. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 A. J. GOLDFARB. nated, and these were in nearly every instance, clusters of two. The separation of the embryos of Arbacia occurred in exactly the same manner as described by Driesch. These permanently agglutinated plutei may be attached to one another at any angle as in Figs. 85, 86 and 87. In Fig. 85 the plutei are attached by their oral ends; in Fig. 86, the oral end of one is attached to the side of the other, and in Fig. 87 a group. of five plutei are agglutinated at various angles. As in the previous stages of develo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 A. J. GOLDFARB. nated, and these were in nearly every instance, clusters of two. The separation of the embryos of Arbacia occurred in exactly the same manner as described by Driesch. These permanently agglutinated plutei may be attached to one another at any angle as in Figs. 85, 86 and 87. In Fig. 85 the plutei are attached by their oral ends; in Fig. 86, the oral end of one is attached to the side of the other, and in Fig. 87 a group. of five plutei are agglutinated at various angles. As in the previous stages of development one finds here also, that the agglutinated partners may develop at different rates, the one a pluteus, the other a blastula as Fig. 88, or a pluteus and a gastrula, Fig. 89. Driesch described the following types of plutei from his •cultures: (a) True twins, i. e., agglutinated plutei. (&) Twins with a common blastoccele, i. e., body wall partially fused, internal organs double. (c) Twins with a reciprocal influence on growth, a true fusion with an enlargement of the 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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