214 WISCONSIN PHYTOPLANKTON 



PLATE 85. 



All figures x 600. 



Page 



Figs. l-r!. Arthrodesmus suhulatus var. Nordstedtii var. uov 127 



Fig. 4. Arthrodesmus micliiganensis Johns 128 



Fig. 5. Arthrodesmus phimus Turn 128 



Figs. 6-8. Arthrodesmus constrictus G. M. Smith 129 



Figs. 9-12. Arthrodesmus Balfsii W. West 129 



Figs. 13-17. Arthrodesmus EaJfsii var. Brebissonii (Racib.) comb, nov loO 



Fig. 18. Arthrodesmus quiriferus W. & G. S. West 131 



Figs. 19-22. Arthrodesmus incus (De Breb.) Hass 131 



Figs. 23-26. Arthrodesmus incus var. extensus Anders 132 



Figs. 27-29. Arthrodesmus incus var. praelongus var. nov 132 



