. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. 138 MORPHOLOGY OF FERTILIZATION the nucleus. In all four species there is some evidence that the material filling the "cave" is oriented as fibers. These structures of the acrosomal region, as well as all other parts of the sperma-. Fig. 15. Electron microgra


. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. 138 MORPHOLOGY OF FERTILIZATION the nucleus. In all four species there is some evidence that the material filling the "cave" is oriented as fibers. These structures of the acrosomal region, as well as all other parts of the sperma-. Fig. 15. Electron micrographs of thin sections of sea urchin spermato- zoa. (From AfzeUus, Z. Zellforsch., 1955.) Longitudinal sections, A, through head of Strongijlocentrotus droebachiensis and B, through two acrosomal regions of Echinocardium cordatum. tozoon, are completely enclosed within a cell membrane. Afzelius suggests a comparison between the acrosomal particle he ob- served and the particle observed by Dan (1952) in living sper- matozoa of other species of sea 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 American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington


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