Abstract:
In the samples collected in Puck Bay of the Baltic Sea five species of bivalves and nine species of gastropods have been found, including a four new ones for Poland´s fauna: Hydrobia neglecta Muus, Turboella benzi (Ar. et Magg.), Turboella sarsi (Lov.), Rissostomia brunosericea Smagowicz; moreover the so far unrecorded — for Poland — forms Peringia and Hydrobia, are cited. A mass occurrence of Mytilus edulis L. and of the young Cerastoderma lamarcki (Reeve) has been noted, while the other species of bivalves have been but scantily represented. The results have been compared with the data obtained for 1962 and 1967: there was a marked change in numbers, perhaps connected with the extend of pollution in the sea.