. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 51. Peridinium anylicuiii G. S. West. A, ventral view; B, dorsal view; C, apical view;D, antapical view; E, thin-walled cyst within old wall; F, escaped cyst; G and H,division of escaped cyst; /, escape of an elongated cyst from old wall; J, escape ofnaked motile individual from cyst; A and L, divisions of naked motile state. All x fig. C: 1—3, apical plates; 1—7, precingular plates; 1, anterior intercalary plate. finds very abrup

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 51. Peridinium anylicuiii G. S. West. A, ventral view; B, dorsal view; C, apical view;D, antapical view; E, thin-walled cyst within old wall; F, escaped cyst; G and H,division of escaped cyst; /, escape of an elongated cyst from old wall; J, escape ofnaked motile individual from cyst; A and L, divisions of naked motile state. All x fig. C: 1—3, apical plates; 1—7, precingular plates; 1, anterior intercalary plate. finds very abrupt changes involving a whole complex of fundamentalcharacters, so that in one, or at most in two generations of asexually-produced individuals the descendants differ profoundly from the ancestraltype. The fact that the mutating chains have been seen so rarely incomparison with the vast numbers of normal chains which have been 72 Peridinieae observed, coincides with observations on mutations in other organisms, and. I

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni