. Fresh-water biology. Freshwater biology. 276 FRESH-WATER BIOLOGY 47 (46) Body flattened ventrally, convex dorsally. With a long neck and usually a tail-like prolongation both of which are hyaline. Mouth a slit at the base of the neck, often invisible. Nuclei usually two; contractUe vacuole posterior. Lionotus Wrzesniowski. Representative species. Lionotus wrzesniowshii Kent 1882. i Fig. 479. Lionotus wrzesniowshii, cv, contractile vacuole. X 125. (After Kent.) 48 (35) Mouth usually somewhat posterior, and often with a pharynx; body oval or kidney-shaped. . -49 49 (so) Body completely ciliate
. Fresh-water biology. Freshwater biology. 276 FRESH-WATER BIOLOGY 47 (46) Body flattened ventrally, convex dorsally. With a long neck and usually a tail-like prolongation both of which are hyaline. Mouth a slit at the base of the neck, often invisible. Nuclei usually two; contractUe vacuole posterior. Lionotus Wrzesniowski. Representative species. Lionotus wrzesniowshii Kent 1882. i Fig. 479. Lionotus wrzesniowshii, cv, contractile vacuole. X 125. (After Kent.) 48 (35) Mouth usually somewhat posterior, and often with a pharynx; body oval or kidney-shaped. . -49 49 (so) Body completely ciliated, cylindrical to ovate, rounded posteriorly. Mouth about one-third of the way from the anterior end; pharynx with rods. Nassula Ehrenberg. Representative species. Nassula ornata Ehrenberg 1838. Usually some shade of red or brown in color. Nucleus large, spherical, posteriorly located. Contractile vacuole single. Length 20011. Among Fig. 480. Nassula ornata. In act of feeding. X 325. Conn.) (After • SI • S2 • S3 50 (49) Body not completely cihated; cilia ventral only. . 51 (s6) Body flattened. . 52 (ss) Mouth in the anterior half of the body. 53 (S4) Body with convex dorsal and flattened or slightly concave ventral surface. Pharynx with rods. . Chilodon Ehrenberg. Representative species. . Chilodon citcullulus MuileT 11&6. o The lip-like extension prominent, a groove leading from it to the mouth. Nucleus oval near the inner end of the pharynx. Contractile vacuoles numerous. Length 125 to 200/i. Stagnant water and among algae. Fig. 481. Chilodon cucullulus, cv, contractile vacuole: macn, macronucleus; mic, micronucleus. X no. (After Blochmann.) 54 (53) Body with ridges on dorsal and ventral surfaces, crenate in cross section, pharynx with rods Chilodonopsis Conn. Representative species Chilodonopsis crenvla Conn 1905. Fig. 482. Chilodonopsis crenula. X 335. (After Conn.) 55 (S2) Mouth in the posterior half of the body Opisthodon Stein. 56 (si) Body not flattene
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
