. Fresh-water biology. Freshwater biology. 292 FRESH-WATER BIOLOGY 174 (173) Identical with Trichodina, except that the chitinous ring is not denticulate Urceolaria Stein. 175(172) Without a permanent secondary ring of cilia. . 176 176 (177) With two rings of stiff, spinous processes. Hastatella Erlanger. Representative species Hastatella radians Erlanger 1890. Fig. S36. Bastatella radians, macn, macroaucleus. X 500. (After Erlanger.) niscn 177 (176) Without rings of stiff, spinous processes 178 178 (179) Posterior end elongated, usually attached; peristome slightly de- veloped. Ciliated disk
. Fresh-water biology. Freshwater biology. 292 FRESH-WATER BIOLOGY 174 (173) Identical with Trichodina, except that the chitinous ring is not denticulate Urceolaria Stein. 175(172) Without a permanent secondary ring of cilia. . 176 176 (177) With two rings of stiff, spinous processes. Hastatella Erlanger. Representative species Hastatella radians Erlanger 1890. Fig. S36. Bastatella radians, macn, macroaucleus. X 500. (After Erlanger.) niscn 177 (176) Without rings of stiff, spinous processes 178 178 (179) Posterior end elongated, usually attached; peristome slightly de- veloped. Ciliated disk small. . Scyphidia Lachmann. Representative species. Scyphidia fromentellii TLent 1882. Body truncate anteriorly; stalk-Iike appendage longitudinally striated. Length, extended, So ^. On water snails. Fig. 537. Scyphidia fromentellii. cp, contractile vacuole; », nucleus. X 200. (After Kent.) 179 (178) Posterior end not elongated; attached or free. Cylindrical when extended. Ciliated disk small. Gerda Claparede and Lachmann. Representative species Gerda sigmoides Kellicott 1885. Anterior region narrowed, usually curved. Surface finely striated trans- versely. Nucleus not observed. Length, extended, 150 ji. Adherent to fresh-water plants. Fig. 538. Gerda sigmoides. X 160. (After Kellicott.) 180 (171) With a stalk 181 181 (186) Stalk unbranched 182. 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 Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
