. A manual of zoology. Zoology. y/ ^ ^JS^ ^^. Fig. 124.—ThdassicoUa pti,ii;ira. In rcnlrc the nucleus with coiled nucleolus, around it central capsule with oil kIoIuiIcs; still outside the extraeapsuluni with vacuoles (extracapsular alveoli), yellow ceils (black) and pseudopodia. contains numerous central capsules, bound together by protoplasmic threads, which form the pseudoijodia on the surface (tig'. 12S). 'A second type is repro- duction by swarm or zoospores, which begins when the nucleus'has divided into hundreds or thousands of daughter nuclei. The contents of the central capsule then d
. A manual of zoology. Zoology. y/ ^ ^JS^ ^^. Fig. 124.—ThdassicoUa pti,ii;ira. In rcnlrc the nucleus with coiled nucleolus, around it central capsule with oil kIoIuiIcs; still outside the extraeapsuluni with vacuoles (extracapsular alveoli), yellow ceils (black) and pseudopodia. contains numerous central capsules, bound together by protoplasmic threads, which form the pseudoijodia on the surface (tig'. 12S). 'A second type is repro- duction by swarm or zoospores, which begins when the nucleus'has divided into hundreds or thousands of daughter nuclei. The contents of the central capsule then divides into as many jiortions as there are nuclei, these become oval and develop two flagella (fig. 126), which soon begin to vibrate so that the central capsule is hlled with a tumultuous ci-owd. With the breaking of the capsular membrane these swarm spores esca])e; here our knowledge of this type ceases. Since in many species there arc macrospores and microspores it is probable that a copulation is 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, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
