. The biology of the Protozoa. Protozoa; Protozoa. 320 BIOLOGY OF THE PROTOZOA with which they have most affinities, then the classification of the Hehozoa is simple. The division into orders following Hertwig and Lesser (1874) is based upon the absence or the nature of the skeleton 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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