. Text-book of zoology for schools and colleges. Zoology. 48 INVERTEBRATE ANIMALS. their liberation from the body of the parent, are developed into fresh individuals. â . t- j, Epistylis, which is a good example of the fixed Infusoria, may be regarded as essentially similar to Parammcium in its anatomical structure. In place, however, of a single free- swimming organism, we have now a colony of more or less closely related beings, the whole assuming a plant-like form, and being rooted to some solid object. The colonies of Epistylis may not uncommonly be found adhering to the stems of water-pla
. Text-book of zoology for schools and colleges. Zoology. 48 INVERTEBRATE ANIMALS. their liberation from the body of the parent, are developed into fresh individuals. â . t- j, Epistylis, which is a good example of the fixed Infusoria, may be regarded as essentially similar to Parammcium in its anatomical structure. In place, however, of a single free- swimming organism, we have now a colony of more or less closely related beings, the whole assuming a plant-like form, and being rooted to some solid object. The colonies of Epistylis may not uncommonly be found adhering to the stems of water-plants or to the backs of our common water- beetles, and the trained eye readily recognizes them as a grayish-white down or nap. On placing a portion of this under the microscope, we see a number of little oval cups or " calyces " supported upon a branched stem. Each cup con- tains a sarcode-body, essentially the same as Paramcedum in structure, consisting of granular sarcode, with vacuoles, a nucleus, and a contractile vesicle. The end of the cup farthest from the stalk terminates in a rounded aperture, through which there can be protruded a ciliated disk. On one side of this disk is the aperture of the mouth, leading into a kind of gullet, which is also furnished with large vibrating cUia. This, in turn, opens directly into the soft, granular sarcode of the abdominal cavity, which exhibits a constant though slow Fig. 11.âCiliated InftiBoria. a Va(iinicola ; h i<5?<^<orJ/7///<'r/. the Trumpet Animalcule; c Group of VorticelltB; d Detaclied bud of Voriic^lta. A still commoner and equally beautiful example of the Stalked Infusoria is the so-called Bell-auimalcule ( Vorticella Fig. 11, c), which may be found in any stagnant pool attached. 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
