FIGS 49 in Ciliated protozoa from a volcanic crater-lake in Victoria, Australia

FIGS 49±54. Nomarski interference contrast; (49±50) Cristigera setosa. Cc, caudal cilia; Um, undulating membrane; Sc, somatic cilia. Arrowhead in (50) to the groove along the ventral surface, typical of the genus Cristigera; (51) Aspidisca marsupialis. Arrowhead to the characteristic ventral`thorn' of this species, a feature also observed by Penard (1922); (52±53) Mylestoma pusillum. Cc, caudal cilia; arrowhead to the longitudinal groove characteristic of this species; (54) Epalxella striata, a common ciliate in anaerobic environments, found in the brackish water of the crater-lake. Scale bars: 20 mm.