. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 304 LEONARD P. SAYLES while the ventral side was occupied mainly by the implant. The fourth double bud, implant 5-7, developed for two weeks in the direction of the type in which a cone of new material occurs near the open side of the anal segment. Then there began a rapid growth of the ' cone' re-. FIG. 9. Bud induced at eleventh segment. Age, 18 days. A, partial anal seg- ment; C, cone of new material projecting into open side of anal segment; D, dorso- lateral region of bud; /, exposed part of implant. Asterisk marks basa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 304 LEONARD P. SAYLES while the ventral side was occupied mainly by the implant. The fourth double bud, implant 5-7, developed for two weeks in the direction of the type in which a cone of new material occurs near the open side of the anal segment. Then there began a rapid growth of the ' cone' re-. FIG. 9. Bud induced at eleventh segment. Age, 18 days. A, partial anal seg- ment; C, cone of new material projecting into open side of anal segment; D, dorso- lateral region of bud; /, exposed part of implant. Asterisk marks basal end of line of demarcation between reddish ventral half and lighter colored dorsal half. FIG. 10. Double bud induced at eleventh segment. Age, 30 days. R, ridge (on right side of peristomium) which was derived from anal collar region present two weeks earlier. FIG. 11. Tail bud induced at twelfth segment. Age, 24 days. A, partial anal segment; AC, anal cone region. FIG. 12. Bud induced at twelfth segment. Age, 13 days. A, partial anal seg- ment; C, large mass of new material growing out from implant region (I); K, knob of material. FIG. 13. Tail bud induced at fifteenth segment. Age, 21 days. AC, anal cone. gion and a reduction of the anal segment. At the end of 4 weeks this bud was a fairly well-developed head with the anal segment represented only by a knob of material on the dorsal side of the peristomium. Only 5 segments showed in this bud, all of them peripheral to the implant which extended some distance along the ventral side of the bud. 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 Clar
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
