. The Protozoa. Protozoa. 58 THE PROTOZOA side to side, or through the continuous division of the cells in one plane (Fig. 27). Many intermediate stages between simple binary division and spore- formation show that the latter method of reproduction was probably derived from the former. When simple division takes place within Fig. 27. — Eiermocystis palymorpha Leg., a cate- noid colony of Gregarin- ida. [WAS1ELEWSKY.]. Fig. 28. — Exogenous budding in Ephelota Butschliana Ishik. [From a Preparation.] The macronucleus (N) is continued into the four daughter- cells, which appeared first as minute
. The Protozoa. Protozoa. 58 THE PROTOZOA side to side, or through the continuous division of the cells in one plane (Fig. 27). Many intermediate stages between simple binary division and spore- formation show that the latter method of reproduction was probably derived from the former. When simple division takes place within Fig. 27. — Eiermocystis palymorpha Leg., a cate- noid colony of Gregarin- ida. [WAS1ELEWSKY.]. Fig. 28. — Exogenous budding in Ephelota Butschliana Ishik. [From a Preparation.] The macronucleus (N) is continued into the four daughter- cells, which appeared first as minute buds. a cyst, it not unfrequently happens that each of the daughter-cells divides again, thus forming four daughter-cells within the cyst (some Mastigophora and Sporozoa). Again, as many as eight or sixteen may be formed in the same way, and from this it is not a great step- to the method of reproduction by spore-formation, where a great number of young individuals are produced at one time. Another modification of simple division is the process of budding. 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. New York, The Macmillan company; London, Mamcillan & co. , ltd.
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