PLATE XL VI. 



Figures magnified 500 diameters. 



Pagi . 



. 1 6. 9 ,.urastrum Sebaldi, six aspects, and forms, . 138 



|.-|, r 7 Var. spinosum, . . 139 



- -.1. STAUB \-i BUM PBEl DOSEBAJ I'l. 1:; '-' 



Fig. 10. lurastrum SEBAiiDi, small variety, . . 138 



ii Staurastrum elonoatum, front view, . 130 



.. ]_. cikI \ iew, . I" 1 " 



s. 13, 14. Staurastrum ircuatum, front and end view, 



15 16. i RASTRi M -i bab* i \hm. I'mni and end view, 



17, L8, 19. Si LURASTR1 M MeBJ \M. 



20 21. StATJRASTRUM <.i: M.l.\ i"i:n M. a form, . 131 



Pig. 22. Staurastrum Franconicum, front view, . . !"> 



[39 

 1 10 

 132 



