814 



BIOLOGY OF THE SEAS OF THE U.S.S.R. 



this biocoenosis. Among the Polychaeta Nephthys coeca, N. ciliata, Onuphis 

 sp. and numerous Serpulidae are predominant. Various Buccinidae, Crepi- 

 dula, Pododesmus macroshisma, Astarte borealis, A. banksi, Nucula tenuis and 

 others are predominant among the Mollusca. 

 The biocoenosis Macoma calcarea-Ophiura sarsi is located in the central 



Fig. 408. Distribution of biocoenoses in Penzhina In- 

 let (Vinogradova, 1954). / Balanidae-Hydroidae-Bry- 

 ozoa-Decapoda biocoenosis; // Ophiura sarsi bio- 

 coenosis ; /// Leda biocoenosis of the type pernula- 

 Ophiura ^/-jZ-Polychaeta. Mean biomass for each 

 biocoenosis indicated in circles, in g/m 2 ; A — Crusta- 

 cea; В — Mollusca; С — Echinodermata ; D — Poly- 

 chaeta; E — Others. 



part of the Bay. In this biocoenosis the most numerous among the Polychaeta 

 are Lumbriconereis impatiens, Myriochele oculata, Praxilella praetermissa, 

 Rhodine gracilior; among the Mollusca Leda (pernula?), Macoma moesta, 

 M. torelli, Musculus corrugatus, Yoldia traciaeformis, and Nucula tenuis; 

 there are numerous Crustacea (families Ampeliscidae). Among the Deca- 

 poda there are Chionoecetes opilio, Hyas coarctatus, Pagurus pubescens ; the 

 Polychaeta Nephthyidae, Aphroditidae ; and the starfish Crossaster papposus, 

 Pteraster and others. 



