. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BLACK SEA 447 of the Bosporus, including the western part of the Anatolian coast and the southern half of its eastern part. A number of species not found in other parts of the Black Sea have been recorded here. Tuna, swordfish, lobster and a number of invertebrates are fairly common here. An exchange of fauna pro- ceeds continuously between the Black Sea and the Sea of Marmora through the Bosporus. The waters of the Sea of Marmora, carrying its characteristic fauna, penetrate into the Black Sea
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BLACK SEA 447 of the Bosporus, including the western part of the Anatolian coast and the southern half of its eastern part. A number of species not found in other parts of the Black Sea have been recorded here. Tuna, swordfish, lobster and a number of invertebrates are fairly common here. An exchange of fauna pro- ceeds continuously between the Black Sea and the Sea of Marmora through the Bosporus. The waters of the Sea of Marmora, carrying its characteristic fauna, penetrate into the Black Sea by the lower current. Such. Fig. 214. Zoogeographical regions of Black Sea (Yakubova) (see text). typical Mediterranean plankton as the Siphonophora Diphyes, the Radio- laria Acanthometra, and the polychaete Tomopteris are found in the Bosporus area of the Black Sea. A number of the Mediterranean benthic forms have been discovered in the Bosporus region of the Black Sea, within the sphere of the lower Bosporus currents; these forms, apparently, do not penetrate very far into the Black Sea (Nikitin, 1927, Jakubova, 1948, Bacesko, 1959). They have been recorded at depths of 38 to 94 m (more than 60 species) and include such forms as the Coelenteratae Phellia elongata and Virgularia mirabilis; the echinoderms Ostergrenia adriatica, Ophiura texturata, Ophiothrix echinata and Cucumaria orientalis; the molluscs Nucula sulcata, Turitella communis, Murex tareniinus, Venus bragniarti, Nassa incrassata, Corbula gibba, Fissurella graeca, Natica fusca, Gibbula deversa, Schismope stria tula, Cyclonassa brusinai, Pandocia singularis; the worms Phascolosoma minuta, Paronais lira, Proclea graffi, Drilonereis filum, Polidora antennata, Sternaspis scuttata; the crustaceans Cymodoce erythrea euxinica, Elaphognathia monodi, Pontotanais borceai, Colomastix pusillus, Harpinia della-vallei, Philomedes interpuncta, Citereis jonesii; 20 species of the Foraminifera and many others. They chiefly extend
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