. The Biological bulletin. Biology; Zoology; Marine biology. Vol. XIII. June, igoy. No. i. BIOLOGICAL BULLETIN PATHOLOGICAL AMITOSIS IN THE FOOD-OVA OF O. C. GLASER. In his paper entitled " Amitosis in the Embryo of Fasciolaria " ('04), Professor H. L. Osborn has described the nuclear changes occurring in the food-ova with which the embryos of Fasciolaria tidipa gorge themselves at a certain stage of their development ('05). Since the appearance of Child's paper ('07) will no doubt stimulate fresh interest in direct nuclear divisions, I have decided to publish this note
. The Biological bulletin. Biology; Zoology; Marine biology. Vol. XIII. June, igoy. No. i. BIOLOGICAL BULLETIN PATHOLOGICAL AMITOSIS IN THE FOOD-OVA OF O. C. GLASER. In his paper entitled " Amitosis in the Embryo of Fasciolaria " ('04), Professor H. L. Osborn has described the nuclear changes occurring in the food-ova with which the embryos of Fasciolaria tidipa gorge themselves at a certain stage of their development ('05). Since the appearance of Child's paper ('07) will no doubt stimulate fresh interest in direct nuclear divisions, I have decided to publish this note on pathological amitosis, particularly as Professor Osborn's description is unsatisfactory. Not only has he conceived an erroneous idea of the structure of the nuclei in question, but he has failed to point out the lesson which they teach, for nuclear divisions which have in common only the prop- erty of being non-mitotic, are for "•.;• that reason not necessarily com- '•••: parable in other respects. The germinal vesicles of the food-ova, placed excentrically in the eggs, surrounded by a zone of cytoplasm comparatively free from yolk granules, are surpris- ingly large. The only regions of these vesicles that stain are the enormous nucleoli in which the chromatic material is located be- tween the bubbles of a fine non-staining froth. Outside of each nucleolus, the nuclear material is composed of minute granules 1 Contributions from the Zoological Department, University of Michigan, No. Fig. 1. Unfragmented germinal ves- icle of food ovum. The large black bodies represent 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
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