. Die biologische Bulletin. Biologie; Zoologie; Biologie; Meeresbiologie. 236 WILLIAM R. ECKBERG. Abbildungen 18-19. Abbildung 18. Schnitt durch die Apikalen Orgel mit Mikrovilli (MV) und Zilien (C). Bildeinsatz: drei basalen Stellen können in einer Zelle des apikalen Orgel gesehen werden (BB, Pfeile). Scale=1.0 urn. Abbildung 19. Höhere Vergrößerung Electron Micrograph des apikalen Organzellen Übersicht basale Gremien (BB), kortikale Granulat (CG), und Golgi-apparat (G). Maßstabsbalken = 2,0 in der unbefruchteten Eizelle, die hyaloplasm wurde in der Spindel Region und ausgeschlossenen Strukturen wie Mitochondrien, Eigelb, Lipid und Kortikalen

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 236 WILLIAM R. ECKBERG. FIGURES 18-19. Figure 18. Section through the apical organ showing microvilli (MV) and cilia (C). Inset: three basal bodies may be seen in one cell of the apical organ (BB, arrows). Scale bar = 1.0 urn. Figure 19. Higher magnification electron micrograph of apical organ cells showing basal bodies (BB), cortical granules (CG), and Golgi apparatus (G). Scale bar = 2.0 In the unfertilized egg, the hyaloplasm was in the spindle region and excluded structures such as mitochondria, yolk, lipid, and cortical granules (ectoplasmic defect of Lillie, 1906). After fertilization, mitochondria moved into the area in abundance, although it still contained little yolk or lipid. The structure of the hyaloplasm persisted throughout cleavage and gastrulation, although its position in the embryo changed. In accordance with previous reports (Lillie, 1902, 1906, 1909), the hyaloplasm was at the interior of the cleaving egg and eventually moved to more superficial regions. In the trochophore, the hyalo- plasm was mostly in the ectoderm. The only change in the egg cortex upon fertilization was the appearance of a perivitelline space. This was not due to cortical granule breakdown, because the cortical granules persisted to the trochophore. Humphreys (1967) reported a similar situation in Mytilus. The endoplasm was not distinct from the ectoplasm during early development. At first cleavage, the endoplasm was peripheral and completely enclosed the hyaloplasm. Endoplasm filled the polar lobe. This contradicts Lillie's (1906) report that the polar lobe is primarily ectoplasmic. Whitaker and Morgan (1930) also. 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 work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Labor

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