Abstract
In investigation of the ampullar organs of the Bermudan fishes Holocentrus ascensionis and Haemulon sciurus, the sensory hairs of the crista could be clearly seen and kept alive for hrs. Co-ordinated movement (about 125 beats per min.) of the hairs was observed in 1 prepn. of H. ascensionis; and in prepns. of H. sciurus movement was also observed.