. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN SKELETON FORMATION 329 velop in sea water until the formation of the tri-radiate spicules had taken place, before they were transferred into media of the above range of calcium, and the lengths of the spicules in the various media were compared at intervals thereafter. In spite of variation in the details of the apparent skeletal growth, the general trend showed that a high concentration of calcium caused better skeletal growth 80-. FIGURE 9. Apparent skeletal growth following transfer from sea water to media with
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN SKELETON FORMATION 329 velop in sea water until the formation of the tri-radiate spicules had taken place, before they were transferred into media of the above range of calcium, and the lengths of the spicules in the various media were compared at intervals thereafter. In spite of variation in the details of the apparent skeletal growth, the general trend showed that a high concentration of calcium caused better skeletal growth 80-. FIGURE 9. Apparent skeletal growth following transfer from sea water to media with various Ca concentrations. Material: Hcmiccntrotus pulchcrrimns gastrulae. Ordinate : actual lengths of spicules calculated from camera lucida drawings. Abscissa: Ca concentrations of media. Columns with shading indicate initial length of spicules at transfer. Black, dotted and white columns indicate increase in skeletal length during each two hours after transfer at ° C. than sea water for a short time following transfer, but became harmful later on, while low calcium was relatively harmless. The data of one experiment presented in Figure 9 illustrate this tendency. In this case, the length of the skeleton reached during the first two-hour period after transfer increased corresponding to the Ca For the second 4 Maximum increase in skeletal length during the first period was found sometimes in Ca or in Ca or in Ca. In all cases, however, the skeletons formed in Ca-high media were longer than those in sea 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,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
