. Fresh-water biology. Freshwater biology. CILIATE PROTOZOA (INFUSORIA) 295 igi (192) Bodies bell-shaped, usually transversely striated; peristomal disk broad. Stalk containing a canal but no muscle. Epistylis Ehrenberg. Representative species. . Epistylis flavicans ^hrenhtrg iS^o- The species may be distinguished by the fact that the stem is hollow throughout except the joints which are solid. Another peculiarity is the curvature which each limb makes as it leaves the point of bifurcation in the dichotomously branching system. Five or six circles of strong cilia about the disk. Bodies usually
. Fresh-water biology. Freshwater biology. CILIATE PROTOZOA (INFUSORIA) 295 igi (192) Bodies bell-shaped, usually transversely striated; peristomal disk broad. Stalk containing a canal but no muscle. Epistylis Ehrenberg. Representative species. . Epistylis flavicans ^hrenhtrg iS^o- The species may be distinguished by the fact that the stem is hollow throughout except the joints which are solid. Another peculiarity is the curvature which each limb makes as it leaves the point of bifurcation in the dichotomously branching system. Five or six circles of strong cilia about the disk. Bodies usually pale yellow in color. Nucleus band-like, curved. When old the stalk loses its rigidity and the colony falls down in a tangled mass. The same decumbent condi- tion of a normal, upright colony may be produced by removing its customary food supply. Conjugation of free-swimming microgametes with attached macroga- metes is common. Length of zooids 200 to 350 ti. At- tached to leaves, sticks, stones, etc., in running streams or fresh-water pools. Fig, 544. Epistylis Jlavicans. macg, macrogamete; mxcg, microgamete. X 25. (After Kent.). 192 (191) Bodies elongate-ovate; peristomal disk not broad, elevated a con- siderable distance . Opercularia Stein. Representative species. . Opercularia plicatilis Stokes 1884. Bodies elongate-ovate, smooth, soft and flexible, about three times as long as broad. When contracted, zooids are thrown into transverse folds posteriorly and bear longitudinally plicate, snout-like projections in front. Protoplasm enclosing green corpuscles. Ciliary circles two. Stalk rigid, striate longitudinally. Zooids in sessile groups of from ten to twenty. Length of body 250 li. Height of colony mm. At- tached to plants in pond 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 Ward, Henry Ba
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
