. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 130 N. YATSU. my conclusion. He obtained through the section near the ani- mal pole along op (his Fig. 3, B, on p. 240) the animal larva without any apical organ, the vegetative one in this case having been provided with the multiple apical organs (his Fig. 10, E, on p. 433). On the other hand, in another case, he found that both the animal and vegetative larvae had the normal apical organ. (his Fig. 10, A and B] when he cut along the plane near the equator (kl of his Fig. 3, B]. In this case it may be inferred that the sect
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 130 N. YATSU. my conclusion. He obtained through the section near the ani- mal pole along op (his Fig. 3, B, on p. 240) the animal larva without any apical organ, the vegetative one in this case having been provided with the multiple apical organs (his Fig. 10, E, on p. 433). On the other hand, in another case, he found that both the animal and vegetative larvae had the normal apical organ. (his Fig. 10, A and B] when he cut along the plane near the equator (kl of his Fig. 3, B]. In this case it may be inferred that the section plane bisected the basis of the apical organ. He gives still another instance of the animal larva with the apical organ (his Fig. 10, C) obtained when he cut below the equator along ;;//;/ (his Fig. 3,-5). The pilidium No. 10 (4-D) is a very important one. It was produced from an egg from which about one third of the animal hemisphere was cut off. This was about as large as a perfect larva if seen from the side, but it was extremely compressed laterally. It has not only two apical organs but two guts. I suspect that it might have been disturbed by some unknown cause at the two-cell stage because, as a rule, half-larvae obtained by isolation of blastomeres are larger than one half of the normal larvae. In another pilidium (No. 4) I found the apical organ shifted from the normal position (4^). In spite of this, it swam with the apical pole directed forward like a normal 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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