. Electron-microscopic structure of protozoa . Text-figure 6. Schematic drawing of a longitudinal section through the anterior half of Chromulina psammobia. C, chloroplasts; G, Golgi body; I, invagination of the cell surface enclosing the internal flagellum; N, nucleus; M, mitochondrion; S, stigma. The kineto-rhizoplastic complex includes 1, the free flagellum; 2, its kinetosome; 3, rhizoplast; 4, dense zone tentatively identified as a centrosome. The kineto-stigmatic complex includes 5, the internal flagellum lying above the stigma and 6, its kinetosome. From Rouiller and Faure-Fremiet, 1958a


. Electron-microscopic structure of protozoa . Text-figure 6. Schematic drawing of a longitudinal section through the anterior half of Chromulina psammobia. C, chloroplasts; G, Golgi body; I, invagination of the cell surface enclosing the internal flagellum; N, nucleus; M, mitochondrion; S, stigma. The kineto-rhizoplastic complex includes 1, the free flagellum; 2, its kinetosome; 3, rhizoplast; 4, dense zone tentatively identified as a centrosome. The kineto-stigmatic complex includes 5, the internal flagellum lying above the stigma and 6, its kinetosome. From Rouiller and Faure-Fremiet, 1958a. The cell body, up to 15 ^ in length, is limited by a typical unit membrane, without any clearly evident outer coating or wall. The cytoplasm is fibrogranular and encloses numerous mito- chondria of typical protozoan microtubular structure, assorted


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