. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. *** — ««^\-:. <M. 11 FIGURE 2. A living, globulated nutritive phagocyte in a squash preparation observed by icld microscopy. The single vacuole and cytoplasmic globules of reserve are conspicuous. The scale line is 50 /u. LH,[ KI. ,x A cros^ of acini of a testis from an urchin collected on May 26, 1963. The scale line is 150 I leinatoxylin and eosin. FIGURK 4. The periphery of one of the testicnlar acini of Figure 3. The large nucleus near the base of the germinal epithelium belongs to a primitive spermatog
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. *** — ««^\-:. <M. 11 FIGURE 2. A living, globulated nutritive phagocyte in a squash preparation observed by icld microscopy. The single vacuole and cytoplasmic globules of reserve are conspicuous. The scale line is 50 /u. LH,[ KI. ,x A cros^ of acini of a testis from an urchin collected on May 26, 1963. The scale line is 150 I leinatoxylin and eosin. FIGURK 4. The periphery of one of the testicnlar acini of Figure 3. The large nucleus near the base of the germinal epithelium belongs to a primitive spermatogonium, and the smaller nuclei belong to deglobulated nutritive phagocytes. Several relict spermatozoa are also present. The scale line is 20 /u. I leinatoxylin and eosin. FIGURE 5. I'art of an acinus of a testis from an urchin collected August 8, 1%3. The center of the acinus is at the top of the figure. The scale line is 150 fi. Hematoxylin and cosin. FiGrkF. 6. The periphery of the testicular acinus of Ligure 5. Several trails of spermatids at the top of the figure are proceeding, between the nutritive phagocytes, toward the center of the acinus. Darkly stained spcnnatocyte nuclei occur along the top border of the basal band of germ cells. At the base of the germinal epithelium are several larger nuclei of primitive -permatogonia. Intermediate in structure and position, betueen the primitive spermatogonia and spermatocytes, are maturing spermatogonia. The scale line is 25 /u. Hematoxylin and eosin. FlGl RE 7. \n antoradiogram of the periphery of the testicular acinus of Figure 5. The base of the germinal layer is io\\anl the left. Some primitive spermatogonia, maturing PI i matotionia and spermatoc\ P s are labeled after exposure to tritiatcd thymidine for one hour. The scale line is 25 /u. Xuclcar fast Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illus
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
