. Outlines of zoology. Zoology. VORTICELLA. 93 This contractile filament, under a high power, may exhibit a fine striation. (A similar striated structure is seen in some Amoebae, Gregarines, spermatozoa, etc., and above all in striped muscle fibres. It seems to be some structural adaptation to contractility.) The bell has a thickened margin, and within this lies a disc-like lid ; in a depression on the left side, between the margin and the disc, there is. Fig. 40.—Vorticella.—After Biitschli. Structure. N., Macronucleus : «., micro-nucleus ; , con- tractile vacuole; m., mouth ; fv., food
. Outlines of zoology. Zoology. VORTICELLA. 93 This contractile filament, under a high power, may exhibit a fine striation. (A similar striated structure is seen in some Amoebae, Gregarines, spermatozoa, etc., and above all in striped muscle fibres. It seems to be some structural adaptation to contractility.) The bell has a thickened margin, and within this lies a disc-like lid ; in a depression on the left side, between the margin and the disc, there is. Fig. 40.—Vorticella.—After Biitschli. Structure. N., Macronucleus : «., micro-nucleus ; , con- tractile vacuole; m., mouth ; fv., food vacuole ; v., vestibule. Encysted individual. 3. Division. Separation of a free-swimming unit—the result of a division. Formation of eight minute units (ing-.\ 6. Conjugation of microzooid (m£~.) with one of normal size. an opening, the mouth, which leads by a distinct passage into the cell. On the side of this passage there is a weak spot, the potential anus, by which useless debris is passed out. The cilia are arranged so as to waft food-particles into the mouth and down the passage. There is a large and horseshoe-shaped macronucleus, and a small micro- nucleus. Food vacuoles and contractile vacuoles are present as 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 Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
