Bacula of four species of Hipposideros. a: H. ater (near Madras, Tamil Nadu, India) (dorsal view); b: H. cineraceus (Malaysia) (bi = dorsal; bii = lateral) c: H. fulvus (Wavulpane, Sabaragamuwa, Sri Lanka) (lateral) d: H. durgadasi (after Topal, 1975)