. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 97. A—F, Scourfieldia complanata G. S. West ; A — C, three individuals after stainingwith iodine; ch, chloroplast; », nucleus; v, vacuoles (2?); A and B, seen from the front;C, side view showing compression of cell; I), side view showing resting position of cilia inliving cell; E, diagram to show direction and nature of movements ; F, diagram to showcross-section of cell and nature of chloroplast. G and H, Pteromonas Chodati Lemm., front
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 97. A—F, Scourfieldia complanata G. S. West ; A — C, three individuals after stainingwith iodine; ch, chloroplast; », nucleus; v, vacuoles (2?); A and B, seen from the front;C, side view showing compression of cell; I), side view showing resting position of cilia inliving cell; E, diagram to show direction and nature of movements ; F, diagram to showcross-section of cell and nature of chloroplast. G and H, Pteromonas Chodati Lemm., frontand side views. I and J, Pteromonas anqulosa (Carter) Lemm., front and side — E, x2000; G—J, x 800. Family Volvocaceae. This is much the largest family of the Volvocinege, and includes bothunicellular and colonial forms. The most important unicellular genus isChlamydomonas. The colonies consist of motile coenobia of Chlamydomona-dine cells, generally embedded in a mucilaginous envelope through which thecilia project. The cells possess a distinct cell-wall, which in most cases is in 1 Consult Hazen (99); Wille (03); and W. B. Grove,
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