The book The Protozoa was written by author Calkins, Gary N. (Gary Nathan), B. 1869 Here you can read free online of The Protozoa book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Protozoa a good or bad book?
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It is this myoneme, Entz maintains, which gives the annulate appearance to the bell, and, like a muscle-fibre, it is charac- terized by fine transverse striations. A second circular set is formed by another single fibre, which, however, is confined to the peristome disk, and is located deep in the ectoplasm (Fig. 91, D). This fibre takes only a few spiral turns at the base of the elevated disk and around the edge of the collar, and functions as a sphincter-muscle to close over the disk. Two set...s of longitudinal myonemes complete the muscular system. Of these, the external set, lying between the two circular myonemes, consists of fine fibres running from the peduncle to the THE INFUSORIA 1 79 disk where their course is radial. The largest and most important of all of the myonemes are those forming the fourth set. These are longitudinal muscle-fibres of considerable thickness running from the centre of the disk radially toward the periphery, then continuing down the sides of the bell as far as the ciliary girdle ( Wimperring), where they leave the wall of the body and come together to form the thick muscle-strand of the stalk.
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