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Description of Oxytricha granuliferaHypotrich ciliate, about 70-83 x 25-33 microns, ellipsoid, 4 transverse cirri, 4 dorsal kineties, and about 23 adoral membranelles. Margins convex, left one narrowed anteriorly, both ends rounded. About 2: 1 flattened dorso-ventrally. Macronuclear segments with small nucleoli, about 10 x 7 microns, lying slightly left of the median. Micronuclei about 3 x 2 microns. Contractile vacuole on the left-hand border, above the middle of the cell, during diastole with an anterior channel. About 0.5 microns subpellicular granules yellow to orange-yellow, irregularly distributed in loosely arranged groups. In small perhaps precystic specimens they are distinctly orange. Cytoplasm colourless, with some small crystals, many 2-5 microns large homogeneous globules, and food vacuoles which contain naked amebae and cysts, large (7 x 2 microns) fungal spores, green algae, and zooflagellates. Movement rapid. Adoral zone of membranelles about 35% of body length, bases of the largest membranelles about 6 microns wide, cilia of distal membranelles in vivo about 15 microns long. Buccal area small, deep, and rather distinctly bent anteriorly. Undulating membranes bent, superimposed anteriorly. Bases of the frontal cirri only slightly enlarged. Ventral cirri arranged in a line. 3 postoral ventral cirri near the cytostome, 1 ventral cirrus adjacent to the slightly enlarged long transverse cirri which protrude beyond the posterior border. Marginal cirri about 15 microns long, going backward the bases become smaller and the distances between them become wider. Marginal rows distinctly separated posteriorly. Dorsal cilia iabout 4 microns long. First dorsal kinety slightly shortened anteriorly.