. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HEAD REGENERATION IN THE EARTHWORM 471 6-12 was following by the implantation, /// reversed orientation, of the nerve cord from post-clitellar segments 13-27. In two and one-half months a brain, lacking commissures, formed independently of the im- planted cord. An anterior perforation of the gut to the outside did not occur. Scries C. Body Wall Type 1. Segments from head-forming region, including gut but lack- ing the central nervous organs, sewed in normal antero-poste- rior orientation to anterior surface of a post-clitell
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HEAD REGENERATION IN THE EARTHWORM 471 6-12 was following by the implantation, /// reversed orientation, of the nerve cord from post-clitellar segments 13-27. In two and one-half months a brain, lacking commissures, formed independently of the im- planted cord. An anterior perforation of the gut to the outside did not occur. Scries C. Body Wall Type 1. Segments from head-forming region, including gut but lack- ing the central nervous organs, sewed in normal antero-poste- rior orientation to anterior surface of a post-clitellar segment; protruding nerve cord of host component pulled into graft. 7 ,. ;?3??Tyr>^ 13 18 19 sgkWiL &#§*Mre^^. FIG. 6. Anterior segments 4-7, lacking the nervous parts, are grafted, in nor- mal orientation, to anterior face of nineteenth segment behind the clitellum. The posterior nerve cord is drawn into the graft. Complete head regeneration results. Case 47 (Figs. 6 and 7<V).—The anterior segments 4-7, including the digestive tube, but lacking the nerve cord, were sewed in normal orien- tation to the anterior face of the nineteenth post-clitellar segment. The nerve cord of post-clitellar segments 13-18 was pulled into the graft in the position occupied formerly by the anterior nerve cord. Two and one-half months later the worm was fixed. Investigation reveals a regenerate possessing two segments, a pro- stomium, an oral aperture, a brain located in the third segment (first. 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 Labora
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
