. The biology of the Protozoa. Protozoa; Protozoa. 456 BIOLOGY OF THE PROTOZOA in some cases without any. The capsules and threads are invisible or very difficult to see in the living spore (hence crv'ptocysts), but are demonstrable upon treatment with alkalies. The spore capsule is bivalved in some but consists of a single piece in other species. The history of spore-formation agrees in the main with that of the. Fig. 190.—Stempellia magna, life cycle. A, Developmental stages of young amcebula from spore S.; B, stage of nuclear increase; C, formation of sporont; D, formation of a single spore
. The biology of the Protozoa. Protozoa; Protozoa. 456 BIOLOGY OF THE PROTOZOA in some cases without any. The capsules and threads are invisible or very difficult to see in the living spore (hence crv'ptocysts), but are demonstrable upon treatment with alkalies. The spore capsule is bivalved in some but consists of a single piece in other species. The history of spore-formation agrees in the main with that of the. Fig. 190.—Stempellia magna, life cycle. A, Developmental stages of young amcebula from spore S.; B, stage of nuclear increase; C, formation of sporont; D, formation of a single spore, -E, formation of two spores; F, formation of four spores; G, of eight spores; H, development of iminucleated spore with polar capsule. (After Kudo.) Myxosporidia but authorities disagree as to details and convincing proof is yet to be demonstrated. Fertilization processes have been described by Mercier (1908, 1909) whereby two isogametes of Thelo- hania giardi fuse to form the pansporoblast, an observation which has not been confirmed. Autogamous union of nuclei prior to spore-formation and not, as in Myxosporidia in the later sporo-. 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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