. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE PRODUCTION OF GRAFTED EMBRYOS. 87 111 a large number of instances a true fusion occurred during the blastula stage, as recognized by the continuous ectoderm and common blastoccele. In Fig. 36 a blastula is shown with a part extruded beyond the fertilization membrane. In Fig. 37 the blastula is pinched together near the middle. A whole and a half egg have been fused in the formation of the single blastula shown in Fig. 38. At least two eggs have united in Fig. 39. In Fig. 40 an egg a half egg and a quarter egg have so fus
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE PRODUCTION OF GRAFTED EMBRYOS. 87 111 a large number of instances a true fusion occurred during the blastula stage, as recognized by the continuous ectoderm and common blastoccele. In Fig. 36 a blastula is shown with a part extruded beyond the fertilization membrane. In Fig. 37 the blastula is pinched together near the middle. A whole and a half egg have been fused in the formation of the single blastula shown in Fig. 38. At least two eggs have united in Fig. 39. In Fig. 40 an egg a half egg and a quarter egg have so fused. Figs. 41, 42 and 43 represent other fusions of two or more eggs into single giant blastulae. Figs. 44 and 45 are interesting because. FIG. 49. they suggest how a common blastoccele may be formed by the breaking down of the separating wall. The clusters were not necessarily linear. Triangular groups like Figs. 45, 46 and 47 were not uncommon. Other clusters were quite irregular as in Figs. 48 and 49. A large cluster like the one shown in Fig. 49 was more frequently composed of agglutinated eggs or a complex of fused and agglutinated eggs; smaller clusters also included agglutinated and fused members shown in Figs. 50, 51, 52, 53, 54, 47 and 48. Fused blastulae tended to lose their individual identity by the continuity of their common layer of cells, by the disappearance of their inner separating walls and by the closer approximation of the separate blastulae. These processes continued until a spherical or almost spherical giant blastula was produced, in which it was difficult or impossible to distinguish the component members, as in Figs. 55, 56 and 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. ). Ann
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