. A course in invertebrate zoölogy : a guide to the dissection and comparative study of invertebrate animals. Zoology; Invertebrates. 22 Marvels of Pond-Life. complete intestinal canal, bnt such an apparatus is now believed not to exist in any of the Infusoria. Food particles, after leaving the oesophagus, are thrust for- ward into the sarcode, or soft flesh, and any cavity thus formed acts as a stomach. The bells or cups are not, as might be fancied from a casual inspection, open like wineglasses at the top, but furnished with a retractile disk or cover, on which the cilia are arranged. Their
. A course in invertebrate zoölogy : a guide to the dissection and comparative study of invertebrate animals. Zoology; Invertebrates. 22 Marvels of Pond-Life. complete intestinal canal, bnt such an apparatus is now believed not to exist in any of the Infusoria. Food particles, after leaving the oesophagus, are thrust for- ward into the sarcode, or soft flesh, and any cavity thus formed acts as a stomach. The bells or cups are not, as might be fancied from a casual inspection, open like wineglasses at the top, but furnished with a retractile disk or cover, on which the cilia are arranged. Their stalks are not simple stems, but are hollow tubes, which in the genus Vorti- cella are furnished with a muscular band, by whose agency the movements are principally made. Some of the Vorticellids will be observed to leave their stalks, having developed cilia round their base, and may be seen to swim about in the enjoyment of individual life. They are also capable of becoming encysted, that is, of secreting a gelatinous Encysted Yorticella, showing the obliteration of special organs by the advancement of the process.—Pritchard. These changes are exhibited in the annexed cuts, which are copied from known authorities. By careful observation of the bodies of Vorticellids, a contractile vesicle may be observed, which appears to cause a movement of fluids, that is probably connected either with respiration or 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 Pratt, Henry Sherring, b. 1859. Boston ; London : Ginn & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
