Plate XVII. 
Fig. 1. —Docidium verticillatum, var. ornatum, Borge, n. var., x 390. 
Fig. 1a.—Docidium verticillatum, The lateral protuberance in lateral veins, * 
Fig. 16.—Docidium verticillatum (?), x 740. 
Figs. 2, 2c, 2d.—Docidium horridum, Borge, n. sp. 
- Fig. 3.—Docidium cedematum, Turn. 
Figs. 4a, 4c.—Euastrum verrucosum, var. Wallichianum, Turn. 
Fig. 5.—Docidium cylindricum, Turn. 
Fig. 6.—Staurastrum rectangulare, Borge, n. sp., x 740. 
: Figs. 7a, 7.—Stanrastram bengalense, Turn., x 300. 
Figs. 8, 8a, 8.—Desmidium Baileyi, forma genuina, Nordst. 
Figs. 10a, 10b.—Desmidium Baileyi, forma genuina, Nordst. 
Fig. 9.—Cosmarium excavatum, forma Nordst. 
Figs, lla, 116.—Staurastrum Maskelli, Zurn. 
Figs. 12a, 19.—Staurastrum retusum, Turn. 
