178 Roosevelt Wild Life Bulletin 



Plate 16. Plaxkio^- Axgae of Paxisades Paek 



(All figures x 460) page 



Fig. I Micr aster as maliahuleshivarensis 143 



Pig. 2 Micraste ias maJmbuleshwarensis var. serridata 138, 143 



Fig. 3 Micrasterias america^ia 143 



Fig. 4 Xanthidhtm antilopaeum var. polymazum 143 



Fig. 5 Xanthidium antilopaeum var. minneapoliense 143 



Figs. 6-7 Xanthidium suhhastiferum var. Johnsonii 143 



Fig. 8 Arthrodesmus incus var. extensus 143 



Figs. 9-10 Staurastrum hrevispinum var. Boldtii 143 



Figs. 1 1— 12 Staurastrum cuspidatum 143 



