. The biology of the Protozoa. Protozoa; Protozoa. SPECIAL MORPHOLOGY AND TAXONOMY OF SARCODINA 333 rise to the pseudopodial network which acts as a trap for the capture of diatoms, cnistacea, rotifers and other smaller objects used as food. In the perforate t\pes pseudopodia are also protruded through the finer pores (foramina) of the shell. One large ^'esicular nucleus is characteristic of both single and many-chambered types. In the latter the nucleus may be confined to the first formed, or inner, chambers, although it may wander throughout the entire organism. In many cases it is replaced
. The biology of the Protozoa. Protozoa; Protozoa. SPECIAL MORPHOLOGY AND TAXONOMY OF SARCODINA 333 rise to the pseudopodial network which acts as a trap for the capture of diatoms, cnistacea, rotifers and other smaller objects used as food. In the perforate t\pes pseudopodia are also protruded through the finer pores (foramina) of the shell. One large ^'esicular nucleus is characteristic of both single and many-chambered types. In the latter the nucleus may be confined to the first formed, or inner, chambers, although it may wander throughout the entire organism. In many cases it is replaced by. Fig. 149.—Diagram to show the mode of origin of the Nodosarine type of Foramini- fera shell. several nuclei, and there is a general tendency throughout the group to form chromidia by multiple division, or fragmentation of the primary nuclei. Reproduction may or may not be accompanied by fertilization phenomena and throughout the group there is a more or less regular alternation of sexual and asexual processes, accompanied in many cases, by morphological evidence of sexual or asexual generation. In its simplest case, asexual reproduction consists of so-called bud- ding division. In Alloc/ronna for example, the protoplasm streams. 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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