Text Appearing Before Image: 362 Y. BENAYAHU AND Y. LOYA Text Appearing After Image: FIGURE 7. Embryogenesis of the planula larva of Parerythropodium fulvum fulvum. Bar = 100 . a: an egg without follicular layer, b: first two divisions of the egg. c: young embryos, d: irregular embryos, e: 24 h blastula. f: 48-72 h blastula. g: gastrula, 4 days after fertilization, h: young planula, arrow points to mouth opening, i: mature planula. Planulae structure and behavior Seven days after fertilization the mucus with the mature planulae in it starts to detach from the surface of the colonies and sink near the "mother colony" (Fig. 8d). The mucoid substance starts to degrade, and the larvae begin to move with their cilia. Figure 8e presents a fractured mature planula, where dense ciliary ec-
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