. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . -ep. - -r B Fig. 57. Navicula (§ Pinnularia) riridinKiitz. A, girdle view; B, valve , epivalve; hi/., hypovalve; c., costas;, central nodule; , terminal no-dule; r., raphe. x 800 (after Pfitzer). Structure of girdle 85 bands occurs in Rhizosolenia,.m which genus the girdle view is the normalaspect presented by the diatom. In fact, the great elongation of the girdlerenders it almost impossible to obtain a view of the valv

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . -ep. - -r B Fig. 57. Navicula (§ Pinnularia) riridinKiitz. A, girdle view; B, valve , epivalve; hi/., hypovalve; c., costas;, central nodule; , terminal no-dule; r., raphe. x 800 (after Pfitzer). Structure of girdle 85 bands occurs in Rhizosolenia,.m which genus the girdle view is the normalaspect presented by the diatom. In fact, the great elongation of the girdlerenders it almost impossible to obtain a view of the valve-face becausethe diatom will not rest on that face. Similar elongated girdles occur inthe genera Guinardia, Attheya, Peragallia, and other centric diatoms. The girdle is also complex in the freshwater Eupodiscus lacustris describedby Wille (03) from the Zambesi, and in some of the naviculoid diatoms, suchas Stauroneis Biblos Cleve (92). Intercalary bands arise during, the processof cell-division, being formed immediately after the new valves, the con-necting band being the last-formed segment of the new half-cell. Like the.

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