. Fresh-water biology. Freshwater biology. Fig. 274 6 (s) Body smooth, without spicules. . 7 (8) Body usually enclosing symbiotic bacteria. Representative species. Large size. Nuclei many. Pelomyxa Greeff. Pelomyxa palustris Greeff 1870. 8(7) 9(10) 10(9) II 12 (14) (13) A very large form moving slowly by broad extensions of the ectoplasm. Endoplasm enclosing sand, brilliant corpuscles and bacteria; with numerous vacuoles in the ecto- plasm. Nuclei may number looo or more. Habitat ooze of ponds and sphagnous swamps. Maximum length 2000 m. P. carolinensis Wilson, described in American Naturalist
. Fresh-water biology. Freshwater biology. Fig. 274 6 (s) Body smooth, without spicules. . 7 (8) Body usually enclosing symbiotic bacteria. Representative species. Large size. Nuclei many. Pelomyxa Greeff. Pelomyxa palustris Greeff 1870. 8(7) 9(10) 10(9) II 12 (14) (13) A very large form moving slowly by broad extensions of the ectoplasm. Endoplasm enclosing sand, brilliant corpuscles and bacteria; with numerous vacuoles in the ecto- plasm. Nuclei may number looo or more. Habitat ooze of ponds and sphagnous swamps. Maximum length 2000 m. P. carolinensis Wilson, described in American Naturalist, Vol. 34, p. 535, is apparently without symbiotic bacteria. Fig. 275. Pelomyxa palustris. X 25. (After Penard.) Body not enclosing symbiotic bacteria. .... 9 Ectoplasmic membranes produced between the pseudopodia. Hyalodiscus Hertwig and Lesser. Representative species. Hyalodiscus rubicundus H. and L. 1874. Body discoidal, moving by extending thin sheets of ecto- plasm which are penetrated by ray-like pseudopodia. En- doplasm reddish-yellow in color enclosing numerous vacuoles and one or more nuclei. Habitat ooze of ponds, not common. Size 40 to 60 /I. Fig. 276. Hyalodiscus rubicundus. X 315. (After Penard.) Ectoplasmic membranes not produced between the pseudopodia. Amoeba Ehrenberg . 11 Pseudopodia sharply distinguished from the body 12 Pseudopodia lobe-like. ... . Amoeba proteus Leidy 1878. Very changeable in form, usually with numerous pseudo- podia. The nucleus is always single, oval and of large size. Contractile vacuoles one or more. Habitat both stagnant and clear water. Size, one of the largest species of the genus; may reach 300 ji or more when extended. Fig. 277. Amoeba proteus, X 100. (Original from a prepaxation.). 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 Ward, Henry Baldwin, 1865-1945;
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
