. A manual of zoology. Zoology. /. RHIZOPOBA: HELIOZOA. 191 Heliozoa possess a silicious skeleton, -which may be a lattice-work sphere (fig. 121), needles radially arranged or placed tangen-. Fio. 121-—ClathruUna eJegans. A, with extended pseudopodia; B, divided into two cysts: G, zoospore; n, nucleus; cu, contractile vacuole. tially. The forms without skeletons are few, but these have the power (fig. 122) of forming silicious envelopes during encystment. Reproduction takes place by divi- sion, and one or both moieties may become swarm spores, , assume an oval form bearing at one pole one
. A manual of zoology. Zoology. /. RHIZOPOBA: HELIOZOA. 191 Heliozoa possess a silicious skeleton, -which may be a lattice-work sphere (fig. 121), needles radially arranged or placed tangen-. Fio. 121-—ClathruUna eJegans. A, with extended pseudopodia; B, divided into two cysts: G, zoospore; n, nucleus; cu, contractile vacuole. tially. The forms without skeletons are few, but these have the power (fig. 122) of forming silicious envelopes during encystment. Reproduction takes place by divi- sion, and one or both moieties may become swarm spores, , assume an oval form bearing at one pole one or two flagella (fig. 121, 0). These swarm spores become widely distributed by the flagella before they resume the spherical shape, lose their flagella and form pseudopodia. It frequently occurs that several Heliozoa of the same .species become connected by jjroto- plasmic bridges, and so form unions of from two to ten individuals. True fer- tilization preceded by a kind of polar- fio gloljule formation has only been ob- served in Actinophrys sol and AcHuosphcBriu»i eichltoriii. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
