i8o Roosevelt Wild Life Bulletin 



Plate 17. Plankton Algae of Palisades Park 



(All figures x 460) PAGE 



Figs. 1-2 Staurastrum curvatum 143 



Pigs. 3-4 Staurastrum megacanthum 144 



Figs. 5-6 Staurastrum trihastiferum 139, 144 



Figs. 7-8 Staurastrum longispinum var. Indentatum 144 



Fig. 9 Staurastrum minnesotense 144 



