Abstract: A thermal spring of 55°-58° C is found at 2.50 m depth within the marine area, inside thebreakwater at Yıldızburnu of-Ilıca Bay (Çeşme-İzmir). From the points of quantity and species, Foraminifera living in close proximity to the spring exhibit significant differences then the ones living in normalmarina! conditions outside the thermally influenced area.