. The biology of the protozoa. Protozoa; Protozoa. 128 BIOLOGY OF THE PROTOZOA nemes but coordinating fibrils. It is conceivable, moreover, that myonemes in a generalized condition may be both coordinating and contractile in function. In some cases, however, two distinct sets of fibrils have been observed, one of which is interpreted as contractile, the other as conductile. Thus Xeresheimer described "myophanes" and "neurophanes" in Stentor coeruleus, and Clima- costomum virens, the former extending the entire length of the body, the latter only from the base to the center
. The biology of the protozoa. Protozoa; Protozoa. 128 BIOLOGY OF THE PROTOZOA nemes but coordinating fibrils. It is conceivable, moreover, that myonemes in a generalized condition may be both coordinating and contractile in function. In some cases, however, two distinct sets of fibrils have been observed, one of which is interpreted as contractile, the other as conductile. Thus Xeresheimer described "myophanes" and "neurophanes" in Stentor coeruleus, and Clima- costomum virens, the former extending the entire length of the body, the latter only from the base to the center (Fig. 71). On a priori grounds it would seem that, as Yocom points out, Neres- ,11'^i %!-'-. Fig. 71. â Climacosiomum sp. To show neurophanes (NE) and myophanes (MY). (Original.) heimer made an unfortunate application of his two terms, his neurophane fibers, for example, to which lie ascribes a transmitting function, being situated in the least advantageous position for the functions of irritability or conductility, Jennings having shown that the first and most strongly marked reactions to certain stimuli in ciliates appear in the anterior region, a result confirmed by Alverdes (1922). The more recent observations of Sharp, Yocom, and Taylor, all from Kofoid's laboratory, afford more striking evidence of specific conducting or coordinating fibrils in ciliates, although not connected. 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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