. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METAMORPHOSIS OF CALCAREOUS SPONGE 27. Figure 14. Section of the settled larva of Leucosoleniu laxu. consisting of a pinacoderm (P) and an inner cell mass about 18 h after settlement. Scale bar = 2 /nm. Figure 15. Autophagosome (A) with glutinous granules (G) in the inner cell mass of the settled lai\a i Leucosolenia laxa about 18 h after settlement. Scale bar = 2 Figure 16. Autophagosome (A) with a degenerative rootlet (R) in the inner cell mass of the settled lar\;i nl 'iii uMileiiUi la\a about 18 h after settlem
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METAMORPHOSIS OF CALCAREOUS SPONGE 27. Figure 14. Section of the settled larva of Leucosoleniu laxu. consisting of a pinacoderm (P) and an inner cell mass about 18 h after settlement. Scale bar = 2 /nm. Figure 15. Autophagosome (A) with glutinous granules (G) in the inner cell mass of the settled lai\a i Leucosolenia laxa about 18 h after settlement. Scale bar = 2 Figure 16. Autophagosome (A) with a degenerative rootlet (R) in the inner cell mass of the settled lar\;i nl 'iii uMileiiUi la\a about 18 h after settlement. Scale bar = 1 /urn. loblastulae; therefore, we thoroughly studied the fate of these cells during metamorphosis. Examination of a large number of electron micrographs revealed that the flagellated cells become the three principal cell types of juvenile sponges—that is, pinacocytes. scleroblasts. and choano- cytes. This conclusion is supported by the fact that these three cell types contain glutinous granules, which only the flagellated cells have in the free-swimming larva. This fact shows clearly that the flagellated cells of the coeloblastulae hold multipotency, althoi i:ive been specialized for swimming. Experimental Approaches in future research will indisputably demonstrate the developmental potency of the larval cells. The flagellated cells of coeloblastulae pass through the intermediate stage of dedifferentiation in a settled larva before they differentiate to the cells of a juvenile 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 Bio
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