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16 1 Class Bivalvia * * * Mytilus edulis * * * Crossostrea virginica Class Gastropoda All gastropods 1 0.
The class Bivalvia showed the highest density in June and the lowest in September (Table 2).
The densities of the class Gastropoda were higher than those of the classes Bivalvia and Polyplacophora in the samples from June and September, whereas the class Bivalvia showed higher densities than those of the classes Gastropoda and Polyplacophora in samples from December of 2000 and March and December of 2001.
On the other hand, the density of molluscs for the combined dominant species belonging to the class Bivalvia did show differences between the two sites, such that the sheltered shore showed a greater number of bivalves.