. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CTENOPHORE COLLOBLASTS 53: RV. NC Me FIGURE 16. Schematic drawing of a resting colloblast as seen with the electron micro- scope ; to emphasize its helical form, the thread is partly represented in shadowed perspective. CC represents covering cell; EG, eosinophilic granule; HT, helical thread; Me, mesoglea; MF, membrane folds; N, nucleus; NC, nervous cell; R, root; r, radius; RV, refractive vesicle; S, synapse; and SB, spheroidal body. The helical form of the thread of the resting colloblast was demonstrated both by SEM and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CTENOPHORE COLLOBLASTS 53: RV. NC Me FIGURE 16. Schematic drawing of a resting colloblast as seen with the electron micro- scope ; to emphasize its helical form, the thread is partly represented in shadowed perspective. CC represents covering cell; EG, eosinophilic granule; HT, helical thread; Me, mesoglea; MF, membrane folds; N, nucleus; NC, nervous cell; R, root; r, radius; RV, refractive vesicle; S, synapse; and SB, spheroidal body. The helical form of the thread of the resting colloblast was demonstrated both by SEM and by TEM observations of thick sections of tentillae. This confirms the early light microscope studies of Komai (1922, cited by Hyman, 1940) and Weill (1935a), and the first electron microscopy description by Hovasse and De Puytorac (1962). However, Bargmann et al. (1972) considered that the "spiral filament" seen by light microscopy was in fact the helically arranged membrane folds surrounding a straight tube. This discrepancy can be explained as follows. In a resting colloblast, the membrane folds follow the helical thread along the generatrix line facing the longitudinal axis of the cell (Fig. 17a). But, in an extended colloblast, it is the membrane folds that form a loose helix around the straightened thread (Fig. 17b). This arrangement results. 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 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
