. The Biological bulletin. Biology; Zoology; Marine biology. A STATISTICAL STUDY OF MITOSIS AND AMITOSIS. 225 and arranged in a reticulate manner, can be seen oozing out into the " body ; These large dorsal cells are continuous with the liver cells. While it may be inferred, from facts to be presented later that the cells in the posterior part of the digestive tract are engaged in the digestion and storage of food materials, those in the ante- rior end, on the basis of the histological evidence given above, may be assumed to be engaged in a process of internal excretion. This
. The Biological bulletin. Biology; Zoology; Marine biology. A STATISTICAL STUDY OF MITOSIS AND AMITOSIS. 225 and arranged in a reticulate manner, can be seen oozing out into the " body ; These large dorsal cells are continuous with the liver cells. While it may be inferred, from facts to be presented later that the cells in the posterior part of the digestive tract are engaged in the digestion and storage of food materials, those in the ante- rior end, on the basis of the histological evidence given above, may be assumed to be engaged in a process of internal excretion. This assumption gains in validity when we recall that an immense amount of yolk must be metabolized and also that the oesophagus is at the level of the external kidneys. Though many of the outermost cells show signs of " overwork" the disintegration which this brings about is in no sense pathological, since it L D. Fig. 5. A transverse section through the posterior half of a larva in stage VI. Z, lateral; v, ventral; d, dorsal; ventrally and laterally is the comparatively undiffer- entiated entoderm; dorsally are the large liver 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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