Fig. 160. Biocoenoses of the benthos in the Bay of Riga (Shurin, 1961). 1 Cardiwn- 



Mya-Macoma ; 2 Macoma baltica ; 3 Pontoporeia affinis ; 4 Pontoporeia femorata ; 



5 Dreissena polimorpha ; 6 Mytilus-Balanus. 



