Copies of author's previously published articles inserted. / Bibliography: leaves 161-187. / 187, [53] leaves, [54] leaves of plates : ill., maps ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The pineal complex in gekkotans was examined and compared under the optical and transmission electron microscope in order to elucidate the morphological evidence supporting a role for the pineal organ of these lizards in circadian function. / Thesis (Ph.D.)--University of Adelaide, Dept. of Anatomical Sciences, 1998