The selectmen of the town of West Haven and the committees of other towns shall, at the expense of their respective towns, procure and cause to be lodged and kept in the office of the town clerk of each town, respectively, accurate maps showing the boundary lines of their respective towns in the navigable waters of the state and all designations of ground by local authorities for the cultivation of shellfish made within such boundaries, and shall number such designations on such maps and shall cause to be designated on such maps all natural oyster, clam and mussel beds lying within their several towns respectively, as the same are ascertained by the report of such committees so recorded in such towns, and the committee or selectmen who thereafter make any such designation shall mark the same upon such map.