. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 223. Micrasterias Tkomasiana Arch. G. S. West, a, front view of cell;b, end or vertical view, x 315. 360 Conjugate (79) and afterwards by Klebs (85), Schroder (02) and others. In variousspecies of Closterium one end of the cell becomes temporarily fixed and thewhole cell then performs swinging movements with the fixed end as a Fig. 224. Various filamentous types of Desmids. A, Desmidium occidentale W. & G. S. West
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 223. Micrasterias Tkomasiana Arch. G. S. West, a, front view of cell;b, end or vertical view, x 315. 360 Conjugate (79) and afterwards by Klebs (85), Schroder (02) and others. In variousspecies of Closterium one end of the cell becomes temporarily fixed and thewhole cell then performs swinging movements with the fixed end as a Fig. 224. Various filamentous types of Desmids. A, Desmidium occidentale W. & G. S. West. B, D. coarctatum var. cambricum W. West. C and D, Gymnozyga moniliformis Ehrenb.; C, single cell; D, dividing cell. E—G, Phymatodocis Nordstedtiana Wolle. H, Phy. irregular isScbmidle. I, Spondylosium ellipticum W. & G. S. West. J—L, Spheerozosma excavatumEalfs ; K and I/, zygospores. M, Spondylosium secedens De Bary. N, Spheerozosma granu-latum Roy & Biss. var. trifjranulatum W. & G. S. West. O, Spondylosium rectangular e(Wolle) W. & G. S. West, a, front view; b, vertical or end view; c, side view; d, basal viewof semicell. A and B, x 333; (7—0, x 433. Sooner or later the other pole becomes similarly attached and furtheroscillatory movements are carried out. Sometimes, as Stahl showed inCL moniliferum, the cell swings completely over through 180° and then Desmidiacese 361 becomes attached by the other pole, the movement being repeated. Thisreversal of position occupies
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