. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BEHAVIOR OF CELLS IN FUNDULUS HETEROCLITUS. 227 increased in extent, more striations became visible. The mark- ings appeared to be on the under surface of the cells, that is, farthest from the mesenchyme. The striae were very definite, appearing as longer or shorter dark lines over the cell, varying only slightly in width, and never crossing a cell boundary. The wall between adjacent cells was distinctly double, so that each cell had its own complete investment. This was also clearly seen in a few cases where ectoderm cells
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BEHAVIOR OF CELLS IN FUNDULUS HETEROCLITUS. 227 increased in extent, more striations became visible. The mark- ings appeared to be on the under surface of the cells, that is, farthest from the mesenchyme. The striae were very definite, appearing as longer or shorter dark lines over the cell, varying only slightly in width, and never crossing a cell boundary. The wall between adjacent cells was distinctly double, so that each cell had its own complete investment. This was also clearly seen in a few cases where ectoderm cells had become separated from each other. Frequently one or more striae near the periph- ery of a cell were situated parallel with the cell wall, while the inner ones were more irregular or arranged concentrically with reference to several points in the FIG. i. Camera lucida drawing of an ectodermal cell in process of flattening out during migration; the central mass of thickened cytoplasm bordered by a clear flat region with pale concentric markings. Ocular 5, lens 4 mm. Form and Behavior of Mesenchyme Cells.—The mesenchyme cells grew out from the explant as more or less elongated and separate cells, which later became connected in various ways. Adjacent cells sometimes sent out short broad processes along their sides, which appeared to fuse with each other, forming a reticulum with relatively small intercellular spaces (Fig. 9). Characteristic also of these cells was the projection of their protoplasm into short thread-like processes often giving a prickly appearance to the edge. The prickly processes became converted. 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,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
