. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRYSTAL ORIENTATION IN SEA URCHIN 405. D FIGURE 1. A. Light micrograph of Clorox-treated test showing curved rows of plates, X2. B. Light micrograph of spine showing the basal portion, milled ring and tapered shaft, X5. C. Scanning electron micrograph of spine showing concave base, X25. D. Light micrograph of test showing double row of ambulacral plates, each pierced by seven pairs of pores. Also apparent are the mamelons that accept the spine, X10. E. Scanning electron micrograph of base of spine showing trabecular componen
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRYSTAL ORIENTATION IN SEA URCHIN 405. D FIGURE 1. A. Light micrograph of Clorox-treated test showing curved rows of plates, X2. B. Light micrograph of spine showing the basal portion, milled ring and tapered shaft, X5. C. Scanning electron micrograph of spine showing concave base, X25. D. Light micrograph of test showing double row of ambulacral plates, each pierced by seven pairs of pores. Also apparent are the mamelons that accept the spine, X10. E. Scanning electron micrograph of base of spine showing trabecular components between the longitudinal columns, X210. the wedges are smooth and rounded and appear as longitudinal columns in side view (Fig. 1C, E). The number of columns on a single mature spine ranged from 40 to 60, and the number frequently increased from the milled ring to the tip of a spine. In transverse section, the increase was seen as new radii (Fig. 2A). In the present study, the wedges forming the columns were loci for observations of etch figures and decorated crystals. 2. Etch figures and decorated crystals on the spine. Etch figures created by treating spines with dilute acid are shown in Figures 2B, C, D. Figure 2B is a lateral view showing identical cleavage directions on the two columns when viewed from the same perspective. Figures 2C, D show etch figures of two wedges on a cross section of a spine located in regions I and II, respectively, of Figure 2A. On each wedge, three cleavage faces are evident. The faces are parallel in the two wedges even though they occupy different positions. 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
Size: 1704px × 1467px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
