. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 672 F. B. BEIJNINK AND P. A. VOOGT. Figures 1-10. Full-sized contact-autoradiographs of (parts oQ whole-body sections (50 /xm thickness) of specimens of Aslerias rubens. frozen at timed intervals after oral administration of L-['''C(U)]-leucine ( MBq = 10 ^lC\ per animal). Figure 1. Animal sacrificed after one and a half hours. The roof of the pyloric stomach (PS), the five pyloric ducts (PD), and the walls of the rectal caeca (arrows) are distinctly labeled. Note diffuse labeling of the central region of the periviscera
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 672 F. B. BEIJNINK AND P. A. VOOGT. Figures 1-10. Full-sized contact-autoradiographs of (parts oQ whole-body sections (50 /xm thickness) of specimens of Aslerias rubens. frozen at timed intervals after oral administration of L-['''C(U)]-leucine ( MBq = 10 ^lC\ per animal). Figure 1. Animal sacrificed after one and a half hours. The roof of the pyloric stomach (PS), the five pyloric ducts (PD), and the walls of the rectal caeca (arrows) are distinctly labeled. Note diffuse labeling of the central region of the perivisceral coelomic cavity surrounding the stomach. PC: pyloric caeca. Figure 2. Same animal as in Figure 1, section taken more orally. The folds of the cardiac stomach (CS) and the proximal parts of the pyloric caeca (PC) are strongly labeled. Gonads (G) are visible as highly lobulated strands of tissue and display radioactivity predominantly in regions close to the stomach (arrow- heads). Figure 3. Animal sacrificed after four hours. Cardiac stomach (CS) and median ducts (MD) of pyloric caeca are strongly labeled. Note diffuse radioactivity of the central region of the perivisceral coelomic cavity and narrow bands of tracer along the proximal parts of the peritoneal lining of the pyloric caeca (arrows). Figure 4. Same animal as in Figure 3, section taken more orally to show radioactivity in cardiac stomach (CS) and median ducts (MD) of pyloric caeca. Note labeling of lobulated gonad tissue in regions close to the stomach (arrowheads). Figure 5. Same animal as in Figure 3, section of ambulacral region. The body wall, podia (visible in cross-section as grouped circles), and mouth region are 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 L
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