. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 E. J. BALSER ET AL lu. Figures 20-23. Transmission electron micrographs of the axocoelic duct of an //. grisea larva (20) and a field-collected synaptid auricularia larva (21-13). Figure 20. Longitudinal section through the duct that opens to the exterior via the dorsal pore (dp). Duct cells are cuboidal monociliated epithelial cells that have basal nuclei (nu) and apical microvilli (mv). Scale bar = 2 nm: be. blastocoel; ep. epidermis; lu. lumen of duct. Figure 21. Cells lining the duct lumen (lu) possess numerous apical
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 94 E. J. BALSER ET AL lu. Figures 20-23. Transmission electron micrographs of the axocoelic duct of an //. grisea larva (20) and a field-collected synaptid auricularia larva (21-13). Figure 20. Longitudinal section through the duct that opens to the exterior via the dorsal pore (dp). Duct cells are cuboidal monociliated epithelial cells that have basal nuclei (nu) and apical microvilli (mv). Scale bar = 2 nm: be. blastocoel; ep. epidermis; lu. lumen of duct. Figure 21. Cells lining the duct lumen (lu) possess numerous apical cellular vesicles (ve) and putative lysosomes (ly). Scale bar = 2 ^m; be. blastocoel; ci. cilium; nu. nucleus. Figure 22. Shows apical adhering (ad) and septate (se) junctions. Scale bar = ^m; lu. lumen; mi. mitochondrion. Figure 23. Shows basal tight junctions. Arrowheads indicate areas of membrane contact. Scale bar = ^m; mi. mitochondrion; nu, 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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