204 WISCONSIN PHYTOPLANKTON 



PLATE 80. 

 All figures x 500. 



Page 



Figs. 1-4. Staurastrum subnudihrachiatum var. incisum var. nov 108 



Fio-s. 5-7. Staurastrum, inconspicuum var. planctonicum var. nov 109 



Figs. 8-10. Staurastrum cerastes Lund HO 



Figs. 11-14. Staurastrum arachne var. curvatum W. & G. S. "West 112 



Figs. 15-18. Staurastrum pentacerum (WoUe) G. M. Smith 112 



Figs. 19-21. Staurastrum pentacerum var. tetraoerum (Wolle) G. M. Smith. 113 



