. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 72 J. B. JENNINGS This was confirmed by observation of living flatworms. During digestion the columnar gut cells became shortened, swollen and indistinct from one another, prob- ably as a result of secretory activity or absorption of digested food, or both. The "sphere cells" remained unchanged. These observations confirmed the presence of intraluminar digestion in Macrostomum but after feeding upon Paramecium or small annelids almost all the gut cells showed discrete inclusions which were clearly particles phagocy
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 72 J. B. JENNINGS This was confirmed by observation of living flatworms. During digestion the columnar gut cells became shortened, swollen and indistinct from one another, prob- ably as a result of secretory activity or absorption of digested food, or both. The "sphere cells" remained unchanged. These observations confirmed the presence of intraluminar digestion in Macrostomum but after feeding upon Paramecium or small annelids almost all the gut cells showed discrete inclusions which were clearly particles phagocytosed from the disintegrating food mass in the gut lumen (Fig. 7). Thus digestion in Macrostomum must be a combination of intraluminar and intra- cellular processes, the latter occurring when the food in the lumen is sufficiently disintegrated for the particles to be phagocytosed. The small amount of phagocyto- sis and intracellular digestion seen with crustaceans may be due to the exoskeleton retaining most of the disintegrating material until it is rendered completely soluble. The pH conditions of digestion could not be determined as the flatworms refused to ingest prey stained with indicator. EPIQ GUT PHAR. B 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
