. The biology of the Protozoa. Protozoa; Protozoa. 150 BIOLOGY OF THE PROTOZOA microns to great waving sheets of protoplasm almost as long as the entire cell (Fig. 77). They are nsnally found in the peristomial area inside the rows of membranelles or adoral zone and are named pre- oral, endoral, paroral, etc., according to their positions in relation to the mouth (Fig. 78). They are also frequently found in the gullet, a single one, for example, in Paramecium, two in Glancoma, etc., and are used exclusively for food-getting (see Maier, 1903), Schu- berg, 1905, etc.).. Fig. 78. — Diagram of a h
. The biology of the Protozoa. Protozoa; Protozoa. 150 BIOLOGY OF THE PROTOZOA microns to great waving sheets of protoplasm almost as long as the entire cell (Fig. 77). They are nsnally found in the peristomial area inside the rows of membranelles or adoral zone and are named pre- oral, endoral, paroral, etc., according to their positions in relation to the mouth (Fig. 78). They are also frequently found in the gullet, a single one, for example, in Paramecium, two in Glancoma, etc., and are used exclusively for food-getting (see Maier, 1903), Schu- berg, 1905, etc.).. Fig. 78. — Diagram of a hypotrichous ciliate. az, adoral zone of membranelles; c, anal and ventral cirri; e m, endoral membrane; e o, endoral cilia; p m, paroral mem- brane; p c, preoral cilia; p o c, paroral cilia. (From Calkins.) Cirri.— Cirri are the most highly specialized of all the motile organs of ciliates, the most characteristic forms occurring in the Hypotrichida. They are placed more or less definitely on the ventral surface, a group, variable in number, at the anterior end being known as the frontal cirri, a similar group, also variable in number, near the posterior end being known as the anal cirri, while other groups may form caudal cirri, ventral cirri, marginal cirri, etc. (Figs. 78, 79). Cirri are always broader at the base and taper gracefully to a fine point. In cross-section near the base they are either 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, New York, Lea & Febiger
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