. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B FIG. 3. Larvae, twenty-four hours after fertilization. Abbreviations: at, apical tuft; ac, apical cilia; pc, posterior cilium; dc, dorsal cilia. A. Normal larva. Ventral view. Mouth, oesophagus, and intestine visible. The pigmented areas are broken up into well-defined chromatophores. Two pairs of bristles are present. B. Same larva as A. Side view. C. Exogastrula. Shows elongate, hollow, post-trochal region. On the surface, toward the posterior end, short cilia are visible. the mouth, the intestine through the anus. From
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B FIG. 3. Larvae, twenty-four hours after fertilization. Abbreviations: at, apical tuft; ac, apical cilia; pc, posterior cilium; dc, dorsal cilia. A. Normal larva. Ventral view. Mouth, oesophagus, and intestine visible. The pigmented areas are broken up into well-defined chromatophores. Two pairs of bristles are present. B. Same larva as A. Side view. C. Exogastrula. Shows elongate, hollow, post-trochal region. On the surface, toward the posterior end, short cilia are visible. the mouth, the intestine through the anus. From each of the chaetae- sacs there now extend two bristles. The position and structure of these bristles are very characteristic. Arranged at intervals along their length are serrated "; As the larva swims about, the bristles, projecting posteriorly, are seen being rotated about the long axis of the animal. That muscles have developed can be deduced from the observed contraction of the larva? and the movement of the chaetae-sacs and bristles. Exogastrula (Fig. 3C). At this stage, the exogastrulae can easily be distinguished, even with low magnification, from the normal animals. The most striking feature is the behaviour of the bristles when the animal is in motion. The larva rotates as usual as it moves in a forward direction. But the bristles project laterally instead of. 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
