. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8 M. J. KATZ oc. FIGURE 7. Electron micrograph of oblique longitudinal section through the tail. EP = epidermis, ES = endodermal strand, M = muscle cell, mf = myofibrils, NC := notochord, nu = nucleus of muscle cell, OC = outer cuticle, T = tunic. Bar = 1 The notochord cells themselves have irregularly shaped nuclei, which are about 4 ^m in diameter. The cytoplasm is dark and quite granular, and the cells contain much moderately dilated rough endoplasmic reticulum (RER). The notochord cells also contain prominent yolk vesicl
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8 M. J. KATZ oc. FIGURE 7. Electron micrograph of oblique longitudinal section through the tail. EP = epidermis, ES = endodermal strand, M = muscle cell, mf = myofibrils, NC := notochord, nu = nucleus of muscle cell, OC = outer cuticle, T = tunic. Bar = 1 The notochord cells themselves have irregularly shaped nuclei, which are about 4 ^m in diameter. The cytoplasm is dark and quite granular, and the cells contain much moderately dilated rough endoplasmic reticulum (RER). The notochord cells also contain prominent yolk vesicles. More numerous than the yolk vesicles are other slightly larger ( yum in diameter) membrane-bound vesicles that are filled with less densely packed material (Fig. 14). Occasionally, these vesicles can be seen budding off from the cell surface and appearing to empty their contents into the notochordal lumen ('star' in Fig. 8). In the notochordal cells, mitochondria are much more sparse than in the surrounding muscle and nervous system cells. The notochord cells of Ciona do not contain the thick bundles of intracellular filaments that are found in the notochord cells ofAmphioxus (Eakin and Westfall, 1962; Flood, 1975b). 4. Tail musculature The tail musculature is the most well studied of all the developed organ systems of tunicate tadpoles (, Berrill and Sheldon, 1964; Terakado, 1972; Ohmori and Sasaki, 1977; Whittaker et ai, 1977; Meedel and Whittaker, 1979; Whittaker, 1979a), and there are already several excellent ultrastructural reports (Pucci-Minafra, 1965; Castellan! # a/., 1972;CaveyandCloney, 1972, 1974, 1976; Bone et al., 1977;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report
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