. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 212 G. O. MACKIE AND C. L. SINGLA. FIGURE 3. Fine structure of parietal cells forming the ampullar wall in Botrylloides. (A) shows several partially contracted cells. On the inner side, contractile folds (cf) are seen, and microfilaments (mf) lie against the membrane. On the outer side, next to the tunic (t), the cells are joined by zonulae occludentes (zo). (B) shows a gap junction between two parietal cells and (C) shows detail of the zonula occludens. Bar in (A) is 1 ^m, in (B) and (C) chronized. Blood flow through th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 212 G. O. MACKIE AND C. L. SINGLA. FIGURE 3. Fine structure of parietal cells forming the ampullar wall in Botrylloides. (A) shows several partially contracted cells. On the inner side, contractile folds (cf) are seen, and microfilaments (mf) lie against the membrane. On the outer side, next to the tunic (t), the cells are joined by zonulae occludentes (zo). (B) shows a gap junction between two parietal cells and (C) shows detail of the zonula occludens. Bar in (A) is 1 ^m, in (B) and (C) chronized. Blood flow through the colonial vascular network appears to be due chiefly to the contractions of the ampullae, and is affected only locally by the actions of the hearts of the zooids. Bancroft (1899) showed that the rhythmic flushing of blood through the vascular network continued in anaesthetized colonies after the hearts of the zooids had stopped beating, and that coordinated ampullar contractions persisted in regressive colonies after the zooids had degenerated. In the present study, regular, synchronized ampullar contractions were seen in strips cut from the edge. 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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