. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 328 ALICE DEUTSCH The presence of large numbers of acid phosphatase-positive lysosomes in the intestinal cells indicates that there is an intracellular phase of digestion. This phase probably begins in the less electron-dense cell inclusions and ends in the more electron-dense lysosomes. There are greater numbers of the former type of cell inclusion in well-fed specimens compared to specimens on diets of low-density food: the latter have from 0 to 4 of these inclusions and the former have about 15 to 40 inclusions in transve
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 328 ALICE DEUTSCH The presence of large numbers of acid phosphatase-positive lysosomes in the intestinal cells indicates that there is an intracellular phase of digestion. This phase probably begins in the less electron-dense cell inclusions and ends in the more electron-dense lysosomes. There are greater numbers of the former type of cell inclusion in well-fed specimens compared to specimens on diets of low-density food: the latter have from 0 to 4 of these inclusions and the former have about 15 to 40 inclusions in transverse sections. Further evidence that these inclusions contain food molecules comes from the fact that specimens raised on bacterial diets had intracellular inclusions filled with homogeneous material (Fig. 3) and those raised on algal diets had inclusions filled with fine grainy " - 13 FIGURE 12. Longitudinal section of the intestine of Dlplolaimclla sp. showing amoebae "resting" on the fibrillar matrix. There are undigested and partially digested bacteria nearby. A = amoeba, B = bacterial cell, BD = bacterial cell debris, FM = fibrillar matrix, LU = lumen. Bar is ^m- FIGURE 13. Longitudinal section of the intestine of Diplolaimella sp. showing the remains of Dunaliella sp. and several intact bacteria. AD = algal cell debris, B = bacterial cell; FM - fibrillar matrix, I = intestine, LU = lumen. Bar is 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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