. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 372 CHAS. W. HARGITT. In Figs. 3-5, as well as in those already cited, are shown interesting and more or less common forms of variant canals. Similar conditions are also to be distinguished in several of the other figures given. For convenience we may discuss these features under the following heads: (i) Bifurcations, (2) loops, (3) spurs, (4) anastomoses. It may be altogether probable that these conditions graduate somewhat insensibly into each other, so that they may really be but varying expressions of one and the same fu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 372 CHAS. W. HARGITT. In Figs. 3-5, as well as in those already cited, are shown interesting and more or less common forms of variant canals. Similar conditions are also to be distinguished in several of the other figures given. For convenience we may discuss these features under the following heads: (i) Bifurcations, (2) loops, (3) spurs, (4) anastomoses. It may be altogether probable that these conditions graduate somewhat insensibly into each other, so that they may really be but varying expressions of one and the same fundamental process But as suggested, such a classification will at least serve con- venience in description. I. Bifurcations.—Several illustrations of this feature have already been cited. Others are shown in Figs. 4—6. For the most part these apparently arise as a result of division of the peripherally developing canal, though the centripetally directed type is not lacking, as is seen in Fig. 4. It may be said in passing, that the figures given are for the most part typical ones, each representing usually several similar cases. In development 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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