold water from the Atlantic and with it certain species of diatoms äs yet only recorded from the Atlantic coasts (cf. Giffen 1969b: in press). The following are the species not previously recorded from the eastern Cape coasts by the author but reported from the Atlantic: Coccomis pseudomarginata GREGORY forma with very large blank bands across the striae of the epivalve, Diplomis lineata DONKIN, Licmophora Juergensü AGARDH, Nitychia composita n. sp. (recently recorded from Saldanha Bay on the west coast), Rhoicosphenia Adolpbi M. SCHMIDT, Tracbyneis speibonae GIFFEN. The most important recent collections of cUatom material from False Bay are those of the „Gauss", Dr. E. VON DRYGALSKI'S Deutsche Südpolar Expedition 1901—1903, worked by HEIDEN and KOLBE (1928) from large samples taken from Simon's Bay. They reported 365 species of which 7 were mesohalobic, 15 were oligohalobic and the remainder euhalobic. More recently CHOLNOKV (1963) dealt mostly with the mesohalobic material from Cape Hangklip, Steenbras and Gordon's Bay, all within False Bay. In 1945 summer a large quantity of Dtctyota dichotoma AGARDH was collected for University classwork in algal morphology and later formed the material for this investigation. Much of the Dlctyota proved sterile and was set aside to be finally prepared äs a diatom sample and preserved in the GIFFEN collection äs sample 594. The algae was collected from a large tidal pool to the south of Gordon's Bay village.

Marine Littoral Diatoms from the Gordon's Bay, Region of False Bay Cape Province, South Africa