PLATE LIX. 



Figures magnified 500 diameters. 



Page. 

 Fig. 1. Staurastrum Brasiliense, . . . 160 



Figs. 2, 3. " " two end views, Florida and New 



Jersey forms, . . .160 



" 4, 5, 6. iStuarastrum eustephanum, Minnesota form, . 161 



" 7, 8. Stadbastrdm cuiteatcm, front and end views, . . 162 



" 9, 10. Statjrasteum eustephanhm, (typical form), 161 



Fig. 11. " " (elongated processes), . 161 



Figs. 12, 13. Staurastrum puectgeruit, end and front views, . . 161 



Fig. 14. " " a variety, . 165 



Figs. 15, 16. Staubatrum furcatum, variety, . . 165 



