. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 3. Larvae from isolated blastomeres. A. CD larva, twenty-five hours. B. CD larva, eighty-five hours. C. CD-PL2 larva, fifty-six hours. D. E-PL2 larva, forty-five hours. (On the next day, the apical tuft was no longer present.) E. E-PL2 larva, eighteen hours. It is exceptional in that it possesses two apical tufts. CD.—During the first cleavage of CD there is formed a polar lobe of the same size as the normal second lobe. After the division, it flows into the D cell. At the second cleavage, another, smaller lobe forms fr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 3. Larvae from isolated blastomeres. A. CD larva, twenty-five hours. B. CD larva, eighty-five hours. C. CD-PL2 larva, fifty-six hours. D. E-PL2 larva, forty-five hours. (On the next day, the apical tuft was no longer present.) E. E-PL2 larva, eighteen hours. It is exceptional in that it possesses two apical tufts. CD.—During the first cleavage of CD there is formed a polar lobe of the same size as the normal second lobe. After the division, it flows into the D cell. At the second cleavage, another, smaller lobe forms from the D cell. This lobe has the variable character of the normal third lobe. The early CD larvae appear to be quite normal—the prototrochal cilia are in their usual position and the typical apical tufts are formed (Fig. 3, A}. However, since the cilia and tuft are of the normal size, they are, proportionately, too large for these reduced larva?. Later, the paired bristles are formed. However, no apical cilia develop, and in many instances (17 out of 29), the apical tuft does not disappear when it does in controls (Fig. 3, B). CD-PL2.—-If during the course of the first cleavage of the CD blastomere, the polar lobe is removed, the next cleavage occurs without the formation of a lobe. The CD-PL2 larva possesses a typical apical. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
