. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ENTRANCE POINT OF SPERM AND CLEAVAGE 65 Such reasoning might have led one to infer that a dexiotropic third cleavage in Cumingia means that the second cleavage must have been leiotropic. A study of preserved eggs in the anaphase of the second division gave no indication of a spiral arrangement of the spindle. The spindles in the CD- and AB-cells appear to lie in the same hor- izontal plane (Fig. 4, a, b, c, d~), instead of being tilted in opposite directions, as has been described for other eggs at this division (Mead, Conkl
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ENTRANCE POINT OF SPERM AND CLEAVAGE 65 Such reasoning might have led one to infer that a dexiotropic third cleavage in Cumingia means that the second cleavage must have been leiotropic. A study of preserved eggs in the anaphase of the second division gave no indication of a spiral arrangement of the spindle. The spindles in the CD- and AB-cells appear to lie in the same hor- izontal plane (Fig. 4, a, b, c, d~), instead of being tilted in opposite directions, as has been described for other eggs at this division (Mead, Conklin). Of course it is possible that the tilting of the spindles in the Cuniingia egg is too slight to be visible, but nevertheless it is 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
