. The Cambridge natural history. Zoology; Zoologia Geral. FIG. 8.—Fission with modified karyokinesis in the Filose Rhizopod En'ibi/ika. A, out- growth of halt' of the cytoplasm, passage of siliceous plates for young shell outwards ; B, completion of shell of second cell, formation of intra-jmcle&T spindle ; C, D, further stages. (From Wilson, after Schewiakoff.) process, though a spindle is constituted within, and chromosomes are formed and split: the division of the nucleus takes place, however, by simple constriction, as seen in the Filose Ehizopod ;jh/pha (Fig. 8). In many Sarcodi
. The Cambridge natural history. Zoology; Zoologia Geral. FIG. 8.—Fission with modified karyokinesis in the Filose Rhizopod En'ibi/ika. A, out- growth of halt' of the cytoplasm, passage of siliceous plates for young shell outwards ; B, completion of shell of second cell, formation of intra-jmcle&T spindle ; C, D, further stages. (From Wilson, after Schewiakoff.) process, though a spindle is constituted within, and chromosomes are formed and split: the division of the nucleus takes place, however, by simple constriction, as seen in the Filose Ehizopod ;jh/pha (Fig. 8). In many Sarcodina and some Sporozoa the nucleus gives off small fragments into the cytoplasm, or is resolved into them; 1 The fact that it is V'V mitotic division that the uixdifferentiated germ-cells produce the "differentiated" tissue-cells of tin- Iwdy of the highest animals, is again irreconcilable with such theories, whose chief advocates have been A. Weis- niaiin and his 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 Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. [London, Macmillan and co. , limited; New York, The Macmillan company
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