PLATE L. 



Figures luagnifled 500 diameters. 



Page. 



Figs. 1, 2. Staukastkum TniaiDUM, front and end views, . , 133 



" 3, 4. Staobastrum grande. front and end views, . 133 



" 5, fi. Staurastrum MAjrscDLUM, front and end views, 133 



" 7,8. Staurastrum magnum, front and end views, . 133 



'• 9, 10. Staurastrum oebiculare, front and end views, . . 132 



" 11,12. Staurastrum muticum, front and end views, . 131 



Fig. 13 " " Var. ellipticum, . . . 132 



Figs. 14, 15. " " Var. minus, ... 131 



