. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 508 R. A. SATTERLIE AND J. F. CASE. FIGURE 1. Fertilized egg approximately 15 min after release. The ciliary coating is made up of thousands of sperm adhering to the egg surface (verified by ). X76, light squash. FIGURE 2. About 8-cell stage. The initial cleavages are irregular and apparently incom- plete. At this stage, most of the sperm coating is gone. One hour embryo. X76, light squash. FIGURE 3. About 64-cell stage. Three hour embryo. X76, light squash. FIGURE 4. Pre-swimmer planula. At this stage, the endoderm is f
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 508 R. A. SATTERLIE AND J. F. CASE. FIGURE 1. Fertilized egg approximately 15 min after release. The ciliary coating is made up of thousands of sperm adhering to the egg surface (verified by ). X76, light squash. FIGURE 2. About 8-cell stage. The initial cleavages are irregular and apparently incom- plete. At this stage, most of the sperm coating is gone. One hour embryo. X76, light squash. FIGURE 3. About 64-cell stage. Three hour embryo. X76, light squash. FIGURE 4. Pre-swimmer planula. At this stage, the endoderm is fully formed and the gastric cavity begins to appear. Ciliary activity is weak so the pre-s\vimmer merely spins in circles on the bottom. X76, light squash. FIGURE 5. Early swimmer planula. Ciliary activity is sufficient to lift the planula off the bottom. No muscular activity is evident. X76, light 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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