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Description of Entosiphon cuneatiformisCells are about 40 microns in diameter, and about 15-20 microns thick. Cells are almost circular in outline, almost flat ventrally, and with six folds, deep anteriorly and gradually flattening out posteriorly, but forming five lobes on the dorsal anterior surface. The innermost of these rather overhangs the mouth opening but the middle two and two lateral lobes terminate at about the level of the mouth, so that there appears to be an anterior median papilla. The pellicle is rigid and thick. The mouth-reservoir-vacuole system is characteristic, as are the two flagella which emerge from the reservoir floor. The anterior one, about 30 microns in length has a waving action, and the cell is pulled forward in a series of small jerks, much like locomotion in E. sulcatum. The trailing flagellum is about 60 microns long, of uniform width, and easily seen. The siphon is quite short and stout. It resembles a wedge driven into the cytoplasm. In most other species of Entosiphon, the siphon extends to the posterior end, at times appearing to pierce the pellicle. The nucleus is nearer median than lateral and nucleoli may be present or absent. The cytoplasm is homogenous and inclusions appear to be small numerous discs of paramylum and a few larger spheres, possibly lipids. Nutrition is saprozoic.