. Fresh-water biology. Freshwater biology. 280 FRESH-WATER BIOLOGY 82 (81) Body elongate, nearly cylindrical, the anterior extremity truncate and slightly curved; a short, curved seta borne on either side near the anterior end. A long, straight bristle extend- ing from the posterior end. . Loxocephalus Kent. Representative species. Loxocephalus granulosus Kent 1882. Endoplasm granular, mouth on the obhque anterior bor- UMumliii^ujxu/,. der although quite indistinct. Nucleus spherical, central. Contractile vacuole posterior. Length 40 to 70 (i. _ Often abundant among decaying vegetable matter.
. Fresh-water biology. Freshwater biology. 280 FRESH-WATER BIOLOGY 82 (81) Body elongate, nearly cylindrical, the anterior extremity truncate and slightly curved; a short, curved seta borne on either side near the anterior end. A long, straight bristle extend- ing from the posterior end. . Loxocephalus Kent. Representative species. Loxocephalus granulosus Kent 1882. Endoplasm granular, mouth on the obhque anterior bor- UMumliii^ujxu/,. der although quite indistinct. Nucleus spherical, central. Contractile vacuole posterior. Length 40 to 70 (i. _ Often abundant among decaying vegetable matter. Conjugation readily occurs in infusions. Fig. 494. Loxocephalus granulosus. X 375. (After Edmondson.) 83 (80) Like Uronema, but with an anterior, spiral row of long cilia. hexiotricha Stokes. Representative species. . Dexiotricha plagia Stokes 1885. Body about three times as long as broad, bearing minute hemispherical protuberances. Cilia setae-like; a row of flexible setae extending from the margin of the mouth obliquely across the right-hand side of the anterior half of the body. Nucleus subcentral; contractile vacuole posterior. Length 60/n. Pond water. Fig. 49s. Dexiotrkha plagia. X 315. (Alter Stokes.) 84 (79) 8s (86) Without a posterior bristle. 8S Ellipsoidal to elongate, somewhat acute behind. Mouth lateral, surrounded by a furrow which extends backward. Pharynx short with rods. Frontonia Ehrenberg. Representative species Frontonia leucas Ehrenberg 1838. Body elongate-oval, wider anteriorly. Mouth a slit anterior to the middle of the body. Cilia fine, in longitudinal rows. Contractile vacuoles, usually two. Trichocysts numerous. Length 250 to 300 11. Stagnant Fig. 496. Frontonia leucas. V, vacuole. , canal; iV, macronucleus; «, micronucleus; X i6s. (After Calkins.) 86 (85) Ovate, flattened, rounded at each end. Mouth triangular or crescent- shaped, lateral, in front of the middle of the body. Glaucoma Ehrenberg. Representative species. Glaucoma scintillans Ehre
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