. The biology of the protozoa. Protozoa; Protozoa. 552 BIOLOGY OF THE PROTOZOA processes of the capsule are regarded by Doflein as supports in floating, evidence for which is given by Kofoid's observation of these spores in Fig. 221.—Spores of Actinomyxida. ^4, Hexaetinomyxon psammoryctis, after Stole.; B, Sphaeractinomyxon stolgi; C, Triactinomyxon ignotum; D, same, spore-bearing part enlarged, after Leger; E, Synactinomyxon tubificis. (After Caullery and Mesnil.) Order 3. Microsporidia Balbiani. Probably because of their minute size the organisms included in this Order are incompl
. The biology of the protozoa. Protozoa; Protozoa. 552 BIOLOGY OF THE PROTOZOA processes of the capsule are regarded by Doflein as supports in floating, evidence for which is given by Kofoid's observation of these spores in Fig. 221.—Spores of Actinomyxida. ^4, Hexaetinomyxon psammoryctis, after Stole.; B, Sphaeractinomyxon stolgi; C, Triactinomyxon ignotum; D, same, spore-bearing part enlarged, after Leger; E, Synactinomyxon tubificis. (After Caullery and Mesnil.) Order 3. Microsporidia Balbiani. Probably because of their minute size the organisms included in this Order are incompletely known and many points of structure and of life history are still unknown or controversial. They are practically all cell parasites which enter the host by way of the digestive tract from which they may spread to all tissues of the body, causing epidemics not only in fish but, economically more important, costly epidemics in silkworms (Nosema bombyces Naeg.) and honey bees (Nosema apis Zander). Pseudopodia and ameboid movement are rarely observed (Nosema marionis Thel). Inter- mediate hosts are unknown. Agamous reproduction is well established through the observa- tions of many investigators. The agametes are small, uninucleate, and usually with indefinite outlines which scarcely delimit them from the host cell protoplasm; they may have one or several nuclei, and multiply actively by simple division resulting frequently in chain formation through successive nuclear divisions and delayed cell division (Fig. 222). As a result of such agamous reproduction all of the tissues of the host may become infected and myriads of. 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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