. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ll (Chamsesiphon), or produced by the division of the contentsof the mother-cell by three or more sets of division-planes (Xenococcus, Hyella, Dermo-carpa). Order II. Includes all the filamentous filaments consist of a simple row of cells, very rarely naked, and usually 42 Myxophycese enclosed within a sheath, which varies from a hyaline, indistinct envelope toa tough, coloured investment. In some instances severa
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ll (Chamsesiphon), or produced by the division of the contentsof the mother-cell by three or more sets of division-planes (Xenococcus, Hyella, Dermo-carpa). Order II. Includes all the filamentous filaments consist of a simple row of cells, very rarely naked, and usually 42 Myxophycese enclosed within a sheath, which varies from a hyaline, indistinct envelope toa tough, coloured investment. In some instances several rows of cells occurwithin the same sheath. In most of the families heterocysts occur in moreor less abundance, but in the Oscillatoriace* and Camptotrichacere they areabsent. In some genera the filaments are branched, and in others a peculiartype of false branching occurs. Most of the Alga- in this group occurattached to a substratum. The plants multiply by means of hormogones,and more rarely by resting-spores. A. Psilonemateee. Trie-homes1 cylindrical, sometimes narrowed at theextremities, but never gradually attenuated towards the
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