. Fresh-water biology. Freshwater biology. 114 (113) Without an undulating membrane in the peristome. Body purse- shaped, oblique in front; peristome funnel-shaped, open- ing on the ventral side by a slit reaching as far as the middle of the body. Membranellae on the left side of the peristome Bursaria Muller. Representative species. Bursaria truncatella Muller 1786. Nucleus band-like; contractile vacuoles numerous. Length soo to 700 li. Pond water. Fig. 511. Bursaria truncatella. cv, contractile vacuole; macn, macronucleus- X 35. (After Kent.) 115 (106) Peristome confined to the anterior bord
. Fresh-water biology. Freshwater biology. 114 (113) Without an undulating membrane in the peristome. Body purse- shaped, oblique in front; peristome funnel-shaped, open- ing on the ventral side by a slit reaching as far as the middle of the body. Membranellae on the left side of the peristome Bursaria Muller. Representative species. Bursaria truncatella Muller 1786. Nucleus band-like; contractile vacuoles numerous. Length soo to 700 li. Pond water. Fig. 511. Bursaria truncatella. cv, contractile vacuole; macn, macronucleus- X 35. (After Kent.) 115 (106) Peristome confined to the anterior border of the body, with its plane nearly at right angles to the longitudinal axis of the body 116 116 (119) Posterior end not produced into a tail-like process. . .117 117 (118) Body purse-shaped, slightly flattened, anterior end oblique. Peristome enclosing most of the anterior end of the body. Climacostomum Stein. 118 (117) Body funnel-shaped when extended, fixed or free-swimming, some- times enclosed in a jelly-hke lorica. Peristome, the ante- rior expanded surface with a spiral row of strong cUia around its border; the left end of the spiral being the lower, leading into the mouth and short pharynx. Surface finely cihate sometimes bearing, in addition, long slender bristles. Stentor Oken. Representative species. Stentor polymorpkus Muller 1786. Body usually containing a cortical layer of chlorophyl granules. Nucleus moniliform. Length, extended, 1200 ^. Among aquatic plants and in infusions. Sometimes found in gelatinous masses on leaves and roots of water plants. Another fresh-water form, Stentor coeruleus Ehrenberg, blue in color, is also Fig. 512. Stentor polymorpkus. cv, contractile vacuole; macn, macronucleus. X 30. (After Kent.) iig (116) Posterior end produced into a tail-like process; anterior region helmet-Hke, rounded anteriorly with a free posterior margin. Mouth ventral in a ciliated groove. Cilia extending from the mouth in a spiral across the anterior bo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
