Plate IX. 
Fig. 1a.—Cosmarium pachydermum. Living frond. 
Fig. 1b,—Cosmarium pachydermum. Side view. 
Fig. 1c.—Cosmarium pachydermum. End view. 
Fig. 2a.—Cosmarium punctulatum. Living frond. 
Fig. 2b.—Cosmarium punctulatum. Empty frond. 
Fig. 2c.—Cosmarium punctulatum. Side view. 
Fig. 2d.—Cosmarium punctulatum. End view. 
Fig. 3a.—Cosmarium Reinschii. Living frond. 
Fig. 3b.—Cosmarium Reinschii. Empty frond. 
Fig. 3c.—Cosmarium Reinschii. End view. 
Fig. 4a.—Cosmarium Regnesii. Living frond, x ——. 
Fig. 4b,—Cosmarium Regnesii. Empty frond, x ——. 
Fig. 4c.—Cosmarium Regnesii. Empty frond, x 1,000. 
Fig. 5a.—Cosmarium quadrum, Living frond. 
Fig. 5).—Cosmarium quadrum. Empty frond. 
Fig. 6.—Euastrum inermius, Wordst. 
Fig. 7¢.—Euastrum cuneatum, var. solum, x 400. 
Fig. 7e.—Euastrum cuneatum, var. solum, x 400. 
Fig. 7d.—Euastrum cuneatum, var. solum, x 400. 
Fig. 8a.—Staurastrum gracile, var. uniseriatum, West. 
Fig. 8b.—Staurastrum gracile, var. uniseriatum, West. 
Fig. 94.—Cosmarium Meneghinii, var. concinnum. 
Fig. 9b.—Cosmarium Meneghinii, var. concinnum. 
