. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ILYANASSA EGG CAPSULE 385 present in micrographs of this area. Also, because the embr\o chamber floor and the basal disk extending from it protrude from the pedal gland, they probably are not covered with the material of LO. The numerous projections on the capsule surface and the basal disk (Fig. 3) contain primarily the fibers of L2 indicating that this layer is extensively redistributed during the sculpturing of the capsule that occurs in the foot. The material of LI is also redistributed by ventral pedal gland activity. B
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ILYANASSA EGG CAPSULE 385 present in micrographs of this area. Also, because the embr\o chamber floor and the basal disk extending from it protrude from the pedal gland, they probably are not covered with the material of LO. The numerous projections on the capsule surface and the basal disk (Fig. 3) contain primarily the fibers of L2 indicating that this layer is extensively redistributed during the sculpturing of the capsule that occurs in the foot. The material of LI is also redistributed by ventral pedal gland activity. Before capsules are sculptured. L1 can van,' from 100-500 nm in thickness (Fig. 8), but LI is moulded into a more uniform layer while in the pedal gland (Fig. 7). Histochemistry The Ilyanassa egg capsule is composed of protein and carbohydrate. With the exception of sudan black, stains utilized in this study were positive for at least some layers of the capsule wall and plug. At the level of light microscopy. L1 could not be differentiated from LO. so that the results for LI include both layers, and L4 could not be resolved well. Therefore, the histochemical results include only LI. L2, and L3. Results of staining thick sections of the capsule (Fig. 13) and from staining of the capsule before sectioning (Table I) show that all layers of the Ilyanassa capsule wall contain protein, but only LI. L3. and the plug were very positive for aromatic amino. 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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