. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. Figure 3. Microscopic figures of epididymis in the soft- shelled turtle, Pelodiscus sinensis. A. There were great amount of spermatozoa (S) in the ductus, The simple columna was thin in March 200. B. The heights of epi- thelial cells were at maximum, great amount of sper- matozoa could be seen in the ductus in August 200. maximum (Fig. 2D). By the end of August, when the testicular weights were at their top values, a large amount of spermatozoa gathered in the lumen of the distended seminiferous tu
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. Figure 3. Microscopic figures of epididymis in the soft- shelled turtle, Pelodiscus sinensis. A. There were great amount of spermatozoa (S) in the ductus, The simple columna was thin in March 200. B. The heights of epi- thelial cells were at maximum, great amount of sper- matozoa could be seen in the ductus in August 200. maximum (Fig. 2D). By the end of August, when the testicular weights were at their top values, a large amount of spermatozoa gathered in the lumen of the distended seminiferous tubules (Fig. 2E) and passed into the epididymal canals with the epididymal weights increasing rapidly. In September, spermatogonia! division started to decline with less frequent mitotic figures. The germi- nal epithelium contained mainly spermatides and spermatozoa. At that time, testicular weights began to decrease. By the end of November, testis atrophied highly. And there were only a few spermatozoa remaining in the seminiferous tubules. During hiber- nation, the testis remained atrophied, and the germinal epithelium was composed of Sertoli cells as well as spermatogonia only and was heavily lipoidal (Fig. 2F). Often, there were necrotic cells in the lumen of the seminiferous tubules. 2500 - 2000 • 1000 500. Figure 4. Seasonal variations in plasma testosterone concentration in soft-shelled turtle, Pelodiscus sinensis. Each point represents mean SEM of six values In the ductus of the epididymis, spermatozoa could be recognized in great number in most months. Although in March soon after emergence from hiber- nation epididymal weights were high and their ductus were full of numerous spermatozoa (Figs. 1, 3A). Only in June (after mating period) were there mark- edly less spermatozoa present in the ductus of the epi- didymis. At this time the simple columnar epithelium of epididymis became thin and the nuclei moved toward the basal region of the cells. From the end of July, we
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