“…On the shore at Jennycliff young Lacuna were relatively scarce, at a time when veligers were abundant in adjacent waters (Manly, 1975), and numbers of Tricolia and Cerithiopsis very low. Here algal growth, particularly Lomentaria and Corallina, is less vigorous and its coverage of fine sediment, perhaps with adsorbed pollutants related to city effluents, may act as a repellant, especially for larvae (Galtsoff, 1964) and could be lethal (Mileikovsky, 1970).…”