. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . chromatophores in each cell, fewest in Centritractus and most in Botrydiopsisand Polychloris. The chromatophores are sometimes discoidal, but at othertimes cushion-like. The cells are uninucleate. Multiplication takes place by cell-division in three directions in Chlorobotrysand Polychloris, and in the former it is the usual method of propagation,motile cells being unknown. In this genus the families of 4, 8 or 16 cellsare often very symmetri
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . chromatophores in each cell, fewest in Centritractus and most in Botrydiopsisand Polychloris. The chromatophores are sometimes discoidal, but at othertimes cushion-like. The cells are uninucleate. Multiplication takes place by cell-division in three directions in Chlorobotrysand Polychloris, and in the former it is the usual method of propagation,motile cells being unknown. In this genus the families of 4, 8 or 16 cellsare often very symmetrical, but beyond this number they become division the contiguous walls of the daughter-cells are at first muchflattened, but afterwards they gradually become more convex. In Pseudo-tetmedron and Chlorobotrys cystsoccur, which on germination produceone or two individuals. In Botrydiopsisa number of spherical aplanosporesare sometimes formed in each mother-cell (fig. 259 B). It is only in Botry-diopsis and Polychloris that zoogonidiaoccur, a large number being formedin each cell (fig. 259 C). Thesezoogonidia possess two or manychroma
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