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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FlG. 9. To illustrate the formation of a new axial gut lateral to the axis of the original gut, after oblique section ; D. lacteum. Magnification, 17 diameters. The regenerated intestinal branches are shown in black. Fi<;. 10. To illustrate the development of a head symmetrically about the end of the axial gut and posterior to an anterior lateral slip which contained no nervous system. Magnification, 17 diameters. dicate these stages. The number of hours given in each instance shows the length of time elapsing after isola

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FlG. 9. To illustrate the formation of a new axial gut lateral to the axis of the original gut, after oblique section ; D. lacteum. Magnification, 17 diameters. The regenerated intestinal branches are shown in black. Fi<;. 10. To illustrate the development of a head symmetrically about the end of the axial gut and posterior to an anterior lateral slip which contained no nervous system. Magnification, 17 diameters. dicate these stages. The number of hours given in each instance shows the length of time elapsing after isola Stock Photo
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RHRMA1

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2170 x 1151 px | 36.7 x 19.5 cm | 14.5 x 7.7 inches | 150dpi

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FlG. 9. To illustrate the formation of a new axial gut lateral to the axis of the original gut, after oblique section ; D. lacteum. Magnification, 17 diameters. The regenerated intestinal branches are shown in black. Fi<;. 10. To illustrate the development of a head symmetrically about the end of the axial gut and posterior to an anterior lateral slip which contained no nervous system. Magnification, 17 diameters. dicate these stages. The number of hours given in each instance shows the length of time elapsing after isolation of the pieces : Eighteen hours. The cut surface is covered with epithelium and there is some accumulation of parenchyma cells near it. Thirty-eight hours. Further accumulation of cells near the cut surface. Sixty-six hours. Anastomosis of the posterior intestinal rami in the vicinity of the cut surface (Fig. n,A). Advance of nerve fibers into the head anlage. In some specimens there is a slight accumulation of cells in the vicinity of the future pharynx. Ninety hours. The accumulation of cells in the pharyngeal anlage is more marked. Between the region of anastomosis of the posterior rami and the pharyngeal anlage new intestinal branches are being formed. The head anlage has advanced in development. One hundred and fourteen hours. Considerable anastomosis. 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 work.. 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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