. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 1/4 CASWELL GRAVE. as are found in ophiuran plutei are developed, although at one time I mistook the beginnings of the skeletal plates of the adult for such. The anterior end of the larva is produced into a long preoral lobe about which two ciliated rings are developed. The posterior end is enlarged and contains the various internal struc- tures of the larva and developing ophiurid. The mouth is ven- tral and interrupts the third ciliated ring of the larva (numbered 4 in Fig. 5). The fourth ring (5) surrounds the posterior e
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 1/4 CASWELL GRAVE. as are found in ophiuran plutei are developed, although at one time I mistook the beginnings of the skeletal plates of the adult for such. The anterior end of the larva is produced into a long preoral lobe about which two ciliated rings are developed. The posterior end is enlarged and contains the various internal struc- tures of the larva and developing ophiurid. The mouth is ven- tral and interrupts the third ciliated ring of the larva (numbered 4 in Fig. 5). The fourth ring (5) surrounds the posterior end. The dorsal pore is situated at the point indicated by the small x between ciliated rings 3 and 4. As development progresses the preoral lobe diminishes in size until finally it is entirely ab- 3. 4 FIG. 6. Older larva of Ophiura brevispina. Original. The change in position which takes place in the ciliated ring (5) is shown. sorbed. During late larval life a change in the arrangement of one of the ciliated rings also takes place. The ring numbered 5 becomes interrupted on the ventral side and takes on a more definite relation to the mouth (see Fig. 6). In 1900 I found a second ophiuran larva at Beaufort which, in its metamorphosis from the pluteus to the radial form, showed the. 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 Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
