. The study of animal life. Zoology. The Study of Animal Life part m more useful in surrounding minute food particles. To these root- like processes, which are capable of very considerable, often almost constant, change, these Protozoa owe their gen- eral name of Rhizopods. In contrast to the two preceding types which have definite boundaries or "skins," the Rhizo- pods are naked, and their living matter may over- flow at any point. As the Infusorians are for the most part provided with cilia from which flagella differ only in detail, we may speak ' of the type as ciliated; the self-
. The study of animal life. Zoology. The Study of Animal Life part m more useful in surrounding minute food particles. To these root- like processes, which are capable of very considerable, often almost constant, change, these Protozoa owe their gen- eral name of Rhizopods. In contrast to the two preceding types which have definite boundaries or "skins," the Rhizo- pods are naked, and their living matter may over- flow at any point. As the Infusorians are for the most part provided with cilia from which flagella differ only in detail, we may speak ' of the type as ciliated; the self-contained Gre- garines, often wrapped up within a sheath, we may call predominantly encysted; while those forms which are inter- mediate between these two extremes, and ex- hibit outflowing pro- cesses of living matter, are called amoeboid in reference to their most familiar type, the common Amoeba. But though the members of each class are characterised by the predominance of one of the three phases of cell-life, they sometimes pass from one phase to another. Thus the ciliated or the amoeboid units may become Fig. 40.—^A foraminifer {J'olystojtieUa strigillata) with interlacing processes of the living matter flowing out on all sides. Magnified 10 times. (From Chambers's Encyclop,; after Max Schultze.). 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. New York, C. Scribner's sons [printed at the Edinburgh press]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1892
