. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRYSTAL ORIENTATION IN SEA URCHIN 409. FIGURE 5. Schematic representation of mineral calcite etched and decorated. Cleavage face of native crystal (A) and decorated crystal (D) can be compared with etch pits with smooth sides (B) and stepped sides (C). E. and F. are scanning electron micrographs of etch pits such as indicated in B. and C, respectively. E., XI900, F., X2750. trabecular structure (Fig. 6F). Crystal sectors in region 2 also showed varying c- and a-axes. In regions 3 and 4 of the tubercle (Fig. 6C) and remaining
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRYSTAL ORIENTATION IN SEA URCHIN 409. FIGURE 5. Schematic representation of mineral calcite etched and decorated. Cleavage face of native crystal (A) and decorated crystal (D) can be compared with etch pits with smooth sides (B) and stepped sides (C). E. and F. are scanning electron micrographs of etch pits such as indicated in B. and C, respectively. E., XI900, F., X2750. trabecular structure (Fig. 6F). Crystal sectors in region 2 also showed varying c- and a-axes. In regions 3 and 4 of the tubercle (Fig. 6C) and remaining parts of the plate, the decorated crystals were especially large at the growing tips of the trabeculae, and had ridges which were clearly parallel (Fig. 6D). Orientation of the sample so as to form 120° with all the ridges made it possible to determine that the c-axis was approximately perpendicular to the surface of the plate and further permitted calculation of the a-axes. The relationship between the plate margins (exclusive of the margin with the ambulacral plates) was examined. The difference in angle between the a-axes and the sides ranged from ° to ° with a mean value for 24 observations of ° ± °. The a-axis directions were found. 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
