. Fresh-water biology. Freshwater biology. CILIATE PROTOZOA (INFUSORIA) 297 203 (204) mdcn-. Without an operculum. Zooid like Thuricola; adherent to the bottom of the lorica in a sessile manner or united by a con- tinuation of the supporting pedicel. Cothurnia Ehrenberg. Representative species Cothurnia plectoslyla Stokes 1885. Lorica curved, two and one-half times as long as broad, finely striate longitudinally, also with transverse markings. Divided posteriorly into two unequal parts by a curved, chitinous partition to which the zooid is attached. Zooid not protruding much beyond the apertur
. Fresh-water biology. Freshwater biology. CILIATE PROTOZOA (INFUSORIA) 297 203 (204) mdcn-. Without an operculum. Zooid like Thuricola; adherent to the bottom of the lorica in a sessile manner or united by a con- tinuation of the supporting pedicel. Cothurnia Ehrenberg. Representative species Cothurnia plectoslyla Stokes 1885. Lorica curved, two and one-half times as long as broad, finely striate longitudinally, also with transverse markings. Divided posteriorly into two unequal parts by a curved, chitinous partition to which the zooid is attached. Zooid not protruding much beyond the aperture when extended; transversely striate. Length of lorica iiofj. Marsh water. Fig. 549. Cothurnia pkctostyla. cv, contractile vacuole; macn, macronucleus. X 250. (After Stokes.) 204 (203) 206 (207) With an operculum of chitin developed beneath the peristome and closing the lorica when the animal is retracted. Pyxicola Kent. Representative species Pyxicola carteri Kent 1882. Lorica subcylindrical, three times as long as broad, anterior margin slightly oblique, walls undulate. Pedicel very short. Zooid extending beyond the aperture. Length of lorica 90 (i. Fresh water. Fig. 550. Pyxicola carteri. X 270. (After Kent.) 205 (198) Lorica decumbent 206 Animal adherent to the posterior extremity of the lorica. Platycola Kent. Representative species Platycola decumbens Kent 1882. Lorica oval, depressed. Zooid extending considerably beyond the aperture, the exserted portion being at right angles to the portion within the lorica. Length of lorica go ii. Fresh water. Fig. S51. Platycola decumbens. X 200. (After Kent.) Animal adherent to one side of the lorica which often has a valvular aperture. Zooid adherent to the margin of the aperture. Lagenophrys Stein. Representative species. . Lagenophrys vaginocola Stein 1851. Lorica elongate with two semilunar, lip-like processes partially closing the aperture. The processes are raised when the zooid is extended and lowered when it is retracted. Zo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
