. The Biological bulletin. Biology; Zoology; Marine biology. 266 KOMATSU ET Figure 6. Development of specimens of Astcrina minor. All drawings are from a living specimen, jelly layer is not shown except in A. All scales show 100 ixm. A) Two-cell stage, f, fertilization membrane; j, jelly layer. B) Eight-cell stage, hr after spawning, f, fertiliza- tion membrane. C) 64-cell stage, hr after spawning, bm, blastomere. D) Early wrinkled blastula, 10 hr after spawning, cm, cell mass; et, egression tract. E) The most wrinkled blastula, hr after spawning. F) Early gastrula, 18 hr aft
. The Biological bulletin. Biology; Zoology; Marine biology. 266 KOMATSU ET Figure 6. Development of specimens of Astcrina minor. All drawings are from a living specimen, jelly layer is not shown except in A. All scales show 100 ixm. A) Two-cell stage, f, fertilization membrane; j, jelly layer. B) Eight-cell stage, hr after spawning, f, fertiliza- tion membrane. C) 64-cell stage, hr after spawning, bm, blastomere. D) Early wrinkled blastula, 10 hr after spawning, cm, cell mass; et, egression tract. E) The most wrinkled blastula, hr after spawning. F) Early gastrula, 18 hr after spawning. Egression tracts (et) are still recognized on the surface of the embryo, view from the vegetal pole, bp, blasto- pore. G) Early gastrula, 18 hr after spawning, view from the animal pole, et, egression tract. H) Gastrula, 36 hr after spawning. I) Gastrula, 40 hr after spawning, bp, blastopore. J) Brachiolaria, 2 and a half days after spawning, view from the ventro-lateral (right) side. K) Brachiolaria, 3 days after spawning, ventral view, ba, brachiolar arm; su, sucker. L) Brachiolaria at the commencement of hatching, 4 days after spawning, view from the ventro- lateral (left) side, f, fertilization membrane. M) Brachiolaria, just after hatching, ventral view, ba, brachiolar arm; su, sucker. D) Same as M, dorsal view, ba, brachiolar arm; hp, hydropore. O) Same as M, ventro-lateral (right) view, hp, 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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