. An elementary course of practical zoology. Zoology. REPRODUCTIVE ORGANS 19.^ their peculiar form, they are cells, the I'od-like portion, or head, being the nucleus, and the delicate vibratile part, or tail, the protoplasm. In the breeding season the cavities of the testes are full of sperms floating in a fluid. Thus the spermatic fluid, like the blood, owes its distinctive character to the cells floating in Fig. 62.—A, transverse section of a crypt of the spermary. B, stages in the development of the sperms. Sf. bundles of sperms; germinal epithelium. (A, after Blomfield; B, after
. An elementary course of practical zoology. Zoology. REPRODUCTIVE ORGANS 19.^ their peculiar form, they are cells, the I'od-like portion, or head, being the nucleus, and the delicate vibratile part, or tail, the protoplasm. In the breeding season the cavities of the testes are full of sperms floating in a fluid. Thus the spermatic fluid, like the blood, owes its distinctive character to the cells floating in Fig. 62.—A, transverse section of a crypt of the spermary. B, stages in the development of the sperms. Sf. bundles of sperms; germinal epithelium. (A, after Blomfield; B, after Howes). Eeproductive Organs of the Female.—Each ovary (Fig. 4, /. ovy), is a greatly folded sac with thin walls and a large cavity, divided up by partitions. It is attached to the dorsal body-wall by a fold of peritoneum. As we have seen (p. 23), its surface is studded all over with little rounded projections, each of which is an ovisac, and contains an egg. The egg or ovum (Fig. 63) is a large globular cell with a clear nucleus (nu) containing numerous nucleoli {nu), and having its protoplasm {pr) full oi yolk-granules—grains of proteid material which serve as nutriment for the growing 0 2. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
