Plate V. 
Figs. 1a, 1b, le.—Euastrum incurvatum, 
Figs. 2, 3.—Euastrum annulatum. 
' Fig. 4.—Gleocystis vesiculosa, Naeg. 
Figs. 5, 6.—Cosmarium angulatum. 
Fig. 7.—CEdogonium punctato-striatum, De Bary. 
Figs. 8, 9, 10.—Dictyospherium pulchellum, Wood. 
Figs. 11, 12.—Microspora abbreviata, Rabb. 
Figs. 18, 14, 15, 16, 17.—Cosmarium nitidulum, De Not. 
Fig. 18.—Cosmarium venustum, Breb. 
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