216 WISCONSIN PEYTOPLANKTON 



PLATE 31. 



Page 



Figs. 1-2. Lagerheimia ciliata (x 1000) 129 



Fig. 3. Lagerheimia ciliata var. minor (x 1000) 129 



Fig. 4. Franceia ovalis (x 1000) 131 



Fig. 5. Selenastrum gracile (x 1000) 133 



Figs. 6-7. Selenastrum Bibraianum (x 1000) 133 



Figs. 8-10. Selenastrum Westii (x 1000) 133 



