. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 4. Plates and stereom of the holothurian Psolus chitonoides. (A) Flat plate. Scale: 100 (B) A plate that is becoming a laminated structure with the addition of a new layer. Scale: 100 t*m. (C) Labyrinthic stereom structure in the form of a block. Scale: 100 nm. (D) Higher magnification of a stereom surface. Scale: 10 Travis, 1970; Pucci-Minafra et al., 1972; Pearse and Pearse, 1975; Okazaki and Inoue, 1976). Okazaki and Inoue (1976) give an organic content for the larval spicules of about 1% by weight. Klein and Curre
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 4. Plates and stereom of the holothurian Psolus chitonoides. (A) Flat plate. Scale: 100 (B) A plate that is becoming a laminated structure with the addition of a new layer. Scale: 100 t*m. (C) Labyrinthic stereom structure in the form of a block. Scale: 100 nm. (D) Higher magnification of a stereom surface. Scale: 10 Travis, 1970; Pucci-Minafra et al., 1972; Pearse and Pearse, 1975; Okazaki and Inoue, 1976). Okazaki and Inoue (1976) give an organic content for the larval spicules of about 1% by weight. Klein and Currey (1970) give a value of protein by weight (about 1% by volume) which is close to the for protein in larval spicules given by Okazaki and Inoue (1976). Evidence for a highly oriented microcrystalline structure in echinoderm calcite is also increasing. Polarized light and X-ray diffraction studies (Raup, 1966; Donnay and Pawson, 1969; Nissen, 1969) suggest that echinoderm calcite is a single crystal, but these studies cannot distinguish between a single crystal and a highly ordered microcrystalline construction where all the microcrystals have the same C-axis ori- entation. Fracture studies do not show cleavage planes expected of inorganic crys- talline calcite (Raup, 1966; Nichols and Currey, 1968; Nissen, 1969; Okazaki and Inoue, 1976), and several authors show fractures (Pearse and Pearse, 1975; O'Neill, 1981) or etching (Okazaki and Inoue, 1976) which suggest concentric laminated ordering of microcrystals. Recent studies by O'Neill suggest that when echinoderm. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
