. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . f the hsematochrome,which is found mainly in the resting-stage and is especially an accompaniment ofdiminished vitality, probably lies in its greater stability than chlorophyll, and perhaps alsoin its protective and heat-producing powers (Hazen, 99). The resting-cells develop motile zoogonidia when transferred from old foul water intodistilled water, and from long-continued darkness into light (Freund, 07). The only genera are Sphferella Somm
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . f the hsematochrome,which is found mainly in the resting-stage and is especially an accompaniment ofdiminished vitality, probably lies in its greater stability than chlorophyll, and perhaps alsoin its protective and heat-producing powers (Hazen, 99). The resting-cells develop motile zoogonidia when transferred from old foul water intodistilled water, and from long-continued darkness into light (Freund, 07). The only genera are Sphferella Sommerfeld, 1824 ( = Heematococcus Agardh, 1828)1 andStephanosphaera Cohn, 1852, both of which are perhaps more confined to rain-water poolsthan any other members of the Volvocinese. Note.—It would seem most natural to place the genus Chlorogonium Ehrenberg, 1830(inclus. Cercidium Dang., 1888) with the Sphserellacese, since its ehloroplast is often asindefinite in its limitations as that of Sphserella, and is furnished with from 2 to 5 pyrenoids(or more in Chi. euchlorum); moreover the protoplast contains a number (12—16) of con-tractile
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