. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 142 O. C. GLASEK. furthest away from the nucleus are the smallest, and finally only minute scattered granules can be seen where one cell abuts upon another. The mouth (;«///.) is nearly perpendicular to the antero-poste- rior axis of the body. On each side of it are two pear-shaped patches of highly vacuolated ectoderm [which I described ('04) as early stages of the external kidneys, two organs which in hv m t k. i bv I'ic,. 2. Pre-cannibal larva of Fasciolaria ; , body vesicle; , external kidney; , head vesic
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 142 O. C. GLASEK. furthest away from the nucleus are the smallest, and finally only minute scattered granules can be seen where one cell abuts upon another. The mouth (;«///.) is nearly perpendicular to the antero-poste- rior axis of the body. On each side of it are two pear-shaped patches of highly vacuolated ectoderm [which I described ('04) as early stages of the external kidneys, two organs which in hv m t k. i bv I'ic,. 2. Pre-cannibal larva of Fasciolaria ; , body vesicle; , external kidney; , head vesicle; mac., macromere ; /nt/i., mouth. Zeiss D obj. 2 oc. Drawn by Mr. Carl Kellner. Fasciolaria reach surprising proportions and probably take a most active part in the excretion of waste products. The cells of the excretory organs differ from the ordinary ectoderm cells chiefly in [the great size of their vacuoles and nuclei. They resemble at this stage the ordinary ectoderm in in the comparative indefiniteness of their boundaries, which curiously enough are perfectly distinct at earlier as well as at later stages of development. This disappearance and subsequent reappearance of cell boundaries is due I believe to changes in. 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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