. Bulletin of the British Museum (Natural History) Zoology. 44 H. BERGER & W. FOISSNER. Figs 89-94 Euplotes Corsica from life (Figs 89-91), after wet silver impregnation (Fig. 92), and after protargol impregnation (Figs 93, 94). 89, 90 Ventral and lateral view. 91 Cyst. 92 Dorsal argyrome. 93, 94 Infraciliature in ventral and dorsal view. Description (Figs 89-94, Tables 1, 12). Posterior third of the cell with a hyaline edge, especially on the right side. Ventral surface with 3 median ridges. Dorsal surface only slightly ridged, protrudes beyond the ventral surface posteriorly. About 2 : 1
. Bulletin of the British Museum (Natural History) Zoology. 44 H. BERGER & W. FOISSNER. Figs 89-94 Euplotes Corsica from life (Figs 89-91), after wet silver impregnation (Fig. 92), and after protargol impregnation (Figs 93, 94). 89, 90 Ventral and lateral view. 91 Cyst. 92 Dorsal argyrome. 93, 94 Infraciliature in ventral and dorsal view. Description (Figs 89-94, Tables 1, 12). Posterior third of the cell with a hyaline edge, especially on the right side. Ventral surface with 3 median ridges. Dorsal surface only slightly ridged, protrudes beyond the ventral surface posteriorly. About 2 : 1 flattened. Contractile vacuole at about the level of the transverse cirri, conspicuously near the body margin. Cytoplasm colourless, filled with many c. 5 urn large food vacuoles and some vacuoles containing 4 urn large, dumbbell- shaped crystals. Rapid movement. Adoral zone of membranelles about 62% of body length. Cirri fine, transverse cirri in vivo c. 20 urn long, do not protrude beyond the posterior margin. Cyst slightly elliptical, wall about urn thick. Outer layer yellowish, fine irregularly wrinkled. Cytoplasm densely filled with bright vacuoles (3-4 um in diameter) and 3-5 um large clod-like inclusions. Comparison wtth related species. Euplotes Corsica is very probably conspecific with the E. alatus Kahl, 1932 of Borror (1968) from a tidal marsh pond. It differs from the original description of E. alatus and the population of Gelei (1938) in the shape and size of the body and the number of dorsolateral kineties, respectively. It can be distinguished from the other species of the 'double-eurystomus' type listed in Curds (1975) in the body size and the nearly hemispherical body shape to name but two characters. The rather similar limnetic species E. palustris Ten Hagen, 1980, which is 45-55 um long, has a dorsal argyrome of the 'double-patella' type. Acknowledgements The authors wish to thank Dr Tadao Matsusaka (Kumamoto University, Japan), Dr Wolfgang Vetters and D
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