THE BALTIC SEA 



315 



In these areas west of the Darss ridge, a still considerable qualitative variety 

 of benthos is observed ; there are a large number of worms : Nephthys ciliata, 

 N. coeca, Terebellides stromi, Pectinaria koreni, Scoloplos armiger and 



PONTOPOREIA AFFINIS 



У:::: :\ mesidothea community 



.0000 

 0000 

 0000 



MACOMA BALTICA 



COMMUNITY 



IMPOVERISHEDCOMMUNITY 

 OF POLYCHAETA 

 CRUSTACEA SCOLOPLOS — 

 PONTOPOREIA FEMORATA 

 MESIDOTHEA 

 MACOMA CALCAREA 



COMMUNITY 



Fig. 149. Distribution of bottom communities in the Baltic Sea (various authors) 



Rhodine loveni are especially frequent ; among the molluscs : Macoma calcarea 

 and M. baltica ; Syndesmya alba, which is already found in large numbers in 

 the western part of the Northern Belt ; Modiolaria nigra ; among the crusta- 

 ceans : Diastylis rathkei, Pontoporeia femorata ; and among the echinoderms : 

 Ophiura albida. 



