. The biology of the protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF THE SARCODINA 457 ment. In Chlamydophrys they form a network as in Allogromia (Fig. 189). The tests are simple, one-chambered structures of widely-varied form, frequently ornamented with spines and processes. The basis of all shells is a pseudochitinous membrane which, in some forms, is greatly thickened and constitutes the test; in other cases foreign particles are cemented to the outside of the chitinous membrane (Difflugia, Centropyxis, etc.), and in still other cases silicious plates are precipitated in the endop
. The biology of the protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF THE SARCODINA 457 ment. In Chlamydophrys they form a network as in Allogromia (Fig. 189). The tests are simple, one-chambered structures of widely-varied form, frequently ornamented with spines and processes. The basis of all shells is a pseudochitinous membrane which, in some forms, is greatly thickened and constitutes the test; in other cases foreign particles are cemented to the outside of the chitinous membrane (Difflugia, Centropyxis, etc.), and in still other cases silicious plates are precipitated in the endoplasm in the vicinity of the nucleus, and deposited on the chitinous membrane in definite patterns charac- teristic of different genera (Euglypha, Quadrula). Reproduction occurs by longitudinal binary division in forms with a soft chitinous membrane, where membranes divide with the soft. *i i. 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, Lea & Febiger
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