. The biology of the Protozoa. Protozoa; Protozoa. 370 BIOLOGY OF THE PROTOZOA surface but they may encroach on the dorsal surface {c. g., Uron- ychia); they form groups as a rule, named according to their posi- tion, frontal, ventral, anal, and caudal cirri, the number and arrange- ment forming a basis for diagnosis of genera and •• Fig. 161.—Didinium nasutiim capturing and swallowing Paramcciutn caudatum (1 to 6); 8, section of Didinium prior to encystment showing protruded seizing organ with zone of trichocysts and rhizoplasts from the membranulse to the nucleus. (After Calkins.).

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. The biology of the Protozoa. Protozoa; Protozoa. 370 BIOLOGY OF THE PROTOZOA surface but they may encroach on the dorsal surface {c. g., Uron- ychia); they form groups as a rule, named according to their posi- tion, frontal, ventral, anal, and caudal cirri, the number and arrange- ment forming a basis for diagnosis of genera and •• Fig. 161.—Didinium nasutiim capturing and swallowing Paramcciutn caudatum (1 to 6); 8, section of Didinium prior to encystment showing protruded seizing organ with zone of trichocysts and rhizoplasts from the membranulse to the nucleus. (After Calkins.). 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, New York, Lea & Febiger

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Keywords: ., bookauthorcalkinsgaryngarynatha, bookcentury1900, bookdecade1920